{"title":"Flatteners, Reducers \u0026 Correctors","description":"\u003cp\u003eField flatteners, focal reducers, extenders and coma correctors — matched to the telescope they were made for. Part of \u003ca href=\"\/collections\/telescopes\"\u003eTelescopes\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"f-6-3-focal-reducer-for-f-10-sct-visual-or-imaging","title":"F\/6.3 focal reducer for F\/10 SCT, visual or imaging","description":"\u003cp style=\"margin: 0px 0px 1em; padding: 0px; color: rgb(50, 50, 50); font-family: Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.2000007629395px; background-color: rgb(255, 255, 255);\"\u003eAntares' f\/6.3 focal reducer provides a faster f\/6.3 system for imaging or visual use when used with an f\/10 SCT or other compatible telescopes. This filter threads on to the rear cell of your Celestron or Meade SCT telescope. The female end attaches to the rear cell of the telescope. All additional accessories mount onto the exterior\/male threads. The reducer features fully coated optics in an anodized aluminum filter ring with an ergonomic rubber grip. It features a standard male SCT thread (2\" OD, 24 TPI) on one side and a standard SCT female thread on the other.\u003c\/p\u003e\u003cp style=\"margin: 0px 0px 1em; padding: 0px; color: rgb(50, 50, 50); font-family: Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.2000007629395px; background-color: rgb(255, 255, 255);\"\u003eThis is one of our best-selling items, and customers have reported that this product is at least as good as, and probably better than, other leading f\/6.3 focal reducers sold on the market for a lot more. However, even though the imprint on the item states \"Reducer \/ Corrector\" please note that his is a reducer only. It is not a corrector or flattener.\u003c\/p\u003e\u003cp style=\"margin: 0px 0px 1em; padding: 0px; color: rgb(50, 50, 50); font-family: Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.2000007629395px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"margin: 0px; padding: 0px; font-weight: 700;\"\u003eSpecifications:\u003c\/span\u003e\u003c\/p\u003e\u003cul style=\"margin: 0px 0px 1em; padding: 0px 0px 0px 3em; list-style-position: outside; list-style-image: initial; color: rgb(50, 50, 50); font-family: Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.2000007629395px; background-color: rgb(255, 255, 255);\"\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eFocal length = 220mm\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eClear aperture = 40.8mm (1.60\") \u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eLength of male SCT thread = 5mm (0.2\") but this is preceded by an unthreaded part on the eyepiece side making the total length = 8.8mm (0.35\") \u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eLength of female SCT thread = 7.5mm (0.3\") \u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eWeight = 4.3oz.\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eMade in Canada\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antares","offers":[{"title":"Default Title","offer_id":44012347424879,"sku":"SCTFR","price":106.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/focalreducer__62973.png?v=1766547722"},{"product_id":"antares-0-5x-focal-reducer-1-25-visual-or-imaging","title":"Antares 0.5X focal reducer. 1.25\" visual or imaging","description":"\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eVery Useful Reducer. Can Be Used With Any Telescope\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThis superb 0.5x focal reducer has been designed to be used with a wide range of modern CCD cameras and eyepieces. The lens has a female 1.25\" eyepiece filter thread and can be attached to camera and eyepiece nose barrels to achieve a 40% increase in field of view. Basically the lens has the effect of reducing the focal length of the telescope by 40%.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThis super quality dual element lens system features fully anti-reflection coating on all air-glass surfaces for increased contrast.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThe exact degree of focal reduction achieved with any given set-up depends somewhat on the precise position of the FR relative to the imaging chip in the case of CCD cameras and the optics when used with eyepieces. Thus the judicious use of extension tubes and carefully positioned filters can squeeze a great deal of versatility out of these excellent quality observing and imaging aids.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eGreat for visual use and an indispensable CCD imaging aid!\u003c\/p\u003e","brand":"Antares","offers":[{"title":"Default Title","offer_id":44012347523183,"sku":"FR1","price":30.89,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ofr-an-fr1-2__88580.jpg?v=1766547732"},{"product_id":"antares-0-5x-2-focal-reducer","title":"Antares 0.5X 2\" Focal reducer","description":"\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThis superb fully multi-coated double-element focal reducer takes advantage of the latest computer aided design techniques to achieve the highest standards of performance to dramatically increase the field of view (FOV) or imaging scale of your telescope regardless of brand or type.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThe Antares 2 inch 0.5x focal reducer screws directly to the 2 inch filter threads found on eyepieces, camera nose-pieces, extension tubes, star diagonals etc.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThe sheer versatility and performance of this new focal reducer can not be over emphasized! It fits virtually every 2 inch accessory (with filter thread) and effectively halves the focal length of any telescope it is used with (the exact effect of the reducer is dependent on its position in the optical system but an approximate halving of the focal length is typical of the result achieved when used with eyepieces and camera nose-pieces etc).\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eMade in Canada, this excellent optic has a CNC machined aluminium cell with a male 2 inch filter thread.\u003c\/p\u003e","brand":"Antares","offers":[{"title":"Default Title","offer_id":44012606881903,"sku":"FR2-.05","price":41.58,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/s-ofr-an-fr2-2__55084.jpg?v=1766548127"},{"product_id":"explores-scientific-2x-2-focal-extender","title":"Explore Scientific 2x 2-Inch Telecentric Focal Extender","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 2x Focal Extender is a 2-inch telecentric amplifier that doubles the effective focal length of the telescope it is fitted to. The body is 118mm long and 66mm wide, and Explore Scientific's current spec sheet gives its weight as 20 oz (0.57 kg). Explore Scientific describes it as compatible with both 1.25-inch and 2.0-inch eyepiece barrel sizes, for visual observing and for imaging.\u003c\/p\u003e\n\u003cp\u003eThe optics use multiple precision elements in a telecentric arrangement, with EMD coating on the air-to-glass surfaces and edge-blackened elements to hold contrast. Because the design is telecentric rather than a simple negative Barlow, the amplification factor stays at 2x regardless of how far the eyepiece or camera sits behind it.\u003c\/p\u003e\n\u003cp\u003ePractically, that means one focal extender doubles every eyepiece you own. A 20mm becomes a 10mm, a 14mm becomes a 7mm, and the apparent field and eye relief of each eyepiece carry through unchanged.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eObservers filling gaps in a set:\u003c\/strong\u003e two eyepieces plus this extender cover four magnifications, which is a compact way to build a range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary and lunar observers:\u003c\/strong\u003e reaching high power by doubling a longer eyepiece keeps the eye relief of the longer eyepiece rather than the cramped eye position of a very short one.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyeglass wearers:\u003c\/strong\u003e Explore Scientific specifically notes the telecentric design's benefit here, because eye relief is inherited from the eyepiece rather than compressed by the amplifier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary imagers:\u003c\/strong\u003e doubling focal length raises image scale on the Moon and planets, and telecentricity keeps that factor predictable regardless of camera spacing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2x amplification, telecentric:\u003c\/strong\u003e the factor holds constant no matter what spacing the eyepiece or camera sits at, which a conventional Barlow does not do.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.0-inch barrel\u003c\/strong\u003e for 2-inch focusers and diagonals, with compatibility for both 1.25-inch and 2-inch eyepieces as published by Explore Scientific.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple precision elements\u003c\/strong\u003e in the optical group; Explore Scientific does not publish the element count.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEMD coating on the air-to-glass surfaces,\u003c\/strong\u003e which is where a multi-element amplifier gains or loses transmission and contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge-blackened elements\u003c\/strong\u003e to suppress the internal scatter that otherwise shows as a lowered contrast floor on planetary detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePublished dimensions:\u003c\/strong\u003e 118mm long, 66mm wide, 20 oz (0.57 kg).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eA conventional Barlow lens is a negative group placed ahead of focus. It works, but its amplification factor depends on the distance between the lens and the eyepiece field stop — move the eyepiece further back and a nominal 2x becomes 2.3x or 2.5x. Anything that changes that distance, such as a diagonal inserted between the two or a different eyepiece with a deeper field stop, changes the effective magnification and makes the resulting figure an estimate.\u003c\/p\u003e\n\u003cp\u003eA telecentric design adds a positive group after the negative one, so the light leaving the assembly travels as a bundle of rays parallel to the optical axis. Two things follow. The amplification stays at exactly 2x whatever the spacing behind it, so the arithmetic on magnification and image scale remains exact. And the light entering the eyepiece arrives as though it came from a much slower telescope, which is easier on eyepiece designs that show edge aberrations at steep light cones.\u003c\/p\u003e\n\u003cp\u003eThe eyepiece keeps its own characteristics through the extender. Apparent field is unchanged, eye relief is unchanged, and the true field simply halves along with the doubling of magnification. That is why doubling a 14mm to reach 7mm is more comfortable than using a 7mm directly — the eye position belongs to the 14mm.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-power lunar and planetary observing without buying very short focal length eyepieces.\u003c\/li\u003e\n\u003cli\u003eSplitting double stars, where the extra magnification is what opens a tight pair.\u003c\/li\u003e\n\u003cli\u003ePlanetary imaging, where doubling focal length raises image scale on a small sensor.\u003c\/li\u003e\n\u003cli\u003eUse with fast telescopes, where the telecentric output is gentler on eyepiece edge performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits 2-inch focusers and diagonals.\u003c\/strong\u003e Explore Scientific publishes compatibility with both 1.25-inch and 2.0-inch eyepiece barrel sizes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification:\u003c\/strong\u003e double whatever the eyepiece gives on its own. In a 714mm telescope, a 20mm eyepiece goes from 36x to 71x; a 9mm goes from 79x to 159x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffective focal ratio:\u003c\/strong\u003e doubles as well. An f\/5 telescope behaves as f\/10 behind it, an f\/7 as f\/14 — which is the figure that matters for planetary imaging exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging:\u003c\/strong\u003e because the factor is spacing-independent, a camera can sit at whatever backfocus the train needs and the image scale stays predictable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocus travel:\u003c\/strong\u003e an extender shifts the focus point outward, so the focuser racks in further than it would without it. Most telescopes have the travel; a very short-travel focuser is worth a check, and we can look at that with you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e the 2-inch barrel accepts standard 2-inch threaded filters, so a lunar or minus-violet filter can sit ahead of the optics rather than at the eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoubling magnification also doubles the effect of atmospheric turbulence.\u003c\/strong\u003e On an unsteady night the extended view softens, which is seeing rather than the optics. On a steady night it is where the aperture shows what it can do.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt needs a 2-inch focuser or diagonal.\u003c\/strong\u003e A telescope with only a 1.25-inch focuser is outside its range, and Explore Scientific makes a 1.25-inch focal extender for exactly that case — tell us your focuser and we will point you at the right one.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific publishes two weight figures across revisions.\u003c\/strong\u003e The current spec sheet lists 20 oz (0.57 kg); an earlier sheet listed 752 grams (26.5 oz). Both are recorded as published rather than averaged into one number.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe element count is not published,\u003c\/strong\u003e so that row reads as not published below rather than carrying a guess. We can ask our Explore Scientific rep if it matters to you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn extender adds length to the imaging train.\u003c\/strong\u003e At 118mm it needs room behind the focuser, which is worth a look on a compact refractor with a short drawtube. Send us the telescope and we will check the geometry with you.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo — it slides into a 2-inch focuser or diagonal, and the eyepiece slides into it. Refocusing after fitting it is the only step, and there is nothing to align or adjust.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between this and a Barlow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA Barlow's amplification varies with the spacing behind it, so a nominal 2x can drift to 2.5x depending on the eyepiece and whether a diagonal is in the path. This is telecentric, so 2x stays 2x at any spacing, and the exit light is parallel to the axis rather than converging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it work with my 1.25-inch eyepieces?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eExplore Scientific publishes compatibility with both 1.25-inch and 2.0-inch eyepiece barrels. The unit itself seats in a 2-inch focuser or diagonal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it change my eye relief?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The eyepiece keeps its own eye relief and apparent field — only the magnification changes. That is why doubling a longer eyepiece is more comfortable than using a very short one.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it for photography?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, particularly for the Moon and planets, where doubling focal length raises image scale. The telecentric design keeps the factor exact regardless of where the camera sensor sits.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a telecentric 2x focal extender with a 2-inch barrel, EMD-coated and edge-blackened elements, 118mm long at 20 oz, that doubles every eyepiece in your case while leaving apparent field and eye relief untouched. If you would like to know exactly which magnifications it will open up with the eyepieces you already own, send us the list and your telescope's focal length and we will work them out.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44012806930543,"sku":"FE02-020","price":249.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2xx_compact__37521.png?v=1766548235"},{"product_id":"explores-scientific-2x-1-25-field-extender","title":"Explore Scientific 2x 1.25-Inch Telecentric Focal Extender","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 2x Focal Extender is a 1.25-inch Barlow-type accessory that doubles the magnification of whatever eyepiece is placed in it. It is 96mm long, 45mm wide and weighs 260 grams (9.1 oz), and it is built on a telecentric optical layout using multiple precision lens elements rather than the single negative lens a simple Barlow uses.\u003c\/p\u003e\n\u003cp\u003eThe practical consequence of that layout is consistency. In a classic Barlow, the amplification factor depends on how far the eyepiece's field stop sits from the negative lens, so a 2x Barlow becomes a 2.3x or a 2.7x when spacing changes — when a diagonal goes in between, for instance, or when a different eyepiece design puts its field stop somewhere else. A telecentric design produces an exit beam whose rays run parallel to the optical axis, which holds the magnification factor at 2x regardless of spacing and keeps the eyepiece's own eye relief and image quality intact.\u003c\/p\u003e\n\u003cp\u003eThe result is that one 2x extender effectively doubles the number of magnifications your eyepiece set delivers: a 20mm becomes a 10mm-equivalent power, a 15mm becomes 7.5mm, a 30mm becomes 15mm — each while keeping the eye relief characteristics of the longer eyepiece.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyeglass wearers:\u003c\/strong\u003e this is the most useful case of all. Short-focal-length eyepieces are where eye relief runs out; using a longer eyepiece behind a telecentric extender gives high magnification while retaining the comfortable eye position of the longer eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observers\u003c\/strong\u003e who need to reach the magnifications where surface detail lives on the nights when seeing allows it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary imagers:\u003c\/strong\u003e doubling the focal length increases the image scale at the sensor, which is how a small planetary disc is made to cover enough pixels to resolve detail.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelecentric optical layout:\u003c\/strong\u003e the defining feature. Multiple precision lens elements produce a parallel exit beam, holding the 2x factor constant regardless of the distance to the eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent 2x amplification:\u003c\/strong\u003e the number on the barrel is the number you get, in a diagonal or straight into the focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreserves eye relief:\u003c\/strong\u003e the eyepiece behaves as it normally would, so its comfortable eye position carries through to the higher magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25-inch barrel:\u003c\/strong\u003e fits any standard 1.25-inch focuser or diagonal, and accepts any 1.25-inch eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePublished dimensions:\u003c\/strong\u003e 96mm long, 45mm wide, 260 grams (9.1 oz).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eA Barlow lens is a diverging optical group placed ahead of focus. It makes the converging light cone from the telescope shallower, which pushes the focal point further back and increases the effective focal length — and therefore the magnification. In its simplest form a single negative lens does the job, and it does it well enough for most purposes.\u003c\/p\u003e\n\u003cp\u003eThe weakness of the simple form is that the amount of amplification depends on where the eyepiece's field stop lands relative to that negative lens. Move the eyepiece further back and the factor rises. Insert a star diagonal between the Barlow and the eyepiece and the factor rises again. That is why a nominal 2x Barlow can end up delivering anywhere from 2x to nearly 3x depending on how it is used, which makes it hard to know what magnification you are actually observing at.\u003c\/p\u003e\n\u003cp\u003eA telecentric design solves this with a multi-element group that does more than diverge the beam. It re-forms the light so the chief rays exit parallel to the optical axis, which means the eyepiece behind it sees essentially the same geometry no matter where it sits. The amplification factor stays at 2x, the eyepiece's designed eye relief is preserved rather than compressed or stretched, and the correction the eyepiece was designed to deliver is not disturbed by the extra optics ahead of it.\u003c\/p\u003e\n\u003cp\u003eThere is one physical consequence worth understanding. Doubling the effective focal length also doubles the effective focal ratio: an f\/6 telescope behaves like an f\/12 one behind this extender. That halves the exit pupil for any given eyepiece and reduces image brightness accordingly, which is why focal extenders belong to lunar, planetary and double-star observing rather than to faint deep-sky work.\u003c\/p\u003e\n\u003cp\u003eExplore Scientific does not publish the exact element count for this extender, describing it as multiple precision lens elements, and does not publish a filter thread specification. Those rows are marked unpublished below rather than estimated.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-power lunar observing, where doubling a mid-range eyepiece reaches crater-floor detail along the terminator.\u003c\/li\u003e\n\u003cli\u003ePlanetary observing on steady nights — Jovian belt structure, the Cassini division, Martian surface markings.\u003c\/li\u003e\n\u003cli\u003ePlanetary and lunar imaging, where doubling the focal length gives the image scale a small planetary disc needs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits any 1.25-inch focuser or diagonal,\u003c\/strong\u003e and accepts any 1.25-inch eyepiece. In a 2-inch focuser it seats in a 2-inch to 1.25-inch adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification:\u003c\/strong\u003e telescope focal length × 2 ÷ eyepiece focal length. In a 952mm telescope, a 20mm eyepiece goes from 48x to 95x; a 12mm from 79x to 159x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffective focal ratio:\u003c\/strong\u003e doubles. An f\/6 telescope works at f\/12 behind the extender, and an f\/10 at f\/20.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExit pupil:\u003c\/strong\u003e halves for a given eyepiece, which is why the extender pairs best with mid and long focal length eyepieces rather than the shortest one in the case.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoubling magnification halves image brightness for a given eyepiece.\u003c\/strong\u003e That is fine on the Moon and the planets, and it is why deep-sky observing generally stays at native focal length. The extender is a Solar System and double-star tool.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeeing sets the ceiling, not the optics.\u003c\/strong\u003e On a turbulent night, higher magnification enlarges the turbulence along with the target. The extender earns its keep on steady nights, which is exactly what it was made for.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePairing it with your shortest eyepiece often overshoots.\u003c\/strong\u003e A 2x extender behind a 5mm in a metre-focal-length telescope produces magnification most apertures cannot support. Mid-range eyepieces are the productive partners, and the results are visibly better.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific does not publish the element count or a filter thread figure\u003c\/strong\u003e for this extender, so those rows read as unpublished rather than estimated. If either matters, ask and we will check with our Explore Scientific rep.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo — the extender goes into the focuser or diagonal and the eyepiece goes into the extender. There is nothing to adjust, and because the design is telecentric, the spacing does not need to be set precisely to get the stated 2x.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between this and a regular Barlow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA simple Barlow's amplification factor changes with spacing, so a nominal 2x can become 2.5x or more once a diagonal or a different eyepiece is involved. A telecentric design produces a parallel exit beam, so it stays at 2x regardless, and it preserves the eyepiece's own eye relief instead of altering it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat magnification will I get?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDouble whatever the eyepiece gives on its own. Telescope focal length × 2, divided by eyepiece focal length. A 1000mm telescope with a 20mm eyepiece goes from 50x to 100x.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it good for eyeglass wearers?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is one of the best answers there is. Instead of buying a very short eyepiece with minimal eye relief, you use a longer, more comfortable eyepiece behind the extender and get the same magnification with the eye relief the longer eyepiece was designed around.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a 1.25-inch 2x focal extender with a telecentric multi-element design that holds its amplification factor and its eye relief regardless of spacing, at 96mm long and 260 grams. It doubles the number of magnifications your eyepiece set delivers and is particularly useful if you observe with glasses on. If you would like a second opinion on which of your eyepieces it pairs with best, send us the list and your telescope's focal length and we will work it through with you.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44012807716975,"sku":"FE02-125","price":165.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2x_compact__89719.png?v=1766548241"},{"product_id":"explore-scientific-3x-1-25-field-extender","title":"Explore Scientific 3x 1.25-Inch Telecentric Focal Extender","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific 3x Focal Extender is a 1.25-inch telecentric amplifier that triples the magnification of whatever eyepiece is placed in it. Explore Scientific publishes a length of 93mm, a width of 45mm and a weight of 249 grams (8.7 oz), and describes the optical design as telecentric, using multiple precision lens elements to deliver light rays parallel to the optical axis.\u003c\/p\u003e\n\u003cp\u003eThat last point is what separates a telecentric focal extender from a conventional Barlow. In a Barlow, the amplification factor depends on how far the eyepiece field stop sits from the negative lens — add an extension or a diagonal into the train and the stated 2x quietly becomes 2.4x. A telecentric design sends the light out parallel, so the magnification stays at 3x regardless of the spacing behind it. What you calculate is what you get.\u003c\/p\u003e\n\u003cp\u003eThe other consequence is eye relief. A 3x extender lets a comfortable long-focal-length eyepiece do the work of a very short one: a 15mm eyepiece behind this unit performs like a 5mm while keeping the 15mm's eye relief. For eyeglass wearers and for anyone who finds short-focal-length eyepieces cramped, that is the main reason to own one.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observers\u003c\/strong\u003e who want to reach high magnification without buying the very shortest eyepieces in a series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyeglass wearers:\u003c\/strong\u003e the extender preserves the eye relief of the eyepiece in front of it, which is exactly what short eyepieces sacrifice.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOwners of fast telescopes:\u003c\/strong\u003e at f\/4 or f\/5 a 3x extender turns the effective focal ratio into f\/12 or f\/15 at the eyepiece, which eases the demands on eyepiece design at the field edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble-star observers\u003c\/strong\u003e who need magnification on demand without swapping through a whole case.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary imagers\u003c\/strong\u003e using a 1.25-inch camera nose, where telecentric output keeps the amplification factor predictable in the image scale calculation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3x magnification factor:\u003c\/strong\u003e a full three times, applied to whatever eyepiece is inserted.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelecentric optical design:\u003c\/strong\u003e multiple precision lens elements arranged to emit rays parallel to the optical axis, so the amplification does not drift with spacing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye relief preserved:\u003c\/strong\u003e the eyepiece keeps its own eye relief, so a long eyepiece at high power stays comfortable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25-inch barrel:\u003c\/strong\u003e fits any standard 1.25-inch focuser or diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePublished dimensions:\u003c\/strong\u003e 93mm long, 45mm wide, 249 grams (8.7 oz).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent scale for imaging:\u003c\/strong\u003e because the factor is fixed, image scale calculations for planetary capture stay reliable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eA conventional Barlow lens is a negative element placed ahead of focus. It makes the converging light cone from the telescope shallower, which pushes focus further back and increases the effective focal length. The catch is that the amount of increase depends on the distance between the negative lens and the eyepiece field stop. Move the eyepiece back — by adding an extension tube, a filter wheel, or a diagonal in the wrong place — and the amplification climbs above the printed figure.\u003c\/p\u003e\n\u003cp\u003eA telecentric design solves this by adding positive elements behind the negative group so that the exit rays leave parallel to the optical axis rather than diverging. Parallel rays mean the effective amplification stops depending on how far away the next component sits. A 3x telecentric extender is 3x with a diagonal in the train, 3x with an extension tube, and 3x with a camera on the back.\u003c\/p\u003e\n\u003cp\u003eThe trade with any amplifier is light. Tripling magnification spreads the same photons over nine times the area, so the image is dimmer and the exit pupil shrinks to a third of what the eyepiece alone would give. That is why an extender belongs on bright targets: the Moon, the planets, double stars, and the brighter compact deep-sky objects.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-power lunar and planetary observing without a dedicated short-focal-length eyepiece.\u003c\/li\u003e\n\u003cli\u003eSplitting close double stars.\u003c\/li\u003e\n\u003cli\u003ePlanetary and lunar imaging with a 1.25-inch camera, where a predictable amplification factor matters to image scale.\u003c\/li\u003e\n\u003cli\u003eExtending a modest eyepiece set into a larger range of magnifications.\u003c\/li\u003e\n\u003cli\u003eObserving with eyeglasses at high power, where a long eyepiece behind the extender keeps the eye relief.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits any 1.25-inch focuser or diagonal.\u003c\/strong\u003e In a 2-inch focuser it takes a 2-inch to 1.25-inch adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResulting magnification:\u003c\/strong\u003e telescope focal length ÷ eyepiece focal length × 3. A 20mm eyepiece in a 952mm telescope gives 143x; a 15mm in a 1200mm gives 240x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffective focal length:\u003c\/strong\u003e the telescope behaves as though its focal length were tripled — a 714mm f\/7 refractor becomes 2142mm at f\/21 at the eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePairing:\u003c\/strong\u003e mid and long focal length eyepieces are the natural partners. A 25mm, 20mm or 15mm behind this unit produces the equivalent of an 8.3mm, 6.7mm or 5mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhere it stops helping:\u003c\/strong\u003e putting a 3mm or 4mm eyepiece behind a 3x extender exceeds the useful magnification of nearly any aperture. The long end of your case is where the gains are.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging:\u003c\/strong\u003e a 1.25-inch camera nose fits directly. Because the design is telecentric, the amplification stays at 3x whatever the backfocus, which keeps the plate scale calculation honest.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e Explore Scientific does not publish the filter thread specification for this extender, so we are not quoting one. Filters can also be threaded onto the eyepiece instead, which is the usual arrangement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3x is a large step, and the atmosphere has a vote.\u003c\/strong\u003e On a steady night in a well-cooled telescope it opens up the top of the magnification range; on a turbulent night a 2x extender or the eyepiece alone will show more detail. Many observers keep both factors on hand for that reason, and we stock the 2x as well.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe image gets dimmer as it gets bigger.\u003c\/strong\u003e Three times the magnification means roughly one ninth the surface brightness, which is why bright targets are where an extender earns its place.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific publishes two slightly different sets of physical figures for this item\u003c\/strong\u003e — 93mm and 249 grams on the current product page, 96mm and 260 grams on the spec sheet supplied with earlier stock. The optical specification is the same; the difference is in production revisions. If the exact dimension matters for a case, ask us and we will confirm it with our rep.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElement count and coatings are not published\u003c\/strong\u003e beyond the description of multiple precision lens elements, so those rows read \"Not published by vendor\" below rather than carrying an estimate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo — the extender goes into the focuser or diagonal, the eyepiece goes into the extender, and that is the whole procedure. Refocusing after fitting it is normal, since the extender moves the focal point outward.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between this and a Barlow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA Barlow's amplification changes with the spacing behind it. A telecentric extender sends light out parallel to the optical axis, so 3x stays 3x whatever else is in the train — diagonal, extension tube or camera.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it reduce eye relief?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, and that is one of the main reasons to use one. The eyepiece keeps its own eye relief, so a 20mm eyepiece at 3x gives the magnification of a 6.7mm with the comfort of a 20mm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich eyepieces should I pair it with?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe mid and long focal lengths in your case. A 25mm, 20mm or 15mm become the equivalent of 8.3mm, 6.7mm and 5mm. Very short eyepieces behind a 3x go past what most apertures can use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it for photography?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, for lunar and planetary imaging with a 1.25-inch camera. The fixed telecentric factor is a practical advantage, because the image scale calculation stays correct no matter what spacing the camera ends up at.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it work with my telescope?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAny telescope with a 1.25-inch focuser or diagonal takes it, and a 2-inch focuser takes it through an adapter. Whether 3x is the right factor depends on your focal length and aperture — send us those and we will tell you which factor suits.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a 1.25-inch telecentric 3x focal extender at 93mm and 249 grams that triples magnification with a fixed, spacing-independent factor and leaves the eyepiece's eye relief intact — a straightforward way to turn the comfortable half of your eyepiece case into a high-power set. If you would like a recommendation on whether 2x or 3x suits your telescope's focal length better, send us the figures and we will work it out with you.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44012809027695,"sku":"FE03-125","price":193.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/3x_compact__06275.png?v=1766548248"},{"product_id":"antares-0-7x-2-focal-reducer","title":"Antares 0.7x 2\" focal reducer","description":"\u003cp data-start=\"156\" data-end=\"448\"\u003eGive your long-focus scope a wider, brighter personality. The Antares 2\" 0.7× reducer threads on like a standard 2\" filter and shortens your telescope’s effective focal length, opening up larger swaths of sky and cutting exposure times—perfect for galaxies, nebulae, and sweeping star fields.\u003c\/p\u003e\n\u003cp data-start=\"450\" data-end=\"472\"\u003e\u003cstrong data-start=\"450\" data-end=\"472\"\u003eWhy you’ll like it\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"473\" data-end=\"837\"\u003e\n\u003cli data-start=\"473\" data-end=\"571\"\u003e\n\u003cp data-start=\"475\" data-end=\"571\"\u003e\u003cstrong data-start=\"475\" data-end=\"508\"\u003e0.7× class reduction at 66 mm\u003c\/strong\u003e working distance (from the reducer’s rear lens to the sensor).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"572\" data-end=\"659\"\u003e\n\u003cp data-start=\"574\" data-end=\"659\"\u003e\u003cstrong data-start=\"574\" data-end=\"599\"\u003eTunable field of view\u003c\/strong\u003e: add spacers to increase reduction for even faster imaging.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"660\" data-end=\"762\"\u003e\n\u003cp data-start=\"662\" data-end=\"762\"\u003e\u003cstrong data-start=\"662\" data-end=\"704\"\u003e2\" format with standard filter threads\u003c\/strong\u003e for easy integration with cameras, wheels, and diagonals.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"763\" data-end=\"837\"\u003e\n\u003cp data-start=\"765\" data-end=\"837\"\u003e\u003cstrong data-start=\"765\" data-end=\"808\"\u003eHigh-quality, fully multi-coated optics\u003c\/strong\u003e for crisp, contrasty images.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"839\" data-end=\"842\"\u003e\n\u003ch2 data-start=\"844\" data-end=\"880\"\u003eHow spacing changes the reduction\u003c\/h2\u003e\n\u003cp data-start=\"882\" data-end=\"1149\"\u003eAs you increase the spacing (back focus), the reduction increases (wider field, faster f\/ratio). Use the table below as a practical guide. Values are approximate and based on the common reducer relationship around this class; plate solve to confirm your exact result.\u003c\/p\u003e\n\u003ch3 data-start=\"1151\" data-end=\"1239\"\u003eSpacer → Reduction quick reference (sensor distance measured from reducer to sensor)\u003c\/h3\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\" data-start=\"1241\" data-end=\"1515\"\u003e\n\u003cthead data-start=\"1241\" data-end=\"1319\"\u003e\n\u003ctr data-start=\"1241\" data-end=\"1319\"\u003e\n\u003cth data-start=\"1241\" data-end=\"1265\" data-col-size=\"sm\"\u003eAdded Spacer vs 66 mm\u003c\/th\u003e\n\u003cth data-start=\"1265\" data-end=\"1283\" data-col-size=\"sm\"\u003eBack Focus (mm)\u003c\/th\u003e\n\u003cth data-start=\"1283\" data-end=\"1303\" data-col-size=\"sm\"\u003eApprox. Reduction\u003c\/th\u003e\n\u003cth data-start=\"1303\" data-end=\"1319\" data-col-size=\"sm\"\u003ef\/10 Becomes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"1342\" data-end=\"1515\"\u003e\n\u003ctr data-start=\"1342\" data-end=\"1373\"\u003e\n\u003ctd data-start=\"1342\" data-end=\"1350\" data-col-size=\"sm\"\u003e+0 mm\u003c\/td\u003e\n\u003ctd data-start=\"1350\" data-end=\"1355\" data-col-size=\"sm\"\u003e66\u003c\/td\u003e\n\u003ctd data-start=\"1355\" data-end=\"1364\" data-col-size=\"sm\"\u003e~0.70×\u003c\/td\u003e\n\u003ctd data-start=\"1364\" data-end=\"1373\" data-col-size=\"sm\"\u003ef\/7.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1374\" data-end=\"1405\"\u003e\n\u003ctd data-start=\"1374\" data-end=\"1382\" data-col-size=\"sm\"\u003e+5 mm\u003c\/td\u003e\n\u003ctd data-start=\"1382\" data-end=\"1387\" data-col-size=\"sm\"\u003e71\u003c\/td\u003e\n\u003ctd data-start=\"1387\" data-end=\"1396\" data-col-size=\"sm\"\u003e~0.68×\u003c\/td\u003e\n\u003ctd data-start=\"1396\" data-end=\"1405\" data-col-size=\"sm\"\u003ef\/6.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1406\" data-end=\"1438\"\u003e\n\u003ctd data-start=\"1406\" data-end=\"1415\" data-col-size=\"sm\"\u003e+10 mm\u003c\/td\u003e\n\u003ctd data-start=\"1415\" data-end=\"1420\" data-col-size=\"sm\"\u003e76\u003c\/td\u003e\n\u003ctd data-start=\"1420\" data-end=\"1429\" data-col-size=\"sm\"\u003e~0.66×\u003c\/td\u003e\n\u003ctd data-start=\"1429\" data-end=\"1438\" data-col-size=\"sm\"\u003ef\/6.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1439\" data-end=\"1471\"\u003e\n\u003ctd data-start=\"1439\" data-end=\"1448\" data-col-size=\"sm\"\u003e+15 mm\u003c\/td\u003e\n\u003ctd data-start=\"1448\" data-end=\"1453\" data-col-size=\"sm\"\u003e81\u003c\/td\u003e\n\u003ctd data-start=\"1453\" data-end=\"1462\" data-col-size=\"sm\"\u003e~0.64×\u003c\/td\u003e\n\u003ctd data-start=\"1462\" data-end=\"1471\" data-col-size=\"sm\"\u003ef\/6.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1472\" data-end=\"1515\"\u003e\n\u003ctd data-start=\"1472\" data-end=\"1481\" data-col-size=\"sm\"\u003e+20 mm\u003c\/td\u003e\n\u003ctd data-start=\"1481\" data-end=\"1486\" data-col-size=\"sm\"\u003e86\u003c\/td\u003e\n\u003ctd data-start=\"1486\" data-end=\"1500\" data-col-size=\"sm\"\u003e~0.61–0.62×\u003c\/td\u003e\n\u003ctd data-start=\"1500\" data-end=\"1515\" data-col-size=\"sm\"\u003ef\/6.1–f\/6.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp data-start=\"1517\" data-end=\"1525\"\u003e\u003cstrong data-start=\"1517\" data-end=\"1525\"\u003eTips\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1526\" data-end=\"1799\"\u003e\n\u003cli data-start=\"1526\" data-end=\"1579\"\u003e\n\u003cp data-start=\"1528\" data-end=\"1579\"\u003eStart at \u003cstrong data-start=\"1537\" data-end=\"1546\"\u003e66 mm\u003c\/strong\u003e for the nominal 0.7× experience.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1580\" data-end=\"1680\"\u003e\n\u003cp data-start=\"1582\" data-end=\"1680\"\u003eAdd spacers in small steps and confirm with a quick plate solve to dial in framing and star shape.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1681\" data-end=\"1799\"\u003e\n\u003cp data-start=\"1683\" data-end=\"1799\"\u003eVery large spacing can push the system too hard and may introduce edge aberrations—balance speed with image quality.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eExamples of FOV when used with some cameras\u003c\/p\u003e\n\u003ch1 data-start=\"711\" data-end=\"740\"\u003eASI294 (4.63 µm, 4144×2822)\u003c\/h1\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\" data-start=\"742\" data-end=\"1151\"\u003e\n\u003cthead data-start=\"742\" data-end=\"839\"\u003e\n\u003ctr data-start=\"742\" data-end=\"839\"\u003e\n\u003cth data-start=\"742\" data-end=\"766\" data-col-size=\"sm\"\u003eAdded Spacer vs 66 mm\u003c\/th\u003e\n\u003cth data-start=\"766\" data-end=\"776\" data-col-size=\"sm\"\u003eBF (mm)\u003c\/th\u003e\n\u003cth data-start=\"776\" data-end=\"792\" data-col-size=\"sm\"\u003eReduction (×)\u003c\/th\u003e\n\u003cth data-start=\"792\" data-end=\"807\" data-col-size=\"sm\"\u003eEff. FL (mm)\u003c\/th\u003e\n\u003cth data-start=\"807\" data-end=\"828\" data-col-size=\"sm\"\u003ePixel Scale (″\/px)\u003c\/th\u003e\n\u003cth data-start=\"828\" data-end=\"839\" data-col-size=\"sm\"\u003eFOV (°)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"872\" data-end=\"1151\"\u003e\n\u003ctr data-start=\"872\" data-end=\"932\"\u003e\n\u003ctd data-start=\"872\" data-end=\"877\" data-col-size=\"sm\"\u003e+0\u003c\/td\u003e\n\u003ctd data-start=\"877\" data-end=\"882\" data-col-size=\"sm\"\u003e66\u003c\/td\u003e\n\u003ctd data-start=\"882\" data-end=\"893\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"884\" data-end=\"892\"\u003e0.70\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"893\" data-end=\"899\" data-col-size=\"sm\"\u003e700\u003c\/td\u003e\n\u003ctd data-start=\"899\" data-end=\"911\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"901\" data-end=\"910\"\u003e1.364\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"911\" data-end=\"932\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"913\" data-end=\"930\"\u003e1.570 × 1.069\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"933\" data-end=\"983\"\u003e\n\u003ctd data-start=\"933\" data-end=\"938\" data-col-size=\"sm\"\u003e+5\u003c\/td\u003e\n\u003ctd data-start=\"938\" data-end=\"943\" data-col-size=\"sm\"\u003e71\u003c\/td\u003e\n\u003ctd data-start=\"943\" data-end=\"950\" data-col-size=\"sm\"\u003e0.68\u003c\/td\u003e\n\u003ctd data-start=\"950\" data-end=\"958\" data-col-size=\"sm\"\u003e677.3\u003c\/td\u003e\n\u003ctd data-start=\"958\" data-end=\"966\" data-col-size=\"sm\"\u003e1.410\u003c\/td\u003e\n\u003ctd data-start=\"966\" data-end=\"983\" data-col-size=\"sm\"\u003e1.623 × 1.105\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"984\" data-end=\"1035\"\u003e\n\u003ctd data-start=\"984\" data-end=\"990\" data-col-size=\"sm\"\u003e+10\u003c\/td\u003e\n\u003ctd data-start=\"990\" data-end=\"995\" data-col-size=\"sm\"\u003e76\u003c\/td\u003e\n\u003ctd data-start=\"995\" data-end=\"1002\" data-col-size=\"sm\"\u003e0.65\u003c\/td\u003e\n\u003ctd data-start=\"1002\" data-end=\"1010\" data-col-size=\"sm\"\u003e654.5\u003c\/td\u003e\n\u003ctd data-start=\"1010\" data-end=\"1018\" data-col-size=\"sm\"\u003e1.460\u003c\/td\u003e\n\u003ctd data-start=\"1018\" data-end=\"1035\" data-col-size=\"sm\"\u003e1.679 × 1.142\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1036\" data-end=\"1087\"\u003e\n\u003ctd data-start=\"1036\" data-end=\"1042\" data-col-size=\"sm\"\u003e+15\u003c\/td\u003e\n\u003ctd data-start=\"1042\" data-end=\"1047\" data-col-size=\"sm\"\u003e81\u003c\/td\u003e\n\u003ctd data-start=\"1047\" data-end=\"1054\" data-col-size=\"sm\"\u003e0.63\u003c\/td\u003e\n\u003ctd data-start=\"1054\" data-end=\"1062\" data-col-size=\"sm\"\u003e631.8\u003c\/td\u003e\n\u003ctd data-start=\"1062\" data-end=\"1070\" data-col-size=\"sm\"\u003e1.516\u003c\/td\u003e\n\u003ctd data-start=\"1070\" data-end=\"1087\" data-col-size=\"sm\"\u003e1.740 × 1.184\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1088\" data-end=\"1151\"\u003e\n\u003ctd data-start=\"1088\" data-end=\"1094\" data-col-size=\"sm\"\u003e+20\u003c\/td\u003e\n\u003ctd data-start=\"1094\" data-end=\"1099\" data-col-size=\"sm\"\u003e86\u003c\/td\u003e\n\u003ctd data-start=\"1099\" data-end=\"1110\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1101\" data-end=\"1109\"\u003e0.61\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1110\" data-end=\"1118\" data-col-size=\"sm\"\u003e609.1\u003c\/td\u003e\n\u003ctd data-start=\"1118\" data-end=\"1130\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1120\" data-end=\"1129\"\u003e1.572\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1130\" data-end=\"1151\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1132\" data-end=\"1149\"\u003e1.802 × 1.227\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr data-start=\"1153\" data-end=\"1156\"\u003e\n\u003ch1 data-start=\"1158\" data-end=\"1187\"\u003eASI533 (3.76 µm, 3008×3008)\u003c\/h1\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\" data-start=\"1189\" data-end=\"1598\"\u003e\n\u003cthead data-start=\"1189\" data-end=\"1286\"\u003e\n\u003ctr data-start=\"1189\" data-end=\"1286\"\u003e\n\u003cth data-start=\"1189\" data-end=\"1213\" data-col-size=\"sm\"\u003eAdded Spacer vs 66 mm\u003c\/th\u003e\n\u003cth data-start=\"1213\" data-end=\"1223\" data-col-size=\"sm\"\u003eBF (mm)\u003c\/th\u003e\n\u003cth data-start=\"1223\" data-end=\"1239\" data-col-size=\"sm\"\u003eReduction (×)\u003c\/th\u003e\n\u003cth data-start=\"1239\" data-end=\"1254\" data-col-size=\"sm\"\u003eEff. FL (mm)\u003c\/th\u003e\n\u003cth data-start=\"1254\" data-end=\"1275\" data-col-size=\"sm\"\u003ePixel Scale (″\/px)\u003c\/th\u003e\n\u003cth data-start=\"1275\" data-end=\"1286\" data-col-size=\"sm\"\u003eFOV (°)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"1319\" data-end=\"1598\"\u003e\n\u003ctr data-start=\"1319\" data-end=\"1379\"\u003e\n\u003ctd data-start=\"1319\" data-end=\"1324\" data-col-size=\"sm\"\u003e+0\u003c\/td\u003e\n\u003ctd data-start=\"1324\" data-end=\"1329\" data-col-size=\"sm\"\u003e66\u003c\/td\u003e\n\u003ctd data-start=\"1329\" data-end=\"1340\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1331\" data-end=\"1339\"\u003e0.70\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1340\" data-end=\"1346\" data-col-size=\"sm\"\u003e700\u003c\/td\u003e\n\u003ctd data-start=\"1346\" data-end=\"1358\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1348\" data-end=\"1357\"\u003e1.109\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1358\" data-end=\"1379\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1360\" data-end=\"1377\"\u003e0.927 × 0.927\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1380\" data-end=\"1430\"\u003e\n\u003ctd data-start=\"1380\" data-end=\"1385\" data-col-size=\"sm\"\u003e+5\u003c\/td\u003e\n\u003ctd data-start=\"1385\" data-end=\"1390\" data-col-size=\"sm\"\u003e71\u003c\/td\u003e\n\u003ctd data-start=\"1390\" data-end=\"1397\" data-col-size=\"sm\"\u003e0.68\u003c\/td\u003e\n\u003ctd data-start=\"1397\" data-end=\"1405\" data-col-size=\"sm\"\u003e677.3\u003c\/td\u003e\n\u003ctd data-start=\"1405\" data-end=\"1413\" data-col-size=\"sm\"\u003e1.147\u003c\/td\u003e\n\u003ctd data-start=\"1413\" data-end=\"1430\" data-col-size=\"sm\"\u003e0.958 × 0.958\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1431\" data-end=\"1482\"\u003e\n\u003ctd data-start=\"1431\" data-end=\"1437\" data-col-size=\"sm\"\u003e+10\u003c\/td\u003e\n\u003ctd data-start=\"1437\" data-end=\"1442\" data-col-size=\"sm\"\u003e76\u003c\/td\u003e\n\u003ctd data-start=\"1442\" data-end=\"1449\" data-col-size=\"sm\"\u003e0.65\u003c\/td\u003e\n\u003ctd data-start=\"1449\" data-end=\"1457\" data-col-size=\"sm\"\u003e654.5\u003c\/td\u003e\n\u003ctd data-start=\"1457\" data-end=\"1465\" data-col-size=\"sm\"\u003e1.186\u003c\/td\u003e\n\u003ctd data-start=\"1465\" data-end=\"1482\" data-col-size=\"sm\"\u003e0.991 × 0.991\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1483\" data-end=\"1534\"\u003e\n\u003ctd data-start=\"1483\" data-end=\"1489\" data-col-size=\"sm\"\u003e+15\u003c\/td\u003e\n\u003ctd data-start=\"1489\" data-end=\"1494\" data-col-size=\"sm\"\u003e81\u003c\/td\u003e\n\u003ctd data-start=\"1494\" data-end=\"1501\" data-col-size=\"sm\"\u003e0.63\u003c\/td\u003e\n\u003ctd data-start=\"1501\" data-end=\"1509\" data-col-size=\"sm\"\u003e631.8\u003c\/td\u003e\n\u003ctd data-start=\"1509\" data-end=\"1517\" data-col-size=\"sm\"\u003e1.228\u003c\/td\u003e\n\u003ctd data-start=\"1517\" data-end=\"1534\" data-col-size=\"sm\"\u003e1.025 × 1.025\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1535\" data-end=\"1598\"\u003e\n\u003ctd data-start=\"1535\" data-end=\"1541\" data-col-size=\"sm\"\u003e+20\u003c\/td\u003e\n\u003ctd data-start=\"1541\" data-end=\"1546\" data-col-size=\"sm\"\u003e86\u003c\/td\u003e\n\u003ctd data-start=\"1546\" data-end=\"1557\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1548\" data-end=\"1556\"\u003e0.61\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1557\" data-end=\"1565\" data-col-size=\"sm\"\u003e609.1\u003c\/td\u003e\n\u003ctd data-start=\"1565\" data-end=\"1577\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1567\" data-end=\"1576\"\u003e1.273\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1577\" data-end=\"1598\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1579\" data-end=\"1596\"\u003e1.063 × 1.063\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr data-start=\"1600\" data-end=\"1603\"\u003e\n\u003ch1 data-start=\"1605\" data-end=\"1634\"\u003eASI585 (2.90 µm, 3840×2160)\u003c\/h1\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\" data-start=\"1636\" data-end=\"2045\"\u003e\n\u003cthead data-start=\"1636\" data-end=\"1733\"\u003e\n\u003ctr data-start=\"1636\" data-end=\"1733\"\u003e\n\u003cth data-start=\"1636\" data-end=\"1660\" data-col-size=\"sm\"\u003eAdded Spacer vs 66 mm\u003c\/th\u003e\n\u003cth data-start=\"1660\" data-end=\"1670\" data-col-size=\"sm\"\u003eBF (mm)\u003c\/th\u003e\n\u003cth data-start=\"1670\" data-end=\"1686\" data-col-size=\"sm\"\u003eReduction (×)\u003c\/th\u003e\n\u003cth data-start=\"1686\" data-end=\"1701\" data-col-size=\"sm\"\u003eEff. FL (mm)\u003c\/th\u003e\n\u003cth data-start=\"1701\" data-end=\"1722\" data-col-size=\"sm\"\u003ePixel Scale (″\/px)\u003c\/th\u003e\n\u003cth data-start=\"1722\" data-end=\"1733\" data-col-size=\"sm\"\u003eFOV (°)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"1766\" data-end=\"2045\"\u003e\n\u003ctr data-start=\"1766\" data-end=\"1826\"\u003e\n\u003ctd data-start=\"1766\" data-end=\"1771\" data-col-size=\"sm\"\u003e+0\u003c\/td\u003e\n\u003ctd data-start=\"1771\" data-end=\"1776\" data-col-size=\"sm\"\u003e66\u003c\/td\u003e\n\u003ctd data-start=\"1776\" data-end=\"1787\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1778\" data-end=\"1786\"\u003e0.70\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1787\" data-end=\"1793\" data-col-size=\"sm\"\u003e700\u003c\/td\u003e\n\u003ctd data-start=\"1793\" data-end=\"1805\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1795\" data-end=\"1804\"\u003e0.854\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1805\" data-end=\"1826\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1807\" data-end=\"1824\"\u003e0.912 × 0.513\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1827\" data-end=\"1877\"\u003e\n\u003ctd data-start=\"1827\" data-end=\"1832\" data-col-size=\"sm\"\u003e+5\u003c\/td\u003e\n\u003ctd data-start=\"1832\" data-end=\"1837\" data-col-size=\"sm\"\u003e71\u003c\/td\u003e\n\u003ctd data-start=\"1837\" data-end=\"1844\" data-col-size=\"sm\"\u003e0.68\u003c\/td\u003e\n\u003ctd data-start=\"1844\" data-end=\"1852\" data-col-size=\"sm\"\u003e677.3\u003c\/td\u003e\n\u003ctd data-start=\"1852\" data-end=\"1860\" data-col-size=\"sm\"\u003e0.883\u003c\/td\u003e\n\u003ctd data-start=\"1860\" data-end=\"1877\" data-col-size=\"sm\"\u003e0.943 × 0.531\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1878\" data-end=\"1929\"\u003e\n\u003ctd data-start=\"1878\" data-end=\"1884\" data-col-size=\"sm\"\u003e+10\u003c\/td\u003e\n\u003ctd data-start=\"1884\" data-end=\"1889\" data-col-size=\"sm\"\u003e76\u003c\/td\u003e\n\u003ctd data-start=\"1889\" data-end=\"1896\" data-col-size=\"sm\"\u003e0.65\u003c\/td\u003e\n\u003ctd data-start=\"1896\" data-end=\"1904\" data-col-size=\"sm\"\u003e654.5\u003c\/td\u003e\n\u003ctd data-start=\"1904\" data-end=\"1912\" data-col-size=\"sm\"\u003e0.914\u003c\/td\u003e\n\u003ctd data-start=\"1912\" data-end=\"1929\" data-col-size=\"sm\"\u003e0.977 × 0.550\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1930\" data-end=\"1981\"\u003e\n\u003ctd data-start=\"1930\" data-end=\"1936\" data-col-size=\"sm\"\u003e+15\u003c\/td\u003e\n\u003ctd data-start=\"1936\" data-end=\"1941\" data-col-size=\"sm\"\u003e81\u003c\/td\u003e\n\u003ctd data-start=\"1941\" data-end=\"1948\" data-col-size=\"sm\"\u003e0.63\u003c\/td\u003e\n\u003ctd data-start=\"1948\" data-end=\"1956\" data-col-size=\"sm\"\u003e631.8\u003c\/td\u003e\n\u003ctd data-start=\"1956\" data-end=\"1964\" data-col-size=\"sm\"\u003e0.946\u003c\/td\u003e\n\u003ctd data-start=\"1964\" data-end=\"1981\" data-col-size=\"sm\"\u003e1.010 × 0.568\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1982\" data-end=\"2045\"\u003e\n\u003ctd data-start=\"1982\" data-end=\"1988\" data-col-size=\"sm\"\u003e+20\u003c\/td\u003e\n\u003ctd data-start=\"1988\" data-end=\"1993\" data-col-size=\"sm\"\u003e86\u003c\/td\u003e\n\u003ctd data-start=\"1993\" data-end=\"2004\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1995\" data-end=\"2003\"\u003e0.61\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2004\" data-end=\"2012\" data-col-size=\"sm\"\u003e609.1\u003c\/td\u003e\n\u003ctd data-start=\"2012\" data-end=\"2024\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2014\" data-end=\"2023\"\u003e0.982\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2024\" data-end=\"2045\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2026\" data-end=\"2043\"\u003e1.048 × 0.589\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Antares","offers":[{"title":"Default Title","offer_id":44013155713135,"sku":"FR2-0.7","price":106.92,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/antares-fr2-0-07x-reducer-1000__85948.jpg?v=1766548677"},{"product_id":"3-field-flattener-7x-focal-reducer","title":"3\" FIELD FLATTENER .7X FOCAL REDUCER","description":"\u003cp\u003eExplore Scientific’s 3-inch Field Flattener\/0.7x Focal Reducer is a multi-faceted accessory designed to enhance your astrophotography experiences. As a field flattener, this piece addresses the edge-of-field aberrations caused by curved focal planes to ensure your night at the eyepiece will result in crisp, true images.\u003c\/p\u003e\n\u003cp\u003eAs a focal reducer, this device will reduce your f-ratio by 0.7, which results in a wider field of view, brighter images and less exposure time. Recommended for our 127mm and 152mm refracting telescopes (excluding our doublet refractors), this field flattener\/focal reducer boasts fully multi-coated optics.\u003cbr\u003e\u003cbr\u003eThis item comes with a threaded adapter that threads onto the Explore Scientific 2-inch rack-and-pinion focuser. Threaded attachment to a 2.5-hex focuser, which comes stock on our 127mm APO telescopes, requires purchase of an additional adapter. \u003c\/p\u003e\n\u003cp\u003eThe field flattener\/focal reducer offers 55 mm of back focus from the rear face of the device. The M42x0.75 adapter adds 3 mm, so the sensor needs to be 52 mm from the face of the adapter.\u003cbr\u003e\u003cbr\u003eTo connect to the 2.5 hex focuser, purchase item number\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/ontariotelescope.com\/products\/explore-scientific-adapter-for-fffr507x-00-to-2-5-hex-focuser\" target=\"_blank\" title=\"FFFR adapter\" rel=\"noopener\"\u003e510366\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eWhile technically this was designed for the f\/8 system, through user experiences and our subsequent testing we have concluded that our 3-inch field flattener\/reducer performs very well with our f\/7.5 refractors.\u003c\/p\u003e\n\u003ch2 style=\"margin: 0px 0px 2em; font-family: Arial, Helvetica, sans-serif; font-weight: normal; line-height: 20px; color: rgb(34, 34, 34); text-rendering: optimizeLegibility; font-size: 14px; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(236, 229, 227); text-transform: uppercase; background-color: rgb(255, 255, 255);\"\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/h2\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44013211680879,"sku":"FFFR507X-00","price":553.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f1_1024x1024__16033.jpg?v=1766548832"},{"product_id":"explore-scientific-hr-variable-coma-corrector-with-adapters","title":"Explore Scientific HR Variable Coma Corrector 2-inch WITH M42 and M48 Camera Adapters","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Explore Scientific HR Variable Coma Corrector is a 2-inch corrector for Newtonian reflectors, designed by the optical designer Harrie Rutten and EMC coated to hold down internal reflections. This is item HRCC02-00, the version supplied \u003cstrong\u003ewith\u003c\/strong\u003e camera adapters: both an M42x0.75 and an M48x0.75 adapter are in the box, along with three thumbscrews and a protective cap. Explore Scientific publishes a weight of 1 lb (0.45 kg), a diameter of 69.3 mm and a height of 147.2 mm.\u003c\/p\u003e\u003cp\u003eExplore Scientific offers the same corrector without those adapters as item HRCC02-01, at a lower price. If you intend to screw a camera directly onto the corrector, this is the version to buy.\u003c\/p\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eAnyone imaging or observing with a fast parabolic Newtonian who is tired of comet-shaped stars in the corners. Coma is inherent to the paraboloid: it grows with distance from the optical axis and it grows fast as the focal ratio drops, so an f\/4 mirror shows it well inside the field of a 2-inch eyepiece while an f\/8 mirror mostly hides it. This corrector is the standard remedy, and Explore Scientific specifies it down to around f\/3.9.\u003c\/p\u003e\u003cp\u003eChoose this HRCC02-00 version if you are attaching a camera. The two threaded adapters are what let a DSLR or dedicated astro camera screw straight onto the corrector at a fixed, repeatable spacing, which is exactly what you want when you are trying to reproduce a working imaging train night after night.\u003c\/p\u003e\u003ch2\u003eKey Features \u0026amp; Design\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e2-inch coma corrector for parabolic Newtonian reflectors, specified for fast mirrors from around f\/3.9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes both M42x0.75 and M48x0.75 camera adapters\u003c\/strong\u003e for a direct screw-on camera connection\u003c\/li\u003e\n\u003cli\u003eOptical design by Harrie Rutten\u003c\/li\u003e\n\u003cli\u003eEMC coating to suppress internal reflections and ghosting on bright stars\u003c\/li\u003e\n\u003cli\u003eVariable spacer with markings, so the corrector can be set for different telescopes\u003c\/li\u003e\n\u003cli\u003eThree thumbscrews and a protective cap supplied\u003c\/li\u003e\n\u003cli\u003e1 lb (0.45 kg), 69.3 mm diameter, 147.2 mm tall\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eOptical Design\u003c\/h2\u003e\u003cp\u003eA parabolic mirror brings light to a sharp focus on axis and nowhere else. Off axis, rays striking different zones of the mirror land at slightly different places, and the resulting flare is coma: stars grow a one-sided tail that points away from field centre and lengthens the further out you look. Because the effect scales roughly as the inverse square of the focal ratio, halving the f-number quadruples the coma — which is why a fast Newtonian, the very telescope you want for wide-field imaging, is also the one that shows the aberration worst.\u003c\/p\u003e\u003cp\u003eThe corrector sits in the converging beam ahead of focus and applies an equal and opposite aberration, straightening those tails back into points. Its distance from the sensor or eyepiece field stop is what determines how completely it does that, and it is why the spacer is marked rather than fixed — different telescopes want different spacings, and the markings let you find yours and return to it. The EMC coating matters more here than on a simple accessory, because a multi-element group sitting in a converging beam is a good place to generate ghost images from bright stars if the surfaces are not properly treated.\u003c\/p\u003e\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDeep-sky imaging with a fast parabolic Newtonian, where corner stars would otherwise flare\u003c\/li\u003e\n\u003cli\u003eWide-field visual observing at low power in a fast Dobsonian, sharpening the field edge\u003c\/li\u003e\n\u003cli\u003eAny Newtonian imaging train where the camera needs to screw on at a fixed, repeatable spacing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\u003cp\u003eThis corrects coma; it is not a focal reducer and it will not shorten your focal length or speed up your system. It is designed for parabolic primary mirrors — Newtonians and Dobsonians — and is not intended for refractors, which need a field flattener instead. It fits a 2-inch focuser and needs enough in-travel to reach focus with the corrector and camera in place, which on some Newtonians means a low-profile focuser or a shortened tube. The M42x0.75 and M48x0.75 adapters supplied here cover both common camera thread standards, so you will still need a T-ring for your specific camera body but not a separate thread adapter. Tell us your telescope and camera and we will confirm the spacing and back-focus before you order.\u003c\/p\u003e\u003ch2\u003eGood to Know Before You Order\u003c\/h2\u003e\u003cp\u003eThe one decision to get right is which version you want. This HRCC02-00 comes with the M42 and M48 adapters. The cheaper HRCC02-01 is the identical corrector \u003cem\u003ewithout\u003c\/em\u003e them, and if you buy that one and later want a screw-on camera connection you will be sourcing adapters separately — which usually costs more than the difference between the two listings. Buy this one if a camera is anywhere in your plans. Note also that reaching focus with a corrector in the train is the commonest snag on Newtonians; if you have not used one on your telescope before, check your focuser travel or ask us.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between HRCC02-00 and HRCC02-01?\u003c\/strong\u003e The adapters. This version (HRCC02-00) includes M42x0.75 and M48x0.75 camera adapters. HRCC02-01 is the same corrector supplied without them, at a lower price.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on my f\/5 Dobsonian?\u003c\/strong\u003e Yes — it is designed for parabolic Newtonians and Explore Scientific specifies it for fast mirrors from around f\/3.9, so f\/5 is well within range. Reaching focus is the thing to check, not the optics.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it change my focal length?\u003c\/strong\u003e No. It corrects coma and leaves the focal ratio alone. If you want a shorter focal length you are after a focal reducer, which is a different product.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it visually?\u003c\/strong\u003e Yes. It sharpens stars at the edge of the field with wide-angle eyepieces at low power, though the gain is most obvious on fast mirrors.\u003c\/p\u003e\u003ch2\u003eBottom Line\u003c\/h2\u003e\u003cp\u003eThe Harrie Rutten HR coma corrector in its complete form — EMC coated, marked variable spacer, and both M42 and M48 camera adapters in the box. If you are imaging with a fast Newtonian, this is the version that saves you a second purchase. Send our Bolton team your telescope and camera and we will check the spacing with you.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44013213417583,"sku":"HRCC02-00","price":290.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/explore-scientific-es-hr-coma-corrector-telescope-house-0510330_2__40349.png?v=1766548839"},{"product_id":"baader-multi-purpose-coma-corrector","title":"Baader Multi Purpose Coma Corrector","description":"\u003ch3 style=\"box-sizing: border-box; margin: 0px 0px 0.75em; padding: 0px; font-size: 1.5em; color: rgb(235, 2, 53); font-family: \" open sans sans-serif optimizespeed rgb line-height:=\"\" text-rendering:=\"\" background-color:=\"\"\u003eBaader MPCC Mark III - Multi Purpose Newton Coma Corrector\u003c\/h3\u003e\u003ch4 style=\"box-sizing: border-box; margin: 0px 0px 0.75em; padding: 0px; font-size: 1.2em; color: rgb(99, 99, 99); font-family: \" open sans sans-serif optimizespeed rgb line-height:=\"\" text-rendering:=\"\" background-color:=\"\"\u003eThe only coma corrector for Newton telescopes, that neither reduces the focal length nor the image field of your telescope\u003c\/h4\u003e\u003cdiv class=\"leftImage\" style=\"box-sizing: border-box; margin: 0px 15px 1em 0px; padding: 0px; font-family: \" open sans sans-serif center top left rgb text-align:=\"\" vertical-align:=\"\" float:=\"\" clear:=\"\" color:=\"\" font-size:=\"\" background-color:=\"\" width:=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/mpcc-III-01-gross_8832a66f-428b-4226-afe5-fae3c998f9e0.jpg?v=1766551470\" alt=\"Baader MPCC Mark III - Multi Purpose Newton Coma Correktor T2\" title=\"Baader MPCC Mark III - Multi Purpose Newton Coma Correktor T2\" width=\"250\" style=\"box-sizing: border-box; margin: 0px; padding: 0px; border: none; display: block;\"\u003e\u003c\/div\u003e\u003cdiv class=\"rightImage\" style=\"box-sizing: border-box; margin: 0px 0px 1em 15px; padding: 0px; font-family: \" open sans sans-serif center top right rgb text-align:=\"\" vertical-align:=\"\" float:=\"\" clear:=\"\" color:=\"\" font-size:=\"\" background-color:=\"\" width:=\"\"\u003e\n\u003ca class=\"image-popup\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/mpcc_07_goss_1011cddf-6b46-495e-ae7d-d716c00036ab.jpg?v=1766551474\" target=\"_blank\" style=\"box-sizing: border-box; margin: 0px; padding: 0px; touch-action: manipulation; color: rgb(235, 2, 53); text-decoration: none; transition: all 0.2s;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/mpcc_07_goss_1011cddf-6b46-495e-ae7d-d716c00036ab.jpg?v=1766551474\" alt=\"MPCC MIII\" title=\"MPCC MIII\" width=\"300\" style=\"box-sizing: border-box; margin: 0px; padding: 0px; border: none; display: block;\"\u003e\u003c\/a\u003e\u003cdiv class=\"imageCaption\" style=\"box-sizing: border-box; margin: 0px; padding: 0.5em 0.5em 0px; clear: both; font-size: 0.846em;\"\u003eSingle parts of the MPCC MIII for visual + photographic use\u003cbr style=\"box-sizing: border-box; margin: 0px; padding: 0px;\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003cp style=\"box-sizing: border-box; margin: 0px 0px 1.5em; padding: 0px; font-family: \" open sans sans-serif rgb color:=\"\" font-size:=\"\" background-color:=\"\"\u003eLarge parabolic mirrors are perfectly apt for Deep Sky imaging since they deliver a very large field and enable very short exposure times. However this comes at the price of off axis coma and some residual astigmatism. Coma will distort off axis stars into \"comets\" which effectively reduces the usable field considerably. Many companys offer various lens systems as solution to counteract coma, most at the downside of increasing the original focal length and reducing the field of view. An f4 optics may become an f4.5\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; margin: 0px 0px 1.5em; padding: 0px; font-family: \" open sans sans-serif rgb color:=\"\" font-size:=\"\" background-color:=\"\"\u003eThe Multi Purpose Coma Corrector Mark III eliminates coma across the full photographic field without manipulating the focal length. The proprietory lens design has our Phantom Group  wideband multicoating on all air to glass lens surfaces. This treatment delivers highest transmission combined with lowest amount of scatter and reflections across a very wide spectral range from UV to NIR. The original MPCC had been designed for an f\/ratio of f4.5 to f6. The new Mark III however works exceptionally well even down to f3.5. Stars remain pinpoints across the field and the visual use likewise is made much easier - with the help of the 2\" (M48) male filter thread at the eyepiece facing side.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; margin: 0px 0px 1.5em; padding: 0px; font-family: \" open sans sans-serif rgb color:=\"\" font-size:=\"\" background-color:=\"\"\u003eThe MPCC III is designed to be the most variable coma corrector in the market today. It mounts into every 2\" focuser and fits CCD-filter wheels and off axis guiders of various manufacturers.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; margin: 0px 0px 1.5em; padding: 0px; font-family: \" open sans sans-serif rgb color:=\"\" font-size:=\"\" background-color:=\"\"\u003eWith the optional T-Spacer (# 245 8405) you will be able to couple the Mark III directly to the Baader Protective Canon DSLR adapter - with or without mounted various filter.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; margin: 0px 0px 1.5em; padding: 0px; font-family: \" open sans sans-serif rgb color:=\"\" font-size:=\"\" background-color:=\"\"\u003eThe MPCC MIII Version for either visuell or photographic use contains of the following parts, otherwise see the common description for the MPCC above.\u003c\/p\u003e\u003ch3 style=\"box-sizing: border-box; margin: 0px 0px 0.75em; padding: 0px; font-size: 1.5em; color: rgb(235, 2, 53); font-family: \" open sans sans-serif optimizespeed rgb line-height:=\"\" text-rendering:=\"\" background-color:=\"\"\u003eTechnical data of MPCC Mark III\u003c\/h3\u003e\u003cul style=\"box-sizing: border-box; margin: 0px 0px 1em; padding: 0px; list-style-position: initial; list-style-image: initial; font-family: \" open sans sans-serif rgb color:=\"\" font-size:=\"\" background-color:=\"\"\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eno change in focal length or field size, an f4 Newtonian remains f4.\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003enewly calculated lens system - designed for an unvignetted field down to f3.5\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003emaximum sharpness across the field - without center soft spot (as reported of other)\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eaccepts T-2(M42x0.75) and\/or 2\"(M48x0.75) threaded photographic- or visual-adapters\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003e2\" stopping collar removable for increase in backfocus\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eFor photographic and visual use\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eeasy to use\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eexceptional price\/performance ratio\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003ePhantom Group  multicoated for maximum transmission and freedom from reflections from UV to NIR\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eOptional adapter for direct coupling of the MPCC III directly onto the Baader CANON EOS protective T-ring\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003e44mm clear aperture when using the M48(2\") filter-tread or the Protective T-ring with optional adapter\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"leftImage\" style=\"box-sizing: border-box; margin: 0px 15px 1em 0px; padding: 0px; font-family: \" open sans sans-serif center top left rgb text-align:=\"\" vertical-align:=\"\" float:=\"\" clear:=\"\" color:=\"\" font-size:=\"\" background-color:=\"\" width:=\"\"\u003e\u003ca class=\"image-popup\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/mpcc-III-02-gross_63e1bf8b-ef23-43ff-a6e3-f6d3543a38e7.jpg?v=1766551478\" target=\"_blank\" style=\"box-sizing: border-box; margin: 0px; padding: 0px; touch-action: manipulation; color: rgb(235, 2, 53); text-decoration: none; transition: all 0.2s;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/mpcc-III-02-gross_63e1bf8b-ef23-43ff-a6e3-f6d3543a38e7.jpg?v=1766551478\" alt=\"Koma Korrektor\" title=\"Koma Korrektor\" width=\"250\" style=\"box-sizing: border-box; margin: 0px; padding: 0px; border: none; display: block;\"\u003e\u003c\/a\u003e\u003c\/div\u003e\u003cdiv class=\"leftImage\" style=\"box-sizing: border-box; margin: 0px 15px 1em 0px; padding: 0px; font-family: \" open sans sans-serif center top left none rgb text-align:=\"\" vertical-align:=\"\" float:=\"\" clear:=\"\" color:=\"\" font-size:=\"\" background-color:=\"\" width:=\"\"\u003e\u003ca class=\"image-popup\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/mpcc-III-03-gross_9392f11e-4298-41f8-bcbf-31e78e638bb3.jpg?v=1766551482\" target=\"_blank\" style=\"box-sizing: border-box; margin: 0px; padding: 0px; touch-action: manipulation; color: rgb(235, 2, 53); text-decoration: none; transition: all 0.2s;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/mpcc-III-03-gross_9392f11e-4298-41f8-bcbf-31e78e638bb3.jpg?v=1766551482\" alt=\"Koma Korrektor\" title=\"Koma Korrektor\" width=\"250\" style=\"box-sizing: border-box; margin: 0px; padding: 0px; border: none; display: block;\"\u003e\u003c\/a\u003e\u003c\/div\u003e\u003cdiv class=\"leftImage\" style=\"box-sizing: border-box; margin: 0px 15px 1em 0px; padding: 0px; font-family: \" open sans sans-serif center top left none rgb text-align:=\"\" vertical-align:=\"\" float:=\"\" clear:=\"\" color:=\"\" font-size:=\"\" background-color:=\"\" width:=\"\"\u003e\u003ca class=\"image-popup\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/mpcc-III-04-gross_826eeb43-7ba8-497d-99a1-b1d430cd7524.jpg?v=1766551485\" target=\"_blank\" style=\"box-sizing: border-box; margin: 0px; padding: 0px; touch-action: manipulation; color: rgb(235, 2, 53); text-decoration: none; transition: all 0.2s;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/mpcc-III-04-gross_826eeb43-7ba8-497d-99a1-b1d430cd7524.jpg?v=1766551485\" alt=\"Koma Korrektor\" title=\"Koma Korrektor\" width=\"250\" style=\"box-sizing: border-box; margin: 0px; padding: 0px; border: none; display: block;\"\u003e\u003c\/a\u003e\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44013368639599,"sku":"MPCC","price":289.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2-mpcc-mark-iii-multi-purpose-coma-corrector-for-newtons-d28__76708.jpg?v=1766551487"},{"product_id":"celestron-f-6-3-reducer-corrector","title":"Celestron f\/6.3 reducer\/corrector","description":"\u003cp class=\"MsoSubtitle\"\u003e\u003cspan style=\"font-size:12.0pt;mso-bidi-font-size:13.5pt; font-family:\" arial\u003eThis combination focal reducer and field corrector lens accessory works with all Celestron 5\", 6\", 8\", 9 1\/4\", 11\" and 14\" Schmidt-Cassegrain telescopes. This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality. The Reducer\/Corrector is f\/6.3 for C5, C6, C8, C9¼ and C11 telescopes and f\/7 for the C14 telescope.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoSubtitle\" style=\"box-sizing: border-box\"\u003e\u003cspan style=\"font-size: 12.0pt;mso-bidi-font-size:13.5pt;font-family:\" arial\u003eIf offers wide fields of view with any Schmidt-Cassegrain telescope. Used for astrophotography, it reduces exposure time by a factor of 3.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoSubtitle\" style=\"box-sizing: border-box\"\u003e\u003cspan style=\"font-size: 12.0pt;mso-bidi-font-size:13.5pt;font-family:\" arial\u003eCelestron doesn t offer a f\/6.3 Schmidt-Cassegrain telescope, because the design is impractical, with a large central obstruction, and resulting loss in contrast. This, added to the inability to utilize longer focal ratios for certain objects, led Celestron to design the four-element, fully multicoated f\/6.3 Reducer\/Corrector. Results are amazing both visually and photographically.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoSubtitle\" style=\"box-sizing: border-box\"\u003e\u003cstrong style=\"box-sizing: border-box\"\u003e\u003cspan style=\"font-size: 12pt; font-family: Arial, sans-serif; color: windowtext; text-transform: uppercase; font-weight: bold;\"\u003eTHE #94175 REDUCER\/CORRECTOR LENS IS NOT COMPATIBLE WITH CELESTRON EDGEHD OPTICAL SYSTEMS.\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-size:12.0pt;mso-bidi-font-size:13.5pt;font-family:\" arial color:windowtext\u003e\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013369000047,"sku":"94175","price":277.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/94175_reducer_corrector_01__43927.jpg?v=1766551540"},{"product_id":"edgehd-1100-7x-focal-reducer-lens","title":"EdgeHD 1100 .7x Focal Reducer Lens","description":"\u003ch1\u003e\u003cspan style=\"font-family:\" arial new roman\u003eOverview\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h1\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eThe EdgeHD      .7x Focal Reducer Lens Makes Your EdgeHD 1100 One Full F-Stop Faster Than      f\/10, Reducing Your Exposure Time by One-Half to Capture the Same      Brightness of Object\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003e5-element      lens design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eMaintains      similar flat-field performance as native Edge HD optical design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eIncreases      Field of View by 43% to Better Capture Wide Field Images\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eThreads      Directly onto the 3.25\" threads of the EdgeHD which Reduces      Mechanical Vignetting and Allows for use with Larger (Full Frame) Sensors      and Off-Axis Guiders\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eMaintains      the Identical Back Focus When Used at F\/10 and Provides Generous Back      Focus to Accommodate Additional Accessories and Wide Variety of Cameras\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eAllows Use      of Existing EdgeHD T-adapters With or Without the Reducer Lens\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e  \u003ch1\u003e\u003cspan style=\"font-family:\" arial new roman\u003eDescription\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h1\u003e  \u003cp\u003e\u003cspan style=\"font-family:\" arial\u003eCelestron s new EdgeHD reducers feature a custom 5 element optical design engineered to maintain the flat-field performance of our award winning EdgeHD optical system.  Unlike generic reducers, our premium reducers provide substantial back focus to accommodate an assortment of imaging accessories.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003cspan style=\"font-family:\" arial\u003eEdgeHD reducers offer high index optical elements, including extra low dispersion, exotic Lanthanum elements, which provide high contrast viewing while minimizing chromatic aberration.  All air to glass lens surfaces feature multiple layers of coating for maximum light transmission and color correction and contain blacken edges to minimize internal reflection and maximize image contrast.  Large diameter lens elements, up to 60 mm clear aperture, ensure that the optimized image circle remains at a generous 42 mm for use with large CCD sensors. \u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003cspan style=\"font-family:\" arial\u003eIncorporating computer assisted CNC machined aluminum housing, for precise spacing and alignment of optical elements, and threaded metal covers on the lens assembly to protect your investment from dust and scratches, our reducers offer you an outstanding mechanical design.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003cspan style=\"font-family:\" arial\u003eWith the fastar option on all EdgeHD optical systems, coupled with the .7x reducer, your telescope becomes the most complete imaging system available in its price range today.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003ch3\u003e\u003cspan style=\"font-family:\" arial new roman\u003ePerformance\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h3\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eDesign:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial new roman\u003e      5-element optical layout designed specifically for the EdgeHD11\" to      maintain the flat-field performance of the Edge HD optical design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eMaintains      the same back focus as when used at F\/10:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial new roman\u003e      Unlike generic reducers the EdgeHD .7x provides generous back focus to      accommodate additional accessories and a wide variety of cameras. Also      allows use of existing EdgeHD T-adapters and other Celestron imaging      accessories\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eOne      full F-Stop faster than f\/10:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:      \" arial new roman\u003e Reduces the      exposure time by one-half to capture the same brightness of object\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003e Increase      field of view by 43%: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003eBetter for capturing wide field      images of larger galaxies and nebulae\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e \u003c\/ul\u003e  \u003ch3\u003e\u003cspan style=\"font-family:\" arial new roman\u003eGlass\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h3\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eLanthanum      Glass Elements: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003eEdgeHD reducer uses \"rare      earth\" Lanthanum glass elements for clear, high contrast viewing      while minimizing chromatic aberration\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eFully      multi-coated lens elements:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003e All air-to-glass surfaces have      multiple layers of coating for maximum light transmission and color      correction\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eBlacken      edges:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003e All lens elements have blacken      edges to minimize internal reflection and maximize contrast\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e \u003c\/ul\u003e  \u003ch3\u003e\u003cspan style=\"font-family:\" arial new roman\u003eFull Frame Design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h3\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eThreads      directly onto the 3.25\" threads of the EdgeHD optical tube: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eReduces      mechanical vignetting and allows for use with larger (full frame) sensors      and Off-Axis Guiders\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eClear      aperture: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003e60mm clear aperture lens      optimized for a 42 mm image circle for use with large CCD sensors.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e \u003c\/ul\u003e  \u003ch3\u003e\u003cspan style=\"font-family:\" arial new roman\u003eMechanical Design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h3\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eMachined      aluminum housing: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003eComputer assisted CNC machined      aluminum housing for precise spacing and alignment of the optical      elements.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eThreaded      metal covers for both ends of the lens assembly: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eTo      protect your investment from unwanted dust and scratches.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e \u003c\/ul\u003e  \u003ch3\u003e\u003cspan style=\"font-family:\" arial new roman\u003eVersatility\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h3\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:12.0pt;      mso-list:l2 level1 lfo6;tab-stops:list .5in\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eFastar      compatibility and f\/2 imaging with optional accessory: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial new roman\u003ethe      EdgeHD is the most complete imaging system in its price range.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013376110703,"sku":"94241","price":1180.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/94241_252520Reducer_252520Lens_2525201100_01__18183.1682640057.1280.1280.jpg?v=1766552122"},{"product_id":"starfield-0-8x-reducer-and-field-flattener","title":"Starfield - 0.8x Reducer and Field Flattener","description":"\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Starfield 0.8x Reducer doubles as a field flattener.   The unique optical accessory is a must for anyone that is imaging with a DSLR or dedicated astronomy camera.  What makes this reducer different over all the others?   The M42 connection is removable and can be replaced with an optional M48 threaded adapter for Full Frame camera's. \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eProviding pin point stars across the field of view, the Starfield 0.8x reducer\/flattener decrease the focal length of your imaging refractor.   Designed to be used with any refractor, f\/5.5 and longer, with a 2\" focuser, and requires 55mm of back focus.  Perfect for any DSLR imager.  No additional extension rings are required.  With 38mm's of clear aperture the chance of vignetting is removed, and is well suited for APS-C sized and smaller sensors.  A 42mm clear aperture when the optional 48mm T-Ring adapter is used.  Your imaging sessions will benefit with shorter exposure times and a larger field of view.  A standard 10mm T-Ring is required.  \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eMulti-coated optics housed in a high polish, and hard anodize finished aluminum body to help reduce weight.  This all metal constructed accessory will look like jewelry for your telescope.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eIncludes standard M42 T thread for camera connection, and 48mm filter thread to add your favorite light pollution filter.    \u003c\/span\u003e\u003c\/p\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":44013398687855,"sku":"SF-FFR08","price":199.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/starfield1__44679.jpg?v=1766552965"},{"product_id":"reducer-lens-7x-edgehd-925","title":"REDUCER LENS .7X - EDGEHD 925","description":"\u003cp class=\"MsoNormal\" style=\"margin-bottom:11.25pt;line-height:normal\"\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eCelestron’s new EdgeHD reducers feature a custom 4-element optical design engineered to maintain the flat-field performance of our award winning EdgeHD optical system. Unlike generic reducers, our premium reducers provide substantial back focus to accommodate an assortment of imaging accessories.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-bottom:11.25pt;line-height:normal\"\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eEdgeHD reducers offer high index optical elements, including extra low dispersion, exotic Lanthanum elements, which provide high contrast viewing while minimizing chromatic aberration. All air to glass lens surfaces feature multiple layers of coating for maximum light transmission and color correction and contain blacken edges to minimize internal reflection and maximize image contrast. Large diameter lens elements, up to 60 mm clear aperture, ensure that the optimized image circle remains at a generous 42 mm for use with large CCD sensors.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-bottom:11.25pt;line-height:normal\"\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eIncorporating computer assisted CNC machined aluminum housing, for precise spacing and alignment of optical elements, and threaded metal covers on the lens assembly to protect your investment from dust and scratches, our reducers offer you an outstanding mechanical design.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-bottom:11.25pt;line-height:normal\"\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eWith the fastar option on all EdgeHD optical systems, coupled with the .7x reducer, your telescope becomes the most complete imaging system available in its price range today.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-top:11.25pt;margin-right:0in;margin-bottom: 6.0pt;margin-left:0in;line-height:normal;mso-outline-level:3\"\u003e\u003cspan style=\"font-size: 13.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003ePerformance\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l1 level1 lfo1; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eDesign:\u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e 4-element optical layout designed specifically for the \u003ca href=\"https:\/\/www.celestron.com\/products\/edgehd-925-optical-tube-assembly\"\u003eEdgeHD 9.25\"\u003c\/a\u003e to maintain the flat-field performance of the EdgeHD optical design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l1 level1 lfo1; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eMaintains the same back focus as when used at f\/10:\u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e Unlike generic reducers the EdgeHD .7x provides generous back focus to accommodate additional accessories and a wide variety of cameras. Also allows use of existing EdgeHD T-Adapters and other Celestron imaging accessories\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l1 level1 lfo1; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eOne full F-Stop faster than f\/10:\u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e Reduces the exposure time by one-half to capture the same brightness of object\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l1 level1 lfo1; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eIncrease field of view by 43%: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eBetter for capturing wide field images of larger galaxies and nebulae\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-top:11.25pt;margin-right:0in;margin-bottom: 6.0pt;margin-left:0in;line-height:normal;mso-outline-level:3\"\u003e\u003cspan style=\"font-size: 13.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eGlass\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l0 level1 lfo2; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eLanthanum Glass Elements: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eEdgeHD reducer uses \"rare earth\" Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l0 level1 lfo2; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eFully multi-coated lens elements:\u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l0 level1 lfo2; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eBlacken edges:\u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e All lens elements have blacken edges to minimize internal reflection and maximize contrast\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-top:11.25pt;margin-right:0in;margin-bottom: 6.0pt;margin-left:0in;line-height:normal;mso-outline-level:3\"\u003e\u003cspan style=\"font-size: 13.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eFull Frame Design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l2 level1 lfo3; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eThreads directly onto the 3.25\" threads of the EdgeHD optical tube: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eReduces mechanical vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l2 level1 lfo3; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eClear aperture: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e60 mm clear aperture lens optimized for a 42 mm image circle for use with large CCD sensors.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-top:11.25pt;margin-right:0in;margin-bottom: 6.0pt;margin-left:0in;line-height:normal;mso-outline-level:3\"\u003e\u003cspan style=\"font-size: 13.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eMechanical Design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l4 level1 lfo4; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eMachined aluminum housing: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eComputer assisted CNC machined aluminum housing for precise spacing and alignment of the optical elements.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l4 level1 lfo4; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eThreaded metal covers for both ends of the lens assembly: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eTo protect your investment from unwanted dust and scratches.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-top:11.25pt;margin-right:0in;margin-bottom: 6.0pt;margin-left:0in;line-height:normal;mso-outline-level:3\"\u003e\u003cspan style=\"font-size: 13.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eVersatility\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l3 level1 lfo5; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eFastar compatibility and f\/2 imaging with optional accessory: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003ethe EdgeHD is the most complete imaging system in its price range.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\"\u003e\u003co:p\u003e \u003c\/o:p\u003e\u003c\/p\u003e\u003cbr class=\"innova\"\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013399900271,"sku":"94245","price":610.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/94245_Reducer_Lens_EdgeHD_925_1_d67fe260-82bd-4117-9da2-231488df5781_570x3802x__74743.jpg?v=1766553238"},{"product_id":"explore-scientific-adapter-for-fffr507x-00-to-2-5-hex-focuser","title":"Explore Scientific Adapter for FFFR507X-00 0.7x Corrector to 2.5-Inch Hex Focuser","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is the Explore Scientific mechanical adapter that joins the FFFR507X-00 3-inch 0.7x field flattener and focal reducer to a 2.5-inch hex focuser. It carries no optical elements of its own. Its entire job is to hold two components of different diameters concentric, square to the optical axis, and at whatever spacing the corrector was designed for — which, in an imaging train, is the difference between round stars in the corners and elongated ones.\u003c\/p\u003e\n\u003cp\u003eThe FFFR507X-00 is a 3-inch corrector, sized for the larger focusers fitted to Explore Scientific's bigger refractors. A 2.5-inch hex focuser has a smaller drawtube, so on its own the corrector has nothing to seat against. The adapter is the interface that makes that pairing mechanically possible.\u003c\/p\u003e\n\u003cp\u003eExplore Scientific does not publish a specification table for this item — no dimensions, no thread callouts, no weight and no optical path length. Everything below that is not in their data is stated as unpublished rather than estimated, and we are glad to take a specific question to our Explore Scientific contact on your behalf.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOwners of the FFFR507X-00 3″ 0.7x corrector\u003c\/strong\u003e who want to use it on a telescope fitted with a 2.5-inch hex focuser rather than a 3-inch one.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImagers assembling a fixed, repeatable optical train,\u003c\/strong\u003e where a purpose-made adapter is more rigid and more concentric than a stack of general-purpose rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnyone who has changed focusers or telescopes\u003c\/strong\u003e and needs to carry an existing corrector across to the new setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eObservers troubleshooting corner star shapes,\u003c\/strong\u003e where a mechanical mismatch in the train is one of the usual causes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurpose-built interface:\u003c\/strong\u003e made specifically for the FFFR507X-00 to 2.5-inch hex focuser pairing rather than adapted from a generic ring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical only:\u003c\/strong\u003e no lenses and no coatings, so it introduces no aberrations of its own and needs no cleaning regime beyond keeping the mating faces clean.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcentricity and squareness:\u003c\/strong\u003e the two functions that matter in an adapter. A part machined for a specific pair holds the corrector on-axis more reliably than a chain of step rings does.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed geometry:\u003c\/strong\u003e a single machined part contributes one known length to the train rather than the accumulated tolerance of several stacked components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart of the Explore Scientific accessory line,\u003c\/strong\u003e so the mating dimensions are drawn from the same drawings as the focuser and the corrector it joins.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFitting the FFFR507X-00 3-inch 0.7x reducer and flattener onto a 2.5-inch hex focuser.\u003c\/li\u003e\n\u003cli\u003eBuilding a deep-sky imaging train that reduces focal length and flattens the field in one component.\u003c\/li\u003e\n\u003cli\u003eMoving an existing corrector between telescopes with different focuser sizes.\u003c\/li\u003e\n\u003cli\u003eReplacing an improvised stack of step rings with a single machined interface.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrector side:\u003c\/strong\u003e made for the Explore Scientific FFFR507X-00, the 3-inch 0.7x field flattener and focal reducer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocuser side:\u003c\/strong\u003e made for the 2.5-inch hex focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpacing matters downstream of it.\u003c\/strong\u003e A reducer and flattener has a designed distance from its rear surface to the sensor, and that distance is set by the parts that follow the adapter — the camera, the filter wheel, any spacer rings. If you send us the camera and any filter wheel or off-axis guider you plan to use, we will work through the spacing with you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters in the train add optical path.\u003c\/strong\u003e Glass in the light path shifts focus slightly, which is one of the more common reasons a train that measures correctly still does not quite deliver. It is straightforward to allow for once it is accounted for.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific publishes no thread specification, length or weight\u003c\/strong\u003e for this adapter, so those rows read as unpublished below. For a specific figure, ask us and we will take it to our Explore Scientific contact before you commit to an order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther correctors:\u003c\/strong\u003e this part is specified for the FFFR507X-00. If you have a different flattener or reducer in mind, send us the model and we will look at whether the interface suits it.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is a mechanical adapter, not a corrector.\u003c\/strong\u003e The optical work is done by the FFFR507X-00; this part positions it. Both are needed for the pairing, and we can supply them together.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific publishes no specification table for it.\u003c\/strong\u003e No dimensions, thread callouts, optical path length or weight appear on their product page, so the table below records those rows as unpublished rather than estimated. If a figure decides the purchase for you, ask and we will get it from our Explore Scientific contact first.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack-focus is the specification that governs the result.\u003c\/strong\u003e The adapter contributes a fixed length; the remainder of the distance to the sensor comes from spacers and from the camera itself. Sending us the full list of what sits behind the corrector is the quickest way to get that right the first time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is a narrow-purpose part.\u003c\/strong\u003e It exists for one corrector and one focuser size, which is precisely why it fits well. For any other combination, we would rather check the fit with you than have the wrong part arrive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNothing else is required to use it\u003c\/strong\u003e beyond the corrector and the focuser it was made for — there is no separate clamp, ring or tool involved.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo — it is a single machined part that goes between the corrector and the focuser and then stays there. There is nothing to align, collimate or calibrate on the adapter itself. The one job that repays a few minutes is measuring the spacing from the back of the corrector to your camera sensor, and we will happily work that out with you.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it contain any glass?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. It is purely mechanical, so it adds no aberrations, no reflections and no light loss of its own.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the FFFR507X-00 do?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is a 3-inch field flattener and 0.7x focal reducer. It flattens the curved focal plane that a refractor naturally produces, so stars stay round toward the corners of a sensor, and it shortens the effective focal length to 0.7 of its native value — a wider field and a faster focal ratio at the same time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it change my back-focus?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAny component in the train contributes length, and this one is no exception. Explore Scientific does not publish its optical path length, so we are not going to quote a figure. Send us the parts list for your train and we will work the spacing through with you.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it fit other Explore Scientific focusers?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is specified for the 2.5-inch hex focuser. If your telescope has a different focuser, send us the model and we will check the interface for you before you order.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs a camera adapter included?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. This part joins the corrector to the focuser; the connection from the corrector to your camera is a separate item, chosen to suit the camera and the spacing your train needs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe FFFR507X-00 it supports is an imaging corrector, so the pairing is aimed at cameras. It is mechanically harmless in a visual train, though there is little for it to do there.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a mechanical adapter that lets the Explore Scientific FFFR507X-00 3-inch 0.7x flattener and reducer sit on a 2.5-inch hex focuser, with no optics of its own and one job to do properly. Explore Scientific publishes no dimensions for it, so if you would like exact figures before you order, or help laying out the spacing between the corrector and your camera, send us the list of what is in your imaging train and we will map it out with you.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44013400981615,"sku":"510366","price":138.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ES_0510366_2_3000x__04467.jpg?v=1766553257"},{"product_id":"explore-scientific-2-3x-focal-extender","title":"Explore Scientific 3x 2-Inch Telecentric Focal Extender","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Explore Scientific FE03-020 is a 3x focal extender in the 2-inch format, 125mm long and 66mm wide. Explore Scientific list its weight two ways — 22 oz on the specification table and 1.7 lbs. on the product page — and both figures are reproduced verbatim below rather than reconciled by us.\u003c\/p\u003e\n\u003cp\u003eA focal extender does what a Barlow does, by a different optical route. It multiplies the effective focal length of the telescope by three, which triples the magnification of whatever eyepiece sits behind it and multiplies the working focal ratio by the same factor. A 1000mm f\/8 telescope becomes an effective 3000mm at f\/24. A 24mm eyepiece behaves as an 8mm, taking that telescope from 42x to 125x. A 30mm becomes an effective 10mm at 100x.\u003c\/p\u003e\n\u003cp\u003eWhat separates this from a conventional Barlow is the telecentric design. Explore Scientific describe it as using multiple precision lens elements to deliver light rays that remain parallel to the optical axis, which means the magnification factor stays at 3x regardless of how far the eyepiece or camera sits behind it. A simple negative-lens Barlow does not behave that way: its amplification climbs as the spacing grows, so a diagonal or a filter drawer between Barlow and eyepiece changes the factor. Here it does not.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary and lunar observers:\u003c\/strong\u003e 3x turns a comfortable medium-power eyepiece into a high-power one without giving up its eye relief or apparent field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOwners of ultra-wide 2-inch eyepieces:\u003c\/strong\u003e tripling a 24mm or 30mm ultra-wide gives high magnification with the eye position and field of the original eyepiece, which is not something a short focal-length eyepiece can offer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary imagers:\u003c\/strong\u003e a fixed 3x that does not drift with spacing makes the image scale predictable when a camera sits at an arbitrary distance behind it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnyone consolidating an eyepiece case:\u003c\/strong\u003e one extender effectively doubles the number of magnifications a set of eyepieces provides.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3x magnification factor:\u003c\/strong\u003e triples the effective focal length of the telescope and the magnification of every eyepiece used with it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelecentric optical design:\u003c\/strong\u003e multiple precision elements arranged so that emerging rays run parallel to the optical axis, holding the factor at 3x independent of spacing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEMD (Enhanced Multi-Layer Deposition) coatings:\u003c\/strong\u003e applied to the lens surfaces to raise transmission and suppress internal reflection through what is a multi-element optical train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge-blackened elements:\u003c\/strong\u003e the ground edges of the lenses are blackened so that stray light striking them is absorbed rather than scattered into the image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.0-inch barrel:\u003c\/strong\u003e fits 2-inch focusers and diagonals, and takes 2-inch eyepieces and camera adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e125mm long, 66mm wide:\u003c\/strong\u003e the published physical dimensions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePublished weight:\u003c\/strong\u003e 22 oz on the specification table, 1.7 lbs. on the product page — both from Explore Scientific.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eA conventional Barlow lens is a negative element placed in the converging beam ahead of focus. It slows the convergence, moving the focal plane further back and increasing the effective focal length. The amplification depends on where the negative element sits relative to the new focal plane, which is why a Barlow's marked factor is only accurate at one particular spacing. Insert a star diagonal, a filter drawer or an extension tube behind it and the true factor rises above the number printed on the barrel.\u003c\/p\u003e\n\u003cp\u003eA telecentric design solves that by adding positive elements after the negative group, arranged so that the chief rays leave the assembly parallel to the optical axis rather than diverging. Once the beam is telecentric, moving the eyepiece or the camera sensor backwards changes the back focus but not the amplification. Three times is three times, whether the eyepiece is seated directly in the extender or sitting behind a diagonal.\u003c\/p\u003e\n\u003cp\u003eThat property matters for more than convenience. In imaging, a predictable image scale is what allows a calculated pixel scale to be trusted, and it makes the combination of extender, filter wheel and camera a matter of achieving focus rather than recalculating magnification. The cost of a telecentric group is element count and, therefore, air-to-glass surfaces — which is where the EMD coatings and blackened element edges do their work, and why a telecentric extender is a physically larger object than a simple Barlow of the same nominal power.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-power lunar and planetary observing using medium focal-length eyepieces.\u003c\/li\u003e\n\u003cli\u003eSplitting close double stars in apertures that can support the magnification.\u003c\/li\u003e\n\u003cli\u003ePlanetary and lunar imaging, where the fixed amplification keeps image scale predictable.\u003c\/li\u003e\n\u003cli\u003eExtending the useful range of an existing 2-inch eyepiece set without buying short focal lengths.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits 2-inch focusers and diagonals.\u003c\/strong\u003e Eyepieces and camera adapters in the 2-inch format go into the top of it. A 1.25-inch eyepiece can be used through a 2-inch to 1.25-inch adapter, which we stock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffective focal length:\u003c\/strong\u003e multiply your telescope's focal length by three. A 750mm Newtonian becomes 2250mm; a 1900mm Maksutov becomes 5700mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffective focal ratio:\u003c\/strong\u003e also multiplied by three. An f\/5 telescope works at f\/15 behind this extender, which is worth knowing for exposure planning in imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye relief:\u003c\/strong\u003e unchanged. The eyepiece behaves as a shorter focal length while keeping its own eye relief and apparent field, which is the main reason observers use an extender rather than buying a very short eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocus travel:\u003c\/strong\u003e adding 125mm of optical train ahead of the eyepiece shifts the focus position outward. Most 2-inch focusers have the travel for it; a telescope already near the end of its inward travel is the one case where it is worth checking, and we can look at that with you.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3x is a large step.\u003c\/strong\u003e On a 200mm telescope, a 24mm eyepiece behind this extender produces a magnification most nights of average seeing will not support. It is an eyepiece-case tool for the steady nights rather than an every-session accessory — and on those nights it is exactly the right thing to reach for.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is a substantial piece of hardware.\u003c\/strong\u003e Explore Scientific publish 22 oz on the specification table and 1.7 lbs. on the product page. Either way, with a 2-inch eyepiece on top of it there is real mass hanging off the focuser, so the drawtube tension is worth setting firmly. A focuser upgrade is the answer where the existing one cannot hold it, and we can advise on that.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is 2-inch only.\u003c\/strong\u003e Telescopes with 1.25-inch focusers cannot take it directly; the 1.25-inch focal extenders in the same range are the ones that suit those.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific does not publish the element count or an optical-length figure for this extender,\u003c\/strong\u003e so those rows are absent rather than estimated. For an imaging train where backfocus has to be calculated, send us the camera and spacers you are working with and we will sort the arithmetic out with you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification has a ceiling set by aperture.\u003c\/strong\u003e Roughly twice the aperture in millimetres is the practical limit, and 3x reaches it quickly in smaller instruments. Pairing the extender with a longer eyepiece rather than a short one is how most observers keep it in useful territory.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. It goes into the 2-inch focuser or diagonal, and the eyepiece or camera adapter goes into it. Refocusing after fitting it is the only step, and there is nothing to align or adjust.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is this different from a Barlow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA Barlow's amplification changes with the distance to the eyepiece, so its marked factor is only correct at one spacing. This is a telecentric design: the rays leave it parallel to the axis, so it stays at 3x whether the eyepiece is seated directly in it or sitting behind a diagonal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat magnification will I get?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThree times whatever the eyepiece gives on its own. A 24mm eyepiece in a 1000mm telescope gives 42x by itself and 125x through the extender.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it change eye relief?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, and that is the point of using one. The eyepiece keeps its own eye relief and apparent field while behaving as a focal length three times shorter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it work with 1.25-inch eyepieces?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, using a 2-inch to 1.25-inch adapter in the top of it. The extender itself needs a 2-inch focuser or diagonal to sit in.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a 2-inch telecentric 3x focal extender with EMD coatings and blackened element edges, holding its amplification constant regardless of spacing and leaving the eyepiece's eye relief untouched. If you would like to know which of your eyepieces will still be useful behind it on your telescope, send us the focal length and aperture and we will run the numbers for you.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44013457834095,"sku":"FE03-020","price":249.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FE03-020_1_1663x__55386.jpg?v=1766553521"},{"product_id":"reducer-lens-7x-edgehd-800","title":"REDUCER LENS .7X - EDGEHD 800","description":"\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eCelestron’s new EdgeHD reducers features a custom 4 element optical design engineered to maintain the flat-field performance of our award winning EdgeHD optical system. Unlike generic reducers, our premium reducers provide substantial back focus to accommodate an assortment of imaging accessories.\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eEdgeHD reducers offer high index optical elements, including extra low dispersion, exotic Lanthanum elements, which provide high contrast viewing while minimizing chromatic aberration. All air to glass lens surfaces feature multiple layers of coating for maximum light transmission and color correction and contain blacken edges to minimize internal reflection and maximize image contrast.\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eIncorporating computer assisted CNC machined aluminum housing, for precise spacing and alignment of optical elements, and threaded metal covers on the lens assembly to protect your investment from dust and scratches, our reducers offer you an outstanding mechanical design.\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eWith the Fastar option on all EdgeHD optical systems, coupled with the .7x reducer, your telescope becomes the most complete imaging system available in its price range today.\u003c\/p\u003e\u003ch3 style=\"box-sizing: inherit; margin: 15px 0px 0.5em; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif\u003ePerformance\u003c\/h3\u003e\u003cul style=\"box-sizing: inherit; margin: 15px 0px; padding: 0px; list-style: none; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eDesign:\u003c\/span\u003e 4-element optical layout designed specifically for the EdgeHD 8\" to maintain the flat-field performance of the EdgeHD optical design\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003e105 mm of back focus:\u003c\/span\u003e Provides generous back focus to accommodate additional accessories and a wide variety of cameras. Also allows use of existing T-Adapters for EdgeHD 800 and other Celestron imaging accessories\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eOne full F-Stop faster than f\/10:\u003c\/span\u003e Reduces the exposure time by one-half to capture the same brightness of object\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eIncrease field of view by 43%: \u003c\/span\u003eBetter for capturing wide field images of larger galaxies and nebulae\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"box-sizing: inherit; margin: 15px 0px 0.5em; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif\u003eGlass\u003c\/h3\u003e\u003cul style=\"box-sizing: inherit; margin: 15px 0px; padding: 0px; list-style: none; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eLanthanum Glass Elements: \u003c\/span\u003eEdgeHD reducer uses \"rare earth\" Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eFully multi-coated lens elements:\u003c\/span\u003e All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eBlacken edges:\u003c\/span\u003e All lens elements have blacken edges to minimize internal reflection and maximize contrast\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 class=\"p1\" style=\"box-sizing: inherit; margin: 15px 0px 0.5em; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif\u003eLarge Illuminated Field\u003c\/h3\u003e\u003cul style=\"box-sizing: inherit; margin: 15px 0px; padding: 0px; list-style: none; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003e\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eOptimized for APS-C sized sensors: \u003c\/span\u003eIncluding most DSLR cameras and Nightscape CCD cameras\u003c\/li\u003e\u003c\/ul\u003e\u003ch3 style=\"box-sizing: inherit; margin: 15px 0px 0.5em; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif\u003eMechanical Design\u003c\/h3\u003e\u003cul style=\"box-sizing: inherit; margin: 15px 0px; padding: 0px; list-style: none; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eMachined aluminum housing: \u003c\/span\u003eComputer assisted CNC machined aluminum housing for precise spacing and alignment of the optical elements.\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eThreaded metal covers for both ends of the lens assembly: \u003c\/span\u003eTo protect your investment from unwanted dust and scratches.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"box-sizing: inherit; margin: 15px 0px 0.5em; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif\u003eVersatility\u003c\/h3\u003e\u003cul style=\"box-sizing: inherit; margin: 15px 0px; padding: 0px; list-style: none; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003e\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eProvides and intermediate focal length between EdgeHD's native f\/10 (or f\/11) and the optional Hyperstar accessory at f\/2, making the EdgeHD the most complete imaging system in its price range\u003cbr style=\"box-sizing: inherit;\"\u003e\u003c\/span\u003e\u003c\/li\u003e\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013457866863,"sku":"94242","price":582.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/94242_reducer_lens_edgehd__79693.jpg?v=1766553527"},{"product_id":"48mm-adapter-ring-for-starfield-reducers-flattener","title":"48mm Adapter ring for Starfield Reducers \/ Flattener","description":"\u003cspan style=\"font-family: Arial; font-size: 14pt;\"\u003eReplace the 42mm T-Rings on the Starfield Reducers and Flatteners with a 48mm T-Ring Thread for fill frame cameras.\u003c\/span\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":44013465305199,"sku":"48-Adapter","price":47.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"starfield-1-0x-field-flattener","title":"Starfield 1.0x Field Flattener","description":"\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Starfield 1.0x Field Flattener enhances the imaging capabilities of refractors by elliminating fiel curvature in short, optically fast refractors providing a flat image for the camera sensor.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eWhen using a DSLR and a refractor between f\/5.5 to f\/6.5 the field is flattened across the entire sensor.  When using small chips like popular 4\/3rd's or 1\" size sensors refractors up to f\/7.5 will not experience any change in focal length\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 12pt;\"\u003eRequiring a standard 55mm of back focus, this flattener is perfect for any DSLR imager.  No additional extension rings are required.  With 38mm of clear aperture remove the chance of vignetting and is well suited for APS-C and smaller sensors. With the optional 48mm adapter a clear aperture of 42mm is provided. A 44mm Clear aperture when the optional 48mm T-Ring adapter is used.  Your imaging sessions will benefit with a flat field while maintiaining your telescopes focal length.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 12pt;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 12pt;\"\u003eA standard 10mm T-Ring is required.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 12pt;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eMulti-coated optics housed in a high polish, and hard anodize finished aluminum body to help reduce weight.  This all metal constructed accessory will look like jewelry for your telescope.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eIncludes standard M42 T thread for camera connection, and 48mm filter thread to add your favorite light pollution filter.    \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eWeights 7.5oz\u003c\/span\u003e\u003c\/p\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":44013465501807,"sku":"SF-FF-10","price":194.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Lens-01_B__93689.jpg?v=1766553726"},{"product_id":"large-field-flattener","title":"Large Field Flattener","description":"\u003cp\u003e\u003cspan style=\"font-family: Arial;\"\u003eDon't be hampered by fields that are not flat.  Up your imaging game and get the flat field you deserve!\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-family: Arial;\"\u003eImprove the overall field of view and gain better sight lines.   Become the envy of that star party next month when you show up with the biggest field flattener available.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-family: Arial;\"\u003eLimited time offer!!\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cp\u003eIt is a Big Toy that everyone needs in their Astronomy Tool Box\u003c\/p\u003e\n\u003cp\u003eIt comes in Yellow, its a Diesel.  \u003c\/p\u003e\n\u003cp\u003eIt serves a double duty as well!!  Turn it on at night to get everyone awake so that no one misses out on the clear night.  When its cloudy you can charge extra for kids to climb on it to help make your investment back.\u003c\/p\u003e\u003c\/span\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Ontario Telescope and Accessories","offers":[{"title":"Default Title","offer_id":44013473103983,"sku":"LFF","price":2000000.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/maxresdefault__41014.jpg?v=1766554338"},{"product_id":"skywatcher-reducer-corrector-85x-for-proed-evostar-80","title":"Skywatcher Reducer\/Corrector (.85x) for ProED \/ Evostar 80","description":"\u003cspan style=\"color: rgb(76, 81, 84); font-family: \" open sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003e0.85x Focal Reducer\/Corrector for Sky-Watcher PRO 80 ED APO is designed for serious Astro-Imagers. Optimized for the Sky-Watcher PRO 80 ED APO, this superb quality accessory effectively reduces the telescope’s focal length by a factor of 0.85x and provides much improved field-edge correction. Features:\u003c\/span\u003e\u003cul style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin-top: 1rem; margin-bottom: 1rem; padding-left: 20px; color: rgb(76, 81, 84); font-family: \" open sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003e55mm back focus\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eM48 threads (not standard T-thread)\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eDrops ProED 80 from f\/7.5 to f\/6.3\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44013473366127,"sku":"S20200","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sky_watcher_s20200_focal_reducer_field_flattner_for_1060554_1800x1800__98122.jpg?v=1766554349"},{"product_id":"skywatcher-reducer-corrector-85x-for-proed-evostar-120","title":"Skywatcher Reducer\/Corrector (.85x) for ProED \/ Evostar 120","description":"\u003cspan style=\"color: rgb(76, 81, 84); font-family: \" open sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003e0.85x Focal Reducer\/Corrector for Sky-Watcher PRO 120 ED APO is designed for serious Astro-Imagers. Optimized for the Sky-Watcher PRO 120 ED APO, this superb quality accessory effectively reduces the telescope’s focal length by a factor of 0.85x and provides much improved field-edge correction. Features:\u003c\/span\u003e\u003cul style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin-top: 1rem; margin-bottom: 1rem; padding-left: 20px; color: rgb(76, 81, 84); font-family: \" open sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003e55mm back focus\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eM48 threads (not standard T-thread)\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eDrops ProED 120 from f\/7.5 to f\/6.3\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44013473398895,"sku":"S20202","price":550.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/reducercorrecto_large_120_1800x1800__67513.jpg?v=1766554356"},{"product_id":"skywatcher-reducer-corrector-85x-for-proed-evostar-100","title":"Skywatcher Reducer\/Corrector (.85x) for ProED \/ Evostar 100","description":"\u003cspan style=\"font-family: \" open sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003e0.85x Focal Reducer\/Corrector for Sky-Watcher PRO 100 ED APO is designed for serious Astro-Imagers. Optimized for the Sky-Watcher PRO 100 ED APO, this superb quality accessory effectively reduces the telescope’s focal length by a factor of 0.85x and provides much improved field-edge correction. Features:\u003c\/span\u003e\u003cul style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin-top: 1rem; margin-bottom: 1rem; padding-left: 20px; font-family: \" open sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003e55mm back focus\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eM48 threads (not standard T-thread)\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eDrops ProED 100 from f\/9 to f\/7.56\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44013473431663,"sku":"S20201","price":530.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/reducercorrecto_large_100_1800x1800__11765.jpg?v=1766554362"},{"product_id":"m42-m42-extender-21mm-length","title":"M42-M42 extender (21mm length )","description":"\u003cspan style=\"font-family: Arial;\"\u003eZWO 21mm Extension ring.  M42 male and female threads.\u003c\/span\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44013503807599,"sku":"ZWO-EXT-21","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/21mmExtend-1024x853__18315.jpg?v=1766554504"},{"product_id":"explore-scientific-2-adapter-for-fffr507x-00","title":"Explore Scientific 2-inch Adapter for FFFR507X-00 Field Flattener Focal Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is the Explore Scientific 2-inch adapter, item number 510364, which connects Explore Scientific's 3-inch 0.7X Field Flattener Focal Reducer (FFFR507X-00) to a telescope fitted with a 2-inch focuser. It also works in the other direction of the same problem: it allows a 3-inch diagonal to be mounted on a 2-inch focuser drawtube.\u003c\/p\u003e\n\u003cp\u003eExplore Scientific gives its dimensions in the product description rather than in a specification table: 76mm in diameter, 36mm in height, and a weight of .15lb (.08kg). It is a purely mechanical part — there is no glass in it — and its function is to let a 3-inch accessory work on a telescope that was never built with a 3-inch focuser.\u003c\/p\u003e\n\u003cp\u003eThe value of a piece like this is that it changes what an existing telescope can carry without changing the telescope. A 0.7X reducer and flattener is a substantial upgrade to a refractor's imaging performance, and this adapter is what puts one on a tube whose focuser is 2 inches.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOwners of the FFFR507X-00 3-inch 0.7X field flattener focal reducer\u003c\/strong\u003e whose telescope has a 2-inch focuser rather than a 3-inch one.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImagers upgrading an existing refractor\u003c\/strong\u003e who would rather add a reducer and flattener than replace the focuser or the tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOwners of a 3-inch diagonal\u003c\/strong\u003e looking to use it on a telescope with a 2-inch focuser drawtube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnyone building an imaging train across two Explore Scientific size standards\u003c\/strong\u003e and needing the mechanical link between them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eObservers who have moved a flattener or diagonal between telescopes\u003c\/strong\u003e and now need the fitting for the second tube.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnects 3-inch accessories to a 2-inch focuser:\u003c\/strong\u003e the specific job it exists to do, and the reason a 3-inch flattener is not limited to 3-inch focusers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade for the FFFR507X-00 0.7X field flattener focal reducer,\u003c\/strong\u003e which is the accessory Explore Scientific names for it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso takes a 3-inch diagonal onto a 2-inch focuser drawtube,\u003c\/strong\u003e so the same part covers a visual as well as an imaging case.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e76mm diameter, 36mm height:\u003c\/strong\u003e a compact connector that adds as little as possible to the optical train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e.15lb (.08kg) published weight:\u003c\/strong\u003e negligible next to the flattener or diagonal it carries, so it does not change the balance of a setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo optical elements:\u003c\/strong\u003e nothing in the light path to add reflections, scatter or aberration — it is a mechanical coupling only.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFitting the Explore Scientific 3-inch 0.7X field flattener focal reducer to a refractor with a 2-inch focuser.\u003c\/li\u003e\n\u003cli\u003eMounting a 3-inch diagonal on a 2-inch focuser drawtube for visual observing.\u003c\/li\u003e\n\u003cli\u003eBuilding an imaging train that spans Explore Scientific's 2-inch and 3-inch fittings.\u003c\/li\u003e\n\u003cli\u003eMoving a 3-inch flattener between a 3-inch-focuser telescope and a 2-inch-focuser telescope as your setup changes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNamed accessory:\u003c\/strong\u003e Explore Scientific specifies this adapter for the FFFR507X-00 3-inch 0.7X Field Flattener Focal Reducer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocuser side:\u003c\/strong\u003e it is made for a 2-inch focuser, which covers the majority of refractors above about 80mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagonal use:\u003c\/strong\u003e Explore Scientific also lists it for mounting a 3-inch diagonal to a 2-inch focuser drawtube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight in the train:\u003c\/strong\u003e the published height is 36mm. Every component in an imaging train consumes part of the available backfocus, so 36mm is the figure to work with when you are adding up the distance from the focuser to the sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread and fitting specification:\u003c\/strong\u003e Explore Scientific does not publish the thread sizes or the clamping method for this adapter. If you are matching it to something outside the two applications they name, send us the parts involved and we will confirm the fit with our Explore Scientific representative before you order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpacing:\u003c\/strong\u003e the reducer's optimum sensor spacing is a property of the reducer rather than of this adapter, and Explore Scientific does not state how the adapter's 36mm figures into it. Send us the camera and any spacers you have and we will work the numbers through with you.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is an adapter only.\u003c\/strong\u003e The FFFR507X-00 field flattener focal reducer, the diagonal and any camera-side spacers are separate items. We stock the flattener and can quote the pair together.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt contains no optics,\u003c\/strong\u003e so it does not change magnification, field or image quality on its own. It changes what mechanically fits, which is a different and equally necessary thing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt adds 36mm of length to the optical path.\u003c\/strong\u003e On a visual setup that is rarely an issue; in an imaging train, backfocus is a budget and 36mm is part of it. If you are close to the limit of your focuser travel, that is worth checking first.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplore Scientific publishes no thread specification, material or finish detail\u003c\/strong\u003e for this part, so those rows read as not published in the table below rather than being estimated. Anything you need confirmed, we can ask them directly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIts published weight is .15lb (.08kg),\u003c\/strong\u003e which is the part itself. That figure is worth having when you are totalling up an imaging train, and it is small enough not to affect balance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. It is a mechanical connector that goes between the 2-inch focuser and the 3-inch accessory, and it takes seconds to fit. Where care is worthwhile is in the imaging train as a whole, because the 36mm of height it adds is part of the total spacing between the reducer and the camera sensor — and we are glad to work that sum out with you.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat exactly does it connect?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eExplore Scientific lists two applications: the 3-inch 0.7X Field Flattener Focal Reducer (FFFR507X-00) onto a telescope with a 2-inch focuser, and a 3-inch diagonal onto a 2-inch focuser drawtube.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it include the field flattener?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. This listing is the adapter alone. The FFFR507X-00 is a separate item, and we can put the two together on one order if that is easier.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it change the image?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNot by itself — it has no glass in it. The reducer does the optical work; this part is what lets the reducer attach.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much room does it take up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e76mm across and 36mm tall, at .15lb (.08kg). The 36mm is the number that matters when you are counting backfocus.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit my telescope?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf your telescope has a 2-inch focuser, that is the side this adapter is made for. For anything unusual, send us the make and model of the telescope and the accessory you want to attach and we will confirm it before you order.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a 76mm by 36mm, .15lb mechanical adapter that puts Explore Scientific's 3-inch 0.7X field flattener focal reducer — or a 3-inch diagonal — onto a telescope with a 2-inch focuser. If you tell us the telescope, the camera and the accessories you are joining up, we will check the spacing and the fit with you before anything ships.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44013539491951,"sku":"510364","price":138.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/0510364_1_1800x1800__63738.jpg?v=1766555641"},{"product_id":"william-optics-flat73r-reducer-flattener-with-rotator","title":"William Optics Flat73R Reducer Flattener with Rotator","description":"\u003cspan style=\"font-family: Arial;\"\u003eIncrease your filed of view on the Zenith Star 73 with the William Optics 0.8x Reducer with built in rotator.  \u003c\/span\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe adjustment ring allows for precise adjustment to get the correct spacing.  For DSLR's adjust the space ring to 1.8mm to get the required 55mm of back space when using a standard T-Ring.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: rgb(51, 51, 51); font-family: \" open sans arial neue helvetica sans-serif font-size: background-color: rgb\u003e\u003cimg src=\"https:\/\/williamoptics.com\/pub\/media\/wysiwyg\/Product\/P-FLAT73R\/Flat%2073%20R%203.jpg\" alt=\"\" style=\"margin: 0px; padding: 0px; border: 0px; height: auto; max-width: 100%; vertical-align: top;\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: rgb(51, 51, 51); font-family: \" open sans arial neue helvetica sans-serif font-size: background-color: rgb\u003e\u003cimg src=\"https:\/\/williamoptics.com\/pub\/media\/wysiwyg\/Product\/P-FLAT73R\/Flat%2073%20R%204.jpg\" alt=\"\" style=\"margin: 0px; padding: 0px; border: 0px; height: auto; max-width: 100%; vertical-align: top;\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: rgb(51, 51, 51); font-family: \" open sans arial neue helvetica sans-serif font-size: background-color: rgb\u003e\u003cimg src=\"https:\/\/williamoptics.com\/pub\/media\/wysiwyg\/Product\/P-FLAT73R\/Flat%2073%20R%205.jpg\" alt=\"\" style=\"margin: 0px; padding: 0px; border: 0px; height: auto; max-width: 100%; vertical-align: top;\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: rgb(51, 51, 51); font-family: \" open sans arial neue helvetica sans-serif font-size: background-color: rgb\u003e\u003cimg src=\"https:\/\/williamoptics.com\/media\/wysiwyg\/Product\/P-FLAT61R\/Flat%2061%20R%204%201.jpg\" alt=\"\" style=\"margin: 0px; padding: 0px; max-width: 100%; height: auto; border: 0px; vertical-align: top;\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44013579173999,"sku":"P-FLAT73R","price":369.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/img_5404__54471.png?v=1766556837"},{"product_id":"sky-watcher-quattro-coma-corrector","title":"Sky-Watcher Quattro Coma Corrector","description":"\u003cspan style=\"font-family: \" open sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eDelivers stunning wide-field views with pinpoint stars to the edge of the field. Magnification remains unaltered.\u003c\/span\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44013591330927,"sku":"S20204","price":680.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/s20204_quattrocomacorrector_1800x1800__44978.jpg?v=1766557202"},{"product_id":"adjustable-2-5-reducer-for-ed102-and-gear-115","title":"Adjustable 2.5\" Reducer for ED102 and Gear 115","description":"\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThe Starfield 0.8x adjustable reducer and flattener makes finding the correct back focus easy!  Fighting with adapters is a thing of the past! \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eBy setting the adjustment to 14.87mm with the scale, achieving 55mm of back focus is simple, and if more adjustment is needed for fine tuning all that is needed is a small twist.    If you are using accessories such as filter wheels and rotators you can not still get the required back focus.   Just add up the thickness of all the accessories, plus the distance to your sensor and subtract from 69.87 and then set the reducer to the number that is calculated.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThe reducer attaches directly to the Starfield ED102 telescope focuser by removing the Axil lock.  Using the supplied 1.5mm Allen key, loosen off the three screws a half turn and then unscrew the lock.  \u003cbr style=\"box-sizing: inherit; clear: both;\"\u003eThread the reducer onto the focuser.   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThis Reducer can also be used for other Telescopes lager than 102mm\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e102 mm \/ focal ratio f\/7 - 69.87 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e107 mm \/ focal ratio f\/6.5 - 69.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e130 mm \/ focal ratio f\/7 - 66.17 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e140 mm \/ focal ratio f\/6.5 - 65.8 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e150 mm \/ focal ratio f\/8 - 63.34 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e155 mm \/ focal ratio f\/8 - 62.57 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit; font-family: Helvetica, arial, sans-serif;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eFilters can be added inside the reducer.\u003c\/span\u003e\u003c\/p\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":44013603684463,"sku":"SF-FFRA08-2.5","price":354.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/IMG_4055__41914.jpg?v=1766557496"},{"product_id":"baader-pushfix-reducer-2-to-1-t-2-part-15a","title":"Baader Pushfix Reducer 2\" to 1¼\" (T-2 part #15a)","description":"\u003cul style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin-top: 1rem; margin-bottom: 1rem; color: rgb(76, 81, 84); font-family: \" libre franklin sans-serif font-size:=\"\" padding:=\"\" margin-left:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eIdeal for Newton Focuser e.g. Baader Newton Crayford focusers with only 1mm optical path length\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eProvides three separate mounting options for 1¼\" accessories\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eSide clamping screw and brass clamping ring for secure grip. Also includes countersunk grub screws for permanent or quick release operation of the brass clamping ring.\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eThe countersunk Delrin grub screws allow for the pressure to be set correctly. This acts as a quick release without relying on set screws. When an eye piece is inserted it is held securely and safely while still allowing the eye piece to be removed.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin-top: 1rem; margin-bottom: 1rem; color: rgb(76, 81, 84); font-family: \" libre franklin sans-serif font-size:=\"\"\u003eOur 2\"\/1¼” reducer permits you convert your 2\" focuser for use with 1¼” eyepieces and accessories. As with its little brother, the 2\" reducer incorporates several useful features. A captive spring bronze lock ring guarantees protection of your eyepiece barrels from damage. This reducer also incorporates two large nickel plated brass knurled clamp screws that are oriented 90 degrees apart. The inclusion of two clamp screws results in a superior 3-point attachment that completely constrains your equipment from wobble, particularly important for imaging applications (typical single clamp screw adapters still allow some motion). Also, for those users that are physically unable to firmly grasp and tighten lock screws, the addition of a second screw doubles the locking force (ie, particularly nice for those unable to grip tightly due to arthritis).\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003e\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eThe input side is provided with 48mm filter threads, and also includes a nested internal T-2 thread which enables you to use the reducer along with the other T-2 system components. One more unique feature sets our reducer apart - it includes an external T-2 thread that surrounds the eyepiece opening (covered and dressed by a knurled removable ring). This thread permits you to couple other T-2 accessories to the output side. In one application, you can attach T-2 Extension Tubes and create an extremely rigid afocal or eyepiece projection system. Once again, you are free to creatively construct your own combinations.\u003c\/p\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44013605388399,"sku":"T2-15A","price":76.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2408151-8-O-N-3_753x600__47054.jpg?v=1766557529"},{"product_id":"william-optics-flat6aiii-special-edition-for-fluorostar-91","title":"William Optics FLAT6AIII special edition for Fluorostar 91","description":"\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 1.8; color: rgb(64, 64, 64); font-family: \" pt sans sans-serif justify rgb font-size:=\"\" text-align:=\"\" background-color:=\"\"\u003eAdjust the distance for DSLR and mirrorless camera with the William Optics FLAT6AIII.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 1.8; color: rgb(64, 64, 64); font-family: \" pt sans sans-serif justify rgb font-size:=\"\" text-align:=\"\" background-color:=\"\"\u003eSpecifications\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 1.8; color: rgb(64, 64, 64); font-family: \" pt sans sans-serif justify rgb font-size:=\"\" text-align:=\"\" background-color:=\"\"\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFull frame size\u003c\/li\u003e\n\u003cli\u003eDesigned with nearly Full frame chip-size DSLR cameras in mind\u003c\/li\u003e\n\u003cli\u003eFMC triplet APO design\u003c\/li\u003e\n\u003cli\u003eProduced entirely with the best Ohara optical glasses\u003c\/li\u003e\n\u003cli\u003eReducing factor 0.8X\u003c\/li\u003e\n\u003cli\u003eAdjustable design, for perfect back focus it can be used with other models of refractor\u003c\/li\u003e\n\u003cli\u003e48mm filter ready\u003c\/li\u003e\n\u003cli\u003eSuperb Finish\u003c\/li\u003e\n\u003cli\u003eWilliam Optics polished anodized finish\u003c\/li\u003e\n\u003cli\u003eAll internal surfaces threaded and blackened to prevent reflections\u003c\/li\u003e\n\u003cli\u003eEasy to Use\u003c\/li\u003e\n\u003cli\u003eWill accept any standard 48mm T-ring for your camera\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 1.8; color: rgb(64, 64, 64); font-family: \" pt sans sans-serif justify rgb font-size:=\"\" text-align:=\"\" background-color:=\"\"\u003e\u003cbr style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased;\"\u003e\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44013645594735,"sku":"P-FLAT6AIII-M92","price":480.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/flat6aiii__35834.jpg?v=1766558494"},{"product_id":"sharpstar-94edph-f4-4-reducer","title":"Sharpstar 94EDPH F4.4 Reducer","description":"\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eSHARPSTAR F4.4 Full Frame Focal Reducer made especially for 94EDPH refractor telescopes, it satisfy the demands of full-frame photography. \u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe reducer uses 2.5\" lens, provides one end of a M74×1 thread, to attach the focuser of main tube. And the other end features a M48×0.75 thread, to connect camera with 55mm back focus. This reducer's interal optics consist of quadruplet air-spaced lens structure, supports full-frame photography, generates a 50mm image circle, perfect for edge decreased field illumination control. The f\/4.4 reducer works with 94EDPH refractor, reducing the  focal length to 414mm,  is the optimal choice for deep-sky astrophotography.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eIn addition, the f\/4.4 reducer features a 360-degree rotator, allows you to easily rotate the camera for astroimaging. The M48 adapter has built-in 2\" filter thread when necessary.\u003c\/span\u003e\u003c\/div\u003e","brand":"Sharpstar","offers":[{"title":"Default Title","offer_id":44013650182255,"sku":"94EDPH-0.8","price":515.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1601450368__81135.jpg?v=1766558638"},{"product_id":"sharpstar-76edph-f4-5-reducer","title":"SHARPSTAR 76EDPH F4.5 Reducer","description":"\u003cspan style=\"font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003eSHARPSTAR 76EDPH F4.5 is the latest development in dedicated full-frame reducer, which meets the need of full-frame photography. \u003c\/span\u003e\u003cdiv\u003e\u003cspan style=\"font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003eThe reducer is equipped with a 2.5\" lens specs, one end of which adopts a M74×1 thread and connects to the pinion focuser of the primary mirror. The other end adopts a M48×0.75 thread, the focal plane is 55mm from the end interface. The reducer features a triplet air-spaced structure, and full-frame photography is supported, which achieve excellent perimeter dimmer control. The reducer is specifically designed for deep-space widefield astro photography with a focal length of 342mm and a focal ratio of f\/4.5.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cbr style=\"font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003eIn addition, the 360-degree rotator allows you to easily rotate the camera to achieve the best image framing. The M48 interface contains 2 \"filter thread for easy connection\u003c\/span\u003e\n\u003c\/div\u003e","brand":"Sharpstar","offers":[{"title":"Default Title","offer_id":44013650313327,"sku":"76EDPH-0.8","price":384.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1573713457__35850.jpg?v=1766558643"},{"product_id":"sharpstar-2-5-0-8x-reducer-for-rcs","title":"Sharpstar 2.5\" 0.8x Reducer for RC's","description":"\u003cp\u003eThe RC2508 0.8x Focal Reducer\/Corrector offers full frame imaging with Ritchey Chretien telescopes between f\/6 and f\/9 focal ratios.\u003c\/p\u003e\n\u003cp\u003eFeaturing an M78x1 threaded front end for connection directly to various SharpStar focusers and an M74x1 threaded connection camera side,  the RC2508 Reducer also ships with an M48x0.75 Camera Adaptor that provides for standard camera connectivity with 55mm of back focus distance.\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sharpstar_rc2508_dimensions_1_47742e1c-05e0-4d8c-acef-14b74b4fa1b6.jpg?v=1766558672\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Ontario Telescope and Accessories","offers":[{"title":"Default Title","offer_id":44013651984495,"sku":"RC2508","price":519.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1561009682__52497.jpg?v=1766558673"},{"product_id":"baader-2-to-1-clicklock-reducer","title":"Baader 2\" to 1¼\" ClickLock Reducer","description":"\u003cul style=\"box-sizing: border-box; margin: 0px 0px 1em; padding: 0px; list-style-position: initial; list-style-image: initial; font-family: \" open sans sans-serif rgb color:=\"\" font-size:=\"\" background-color:=\"\"\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003ePrecision machined reducer to complement the Baader 2\" ClickLock-System, inserted height only 9.5mm\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eFirmly holds all 1¼\" eyepieces, accessories, and diagonals\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eClickLock compression ring made of hardened bronze ensures lifetime non-marring operation\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eFingertip operated twist-lock system works like a CNC machine chuck – onto the compression ring\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eBidirectional ratcheted lever (no thumbscrew!) indicates open\/close position in the dark\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eGentle touch onto the lever results in ultra-strong locking action – and easy release\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eAccepts all astronomical, cell-mounted 2\" eyepiece-filters\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eT-2 (M42x0.75) inner photo-thread attaches onto most T-2 threaded accessories and all Baader T-2 diagonals\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44013653295215,"sku":"T2-15B","price":112.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/baader-2-to-1-1-4-clicklock-reducer-t-2-part-15b-498__62525.jpg?v=1766558735"},{"product_id":"rcc-i-rowe-coma-corrector","title":"RCC I, Rowe Coma Corrector","description":"\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe RCC I is designed to correct Coma in fast Newtonian imaging systems. It provides a long back-focus of 91.5 mm measured from the T-2-thread, enabling the use of Off-Axis Guiders, Adaptive Optics and Filter Wheels. Autoguiding can be done easily with the RCC, an RCC Off Axis Guider and an Autoguiding Camera.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe RCC works from f\/3.5 to f\/6 - it is perfect on f\/4\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003ereproduction scale is 1:1 - in contrast to many other coma correctors, the RCC is no Barlow lens which rely on a magnification to make the larger back-focus to the sensor possible\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe RCC is the only coma corrector which gives you enough back-focus for filter wheels or other accessories without changing the focal ratio\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial; font-weight: bold;\"\u003eTo attach the RCC directly to a camera (without an Off-Axis-Guider), we recommend the VariLock 46 T-2 Extension (# 2956946, T-2 part-no. #25V). It has got not only a graduated mm-scale, but also a marking at 36.5mm, to show you the perfect working distance for a DSLR with T-2-adapter. Each air\/glass-surface of the triplet RCC optical system is coated with our Phantom Group Coating (R) for the best-possible transmission.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eYou can remove the stopper ring to place the RCC deeper inside of your focuser. \u003c\/span\u003e\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"Baader VariLock 46, Variable Length T-2 Extension tube 29-46mm, with graduated length scale","offer_id":44013657981039,"sku":"RCC-I","price":369.98,"currency_code":"CAD","in_stock":true},{"title":"No Extension","offer_id":44013658013807,"sku":"RCC-I","price":269.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/rcc-i-rowe-coma-corrector-03e__01508.jpg?v=1766558913"},{"product_id":"starfield-adjustable-2-0-8x-reducer","title":"Starfield Adjustable 2\" 0.8x Reducer","description":"\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThe Starfield 2\" 0.8x adjustable reducer and flattener makes finding the correct back focus easy!  Fighting with adapters is a thing of the past! \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThe reducer attaches directly to the Starfield telescopes focuser by removing the Axil lock. It can also be used when paired with a 2\" adapter.  Using the supplied 1.5mm Allen key, loosen off the three screws a half turn and then unscrew the lock.  \u003cbr style=\"box-sizing: inherit; clear: both;\"\u003eThread the reducer onto the focuser.   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThis Reducer can also be used for other Telescopes that are 70-102mm in aperture.\u003c\/span\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e102 mm \/ focal ratio f\/7 - 55 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e90mm \/ focal ratio f\/6  - 58 mm \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e80 mm \/ focal ratio f\/7 - 57.6 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e80 mm \/ focal ratio f\/6 - 59.6 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e70 mm \/ focal ratio f\/6 - 61.6 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit; font-weight: bold;\"\u003eHow to set your distance.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003eStarfield 80mm f\/6 with 480 focal length\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eDSLR with 55mm backfocus when using a T-Ring\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003eThe reducers distance for 80mm f\/6 is 59.6mm.   59.6mm - 55mm (DSLR and T-Ring) is 4.6mm.  Simply adjust the reducer to the 4.6mm mark an you are now ready to take pictures.   Fine tuning can be done if needed.  \u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003eFilters can be added inside the reducer.\u003c\/p\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":44013676953711,"sku":"SF-FFRA-08-2","price":319.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/IMG_5572__95904.jpg?v=1766559356"},{"product_id":"field-flattener-for-evoguide-50","title":"Field Flattener for EvoGuide 50","description":"\u003cul data-mce-fragment=\"1\" style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: transparent; margin-top: 1rem; margin-bottom: 1rem; padding-left: 20px; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\n\u003cli data-mce-fragment=\"1\" style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: transparent;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eCorrects for field curvature, allowing the Evoguide 50ED and 50DX to be used for astrophotography\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\" style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: transparent;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThread on metal caps\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\" style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: transparent;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eT-thread connection or 1.25\" opening for camera mounting\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\" style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: transparent;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e28mm imaging circle\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\" style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: transparent;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e17.5mm back focus\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\" style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: transparent;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e5.33 x 3.57-degree field of view when used with APS-C crop sensor \u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44013692092527,"sku":"S20214","price":160.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/S20214_Evo50_Flat_web_1800x1800__62760.jpg?v=1766559887"},{"product_id":"f3-9-full-frame-reducer-for-fra400-fra500","title":"F3.9 Full Frame Reducer for FRA400\/FRA500","description":"\u003cspan style=\"color: rgb(68, 68, 68); font-size: 12pt; text-align: justify; font-family: Arial;\"\u003eAskar provides a brand-new F3.9 full frame reducer for FRA400 astrograph, further reducing the focal length and thus shortening the exposure time on its original 400 focal length and f\/5.6 focal ratio design basis. The reduction factor is 0.7×, and the reduced focal length is 280mm, which can satisfy most deep-sky astrophotography. The back focus is standard 55mm. The reducer has built-in M48×0.75 thread, easy for the attachment of 2\" filters.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013705789551,"sku":"FRA400\/500 Reducer","price":397.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1588757507__61682.jpg?v=1766560228"},{"product_id":"starfield-coma-corrector","title":"Starfield Coma Corrector","description":"\u003cp class=\"MsoNoSpacing\"\u003e\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-language:en-ca=\"\"\u003eNewtonian inherit an optical distortion called as Coma, where stars at corner appears not round but bloated like a tadpole shape. The Starfield Optics coma corrector will provide a flat field image when Use on a Newtonian telescope that works from range of F\/3-F\/6. The large 2'' corrector will provide widest field of illumination for even full frame DSLR without vignetting\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNoSpacing\"\u003e\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-language:en-ca=\"\"\u003eThe Starfield Optics 2'' Coma Corrector will significantly enhance your visual experience as well, providing coma free view with sharp pin point stars. \u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" mso-fareast-language:en-ca=\"\"\u003e2\" nosepiece features recessed safety groove and is threaded to accept standard 2\" filters\u003c\/span\u003e\u003c\/p\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt; background: white;\"\u003e\n\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" color:black=\"\" mso-color-alt:windowtext=\"\" mso-fareast-language:en-ca=\"\"\u003e2\" eyepiece barrel features brass compression ring and dual large thumbscrews\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" mso-fareast-language:en-ca=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt; background: white;\"\u003e\u003cspan style=\"font-family: Arial, sans-serif;\"\u003eMagnification\u003cspan style=\"font-size: 12pt;\"\u003e factor of 1.x\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt; background: white;\"\u003e\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" color:black=\"\" mso-color-alt:windowtext=\"\" mso-fareast-language:en-ca=\"\"\u003eFully Multicoated\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt; background: white;\"\u003e\n\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" color:black=\"\" mso-color-alt:windowtext=\"\" mso-fareast-language:en-ca=\"\"\u003e3-piece modular design (i) Optics in 2\" nosepiece with 48mm male filter thread (ii) 2' eyepiece barrel that attaches to optical nosepiece, and (iii) M48 - T2 adapter ring\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" mso-fareast-language:en-ca=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt; background: white;\"\u003e\n\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" color:black=\"\" mso-color-alt:windowtext=\"\" mso-fareast-language:en-ca=\"\"\u003eBack-focus spacing requirement is approx. 70mm +\/- 5mm from the shoulder of the 2\" nosepiece to the image plane\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" mso-fareast-language:en-ca=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\" style=\"margin-bottom: 6.75pt; line-height: normal; background: white;\"\u003e\u003cspan style=\"font-size: 12pt; font-family: Arial, sans-serif; color: black; font-weight: bold;\"\u003eFor visual use:\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" color:black=\"\" mso-color-alt:windowtext=\"\" mso-fareast-language:en-ca=\"\"\u003e connect the 2\" eyepiece barrel to the main optical nosepiece \u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" mso-fareast-language:en-ca=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin-bottom: 6.75pt; line-height: normal; background: white;\"\u003e\u003cspan style=\"font-size: 12pt; font-family: Arial, sans-serif; color: black; font-weight: bold;\"\u003eFor photo use:\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" color:black=\"\" mso-color-alt:windowtext=\"\" mso-fareast-language:en-ca=\"\"\u003e unscrew the 2\" eyepiece barrel and attach the included M48-T2 ring to the main optical nosepiece Then attach your D\/SLR camera to the male T2 thread via a camera-specific T-ring (not included)\u003c\/span\u003e\u003cspan style=\"font-size: 12.0pt;\" arial=\"\" sans-serif=\"\" mso-fareast-font-family:=\"\" times=\"\" new=\"\" roman=\"\" mso-fareast-language:en-ca=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin-bottom: 6.75pt; line-height: normal; background: white;\"\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":44013736820847,"sku":"SF-CM-01","price":160.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/IMG_6600__49086.jpg?v=1766561272"},{"product_id":"x0-8-reducer-flattener-7a","title":"x0.8 Reducer Flattener 7A","description":"\u003cp style=\"box-sizing: border-box; padding: 0px; margin: 0px 0px 16px; font-family: Lato, sans-serif; line-height: 1.5; font-size: 16px; transition: none 0s ease 0s;\"\u003eThis William Optics Adjustable 0.8x Reducer\/Flattener is a great tool for those looking to increase their image quality. Made with Ohara optical glass, William Optics has designed the reducer\/flattener to be full frame ready! It has been designed to work with several different full frame camera types, whether they are CMOS or CCD. The flattener is known to work with the following:\u003c\/p\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eM4\/3\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eNikon\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eCanon\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eSony a\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003ePentax\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eFUJI\u003c\/li\u003e\u003c\/ul\u003e\u003cp style=\"box-sizing: border-box; padding: 0px; margin: 0px 0px 16px; font-family: Lato, sans-serif; line-height: 1.5; font-size: 16px; transition: none 0s ease 0s;\"\u003e\u003cspan style=\"box-sizing: border-box; font-weight: bolder;\"\u003eThreads\u003c\/span\u003e\u003cbr style=\"box-sizing: border-box;\"\u003eOn the focuser side of the reducer\/flattener there is an M92 thread for the focuser. It can also connect to M48 T-Mounts and M48 threaded filters.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; padding: 0px; margin: 0px 0px 16px; font-family: Lato, sans-serif; line-height: 1.5; font-size: 16px; transition: none 0s ease 0s;\"\u003e\u003cspan style=\"box-sizing: border-box; font-weight: bolder;\"\u003eAdjustment Distanance for DSLR or Mirrorless Camera\u003c\/span\u003e\u003c\/p\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eFLT132: 14.24 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eFLT156: 10.29 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eGT102: 15.6 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eGT153: 10.41 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eZ126: 12.76 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cp style=\"box-sizing: border-box; padding: 0px; margin: 0px 0px 16px; font-family: Lato, sans-serif; line-height: 1.5; font-size: 16px; transition: none 0s ease 0s;\"\u003e\u003cspan style=\"box-sizing: border-box; font-weight: bolder;\"\u003eBack Focus\u003c\/span\u003e\u003c\/p\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eFLT132: 69.24 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eFLT156: 65.3 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eGT102: 70.6 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eGT153: 65.4 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eZ126: 67.76 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cp style=\"box-sizing: border-box; padding: 0px; margin: 0px 0px 16px; font-family: Lato, sans-serif; line-height: 1.5; font-size: 16px; transition: none 0s ease 0s;\"\u003e\u003cspan style=\"box-sizing: border-box; font-weight: bolder;\"\u003eImage Circle\u003c\/span\u003e\u003c\/p\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eFLT132: ? 44.4 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eFLT156: ? 44.4 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eGT102: ? 44.4 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eGT153: ? 44.4 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003cli style=\"box-sizing: border-box;\"\u003eZ126: ? 43.4 mm\u003c\/li\u003e\u003c\/ul\u003e","brand":"Ontario Telescope and Accessories","offers":[{"title":"Default Title","offer_id":44013744062575,"sku":"P-FLAT7A","price":832.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/img_4902__75715.png?v=1766561516"},{"product_id":"reducer-m68e-to-m48e-to-change-m68-internal-to-m48-external","title":"Reducer M68e to M48e - to change M68 internal to M48 external","description":"Reducer M68e to M48e - to change M68 internal to M48 external","brand":"Ontario Telescope and Accessories","offers":[{"title":"Default Title","offer_id":44013754777711,"sku":"M68\/M48","price":55.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"starfield-adjustable-1-0x-flattener","title":"Starfield Adjustable 1.0x Flattener","description":"\u003cp style=\"font-size: 16px; box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThe Starfield 1.0x adjustable flattener makes finding the correct back focus easy!  Fighting with adapters is a thing of the past! \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"font-size: 16px; box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"font-size: 16px; box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eBy setting the adjustment required for your telescope, achieving the correct amount of back focus is simple.  If more adjustment is needed for fine tuning all that is needed is a small twist. If you are using accessories such as filter wheels and rotators you can not still get the required back focus.   Just add up the thickness of all the accessories, plus the distance to your sensor and subtract from 69.87 and then set the reducer to the number that is calculated.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"font-size: 16px; box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"font-size: 16px; box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThe reducer attaches directly to the Starfield telescope focusers.  Using the supplied 1.5mm Allen key, loosen off the three screws a half turn and then unscrew the lock.  \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"font-size: 16px; box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003eThread the reducer onto the focuser.   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"font-size: 16px; box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"font-size: 16px; box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThis Flattener is designed for telescopes ranging from 80mm to 155mm\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"font-size: 16px; box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e80 mm \/ focal ratio f\/6 - 81.2 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e90mm \/ focal ratio f\/6 - 82.5mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e102 mm \/ focal ratio f\/7 - 75.3 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e115 mm \/ focal ratio f\/7 - 73.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e130 mm \/ focal ratio f\/7 - 69.7 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e140 mm \/ focal ratio f\/6.5 - 68.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial;\"\u003e155 mm \/ focal ratio f\/8 - 57.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit; font-family: Helvetica, arial, sans-serif;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cp style=\"font-size: 16px; box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eFilters can be added inside the reducer.\u003c\/span\u003e\u003c\/p\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":44013792493679,"sku":"SF-FFA1","price":274.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/SF-FFA1__07764.jpg?v=1766562906"},{"product_id":"askar-107phq-130-150-phq-universal-reducer","title":"Askar 107PHQ\/130\/150 PHQ Universal reducer","description":"\u003cspan style=\"color: rgb(68, 68, 68); font-family: Arial; font-size: 14px;\"\u003eAskar’s new-launched 3” 0.7x full-frame reducer adapts for 107PHQ \u0026amp; 130PHQ.  \u003c\/span\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size:=\"\"\u003eIt has a triplet design with one ED glass. \u003c\/span\u003e\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size:\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size:\u003eThe 0.7x reduction gives 107PHQ a shortened focal ratio of 4.9 and a shortened focal length of 524mm. This reducer, connected with the astrographs, can  effectively shorten the exposure time and dramatically increase your field of view, bringing more convenience and possibilities for your deep-sky astrophotography.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013794394223,"sku":"107PHQ-Reducer","price":557.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1655171628__85803.jpg?v=1766562978"},{"product_id":"explore-scientific-field-flattener-f-5-to-f-7","title":"Explore Scientific Field Flattener f\/5 to f\/7","description":"\u003cul style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin-top: 1rem; margin-bottom: 1rem; padding-left: 20px; color: rgb(29, 29, 29); font-family: \" nunito sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eThis is a field flattener for refractor-type telescopes with a focal ratio of f\/5 to f\/7\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eCauses no change to the telescope focal length\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003e2-inch barrel to easily attach to a two-inch focuser\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eFully multi-coated optics\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eT-ring thread on the device so a T-ring can be used to easily attach a DSLR camera or a dedicated astrocamera\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003e38 mm of clear aperture\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eRequires 55mm (+\/-2) of back focus\/spacing between the device and the camera sensor\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003ePremium high glossy anodizing finish\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\u003cspan style=\"font-family: \" nunito sans sans-serif color: rgb\u003e\u003cdiv\u003eFits the following Explore Scientific telescopes:\u003c\/div\u003e\n\u003cdiv\u003eDAR1020765-01\u003c\/div\u003e\n\u003cdiv\u003eDAR127065-02\u003c\/div\u003e\n\u003cdiv\u003eDAR152065-01\u003c\/div\u003e\n\u003cdiv\u003eES-ED0806-02\u003c\/div\u003e\n\u003cdiv\u003eES-ED10207-02\u003c\/div\u003e\n\u003cdiv\u003eFCD100-0806-01\u003c\/div\u003e\n\u003cdiv\u003eFCD100-10207-02\u003c\/div\u003e\u003c\/span\u003e\u003c\/div\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44013865173103,"sku":"ES-FF2F5\/F7","price":193.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ES-FF2F5_F7__85161.jpg?v=1766564971"},{"product_id":"starizona-nexus-0-75x-newtonian-focal-reducer-coma-corrector","title":"Starizona Nexus 0.75x Newtonian Focal Reducer\/Coma Corrector","description":"\u003cspan style=\"color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003eNewtonian telescopes require a coma corrector in order to give sharp stars over a large field of view, but most coma correctors keep the telescope's native focal ratio or even make the scope slower. The Nexus instead acts as a coma corrector and also provides a 0.75x focal reduction factor. This turns a common f\/4 Newtonian into an f\/3 system, giving a larger field of view and reducing exposure times by a factor of 1.8x.\u003c\/span\u003e\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003eThe Nexus incorporates extra-low dispersion (ED) glass in a sophisticated optical design that gives performance equal to the best coma correctors while decreasing, instead of increasing, the focal length. The Nexus is also designed to be parfocal, so it does not change the original focal point of the telescope. The corrected image circle is 28mm, accommodating camera sensors up to APS format. While nominally designed for the popular commercial f\/4 imaging Newtonians, the Nexus can work with Newtonians as fast at f\/3.\u003c\/span\u003e\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003eBackfocus requirement for the Nexus is 55mm, matching the common standard for most coma correctors, field flatteners and focal reducers. This distance allows for the use of DSLRs as well as mirrorless cameras and most astronomical CMOS and CCD cameras. The Nexus has M48 threads on the camera side. The barrel of the Nexus is a standard 2\" diameter to fit most focusers. On the telescope end are M48 threads for a standard 2\" filter.\u003c\/span\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":44013888700527,"sku":"NEXUS-075","price":639.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/NexusFrontView_826x1200_9fd9e8b6-b767-428f-b1a8-6f392825698d_1200x1200__63403.jpg?v=1766565601"},{"product_id":"skywatcher-0-85x-reducer-flattener-for-evostar-72ed","title":"Skywatcher 0.85x Reducer\/Flattener for EvoStar 72ED","description":"\u003cul\u003e\n\u003cli\u003eCompatible with both APS-C and full frame sensors, APS-C (crop sensors) and smaller recommended\u003c\/li\u003e\n\u003cli\u003e55mm back focus\u003c\/li\u003e\n\u003cli\u003eDrops f\/ratio from native f\/5.8 (420mm) to f\/4.93 (355mm)\u003c\/li\u003e\n\u003cli\u003eReduces exposure time by 38% compared to native f\/5.8\u003c\/li\u003e\n\u003cli\u003e5.8 x 3.87-degree field of view when used with a full frame camera\u003c\/li\u003e\n\u003cli\u003e3.79 x 2.53-degree field of view when used with APS-C crop sensor \u003c\/li\u003e\n\u003cli\u003eIncludes thread-on adapter to mount reducer to Evostar 72ED focuser\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44013893582959,"sku":"S20212","price":580.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/S20212_Evostar72_Reducer_wIncludedAdapter2web_1800x1800__90537.jpg?v=1766565888"},{"product_id":"61edph-f-4-4-full-frame-reducer","title":"61EDPHⅢ f\/4.4 Full-Frame Reducer","description":"\u003cp\u003e\u003cspan\u003eThe special full-frame reducer of 61EDPH Ⅲ: One end of the thread is M68 × 1, connected to the focuser; the other end of the thread is M48 × 0.75 and has a built-in 2\" filter thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe special full-frame reducer of 61EDPH Ⅲ: One end of the thread is M68 × 1, connected to the focuser; the other end of the thread is M48 × 0.75 and has a built-in 2\" filter thread. The back focus is 55mm. If it needs to be extended, the adapter can be screwed down to reveal the M54 × 0.75 male thread, and the back focus becomes 75mm. The focuser adopts a quadruplet air-spaced structure, supporting full-frame imaging. With the reducer, the focal ratio of 61EDPHⅢ is reduced to F4.4 and the focal length is reduced to 270mm, making the telescope the first choice for deep sky astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460240318\/cms\/image\/7c4f1c90-3f30-48e2-87e9-9d6461bd2ee3.jpg\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Sharpstar","offers":[{"title":"Default Title","offer_id":44013897711727,"sku":"61EDPHIII-F4.5","price":317.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/61EDPH_III_rducer__64267.png?v=1766565945"},{"product_id":"61edph-iii-full-frame-flattener","title":"61EDPH III Full frame flattener","description":"\u003cp\u003e\u003cspan\u003eThe flattener: One end of the thread is M68 × 1, connected to the focuser; the other end of the thread is M48 × 0.75 and has a built-in 2\" filter thread. The back focus is 55mm. If it needs to be extended, the adapter can be screwed down to reveal the M54 × 0.75 male thread, and the back focus becomes 81.5mm. The flattener adopts a triplet air-spaced structure, the peripheral light reduction control is excellent, can effectively improve the curvature of the field, improve the corner image quality, and reduce aberrations, so that users can take clearer astronomical photos.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460240318\/cms\/image\/c4cced6a-b648-40dc-88e0-86640123b2ee.jpg\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Sharpstar","offers":[{"title":"Default Title","offer_id":44013898793071,"sku":"61EDPHIII-F","price":317.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/61EDPH_III_flatener_1__43589.png?v=1766565957"},{"product_id":"starizona-sct-corrector-iv-0-63x-reducer-coma-corrector","title":"Starizona SCT Corrector IV - 0.63X Reducer \/ Coma Corrector","description":"\u003cp\u003e\u003cstrong\u003ePerformance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/C11_f6pt3_Spot_Comparison_c86b4ee8-75ce-4333-9fb9-b0a4bb895169.jpg?v=1766566089\" alt=\"\"\u003e\u003c\/div\u003e\n\u003cp\u003eThe diagram above shows how the SCT Corrector improves the off-axis spot size on a Celestron 11\" SCT. Performance is similar on other size telescopes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFocal Length\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe exact focal length of the reducer\/telescope combo depends slightly on where in the optical path the SCT Corrector lens is placed. Nominally it will be within a few mm of the rear threads on the telescope. Changing this distance should only affect the focal length, not the optical quality. Listed below are the nominal focal lengths for the various sizes of Celestron SCTs*. The SCT Corrector works great on standard f\/10 Meade SCTs as well, we just didn't have exact data for the nominal designs of those telescopes.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"100\"\u003e\u003cstrong\u003eTelescope\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd width=\"100\"\u003e\u003cstrong\u003eFocal Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd width=\"100\"\u003e\u003cstrong\u003eFocal Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eC6\u003c\/td\u003e\n\u003ctd\u003e1220mm\u003c\/td\u003e\n\u003ctd\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eC8\u003c\/td\u003e\n\u003ctd\u003e1450mm\u003c\/td\u003e\n\u003ctd\u003ef\/7.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eC9.25\u003c\/td\u003e\n\u003ctd\u003e1525mm\u003c\/td\u003e\n\u003ctd\u003ef\/6.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eC11\u003c\/td\u003e\n\u003ctd\u003e1760mm\u003c\/td\u003e\n\u003ctd\u003ef\/6.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eC14\u003c\/td\u003e\n\u003ctd\u003e2365mm\u003c\/td\u003e\n\u003ctd\u003ef\/6.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* The SCT Corrector has a reduction factor of 0.63x, but the C6 and C8 are actually closer to f\/11 natively, and they have a shorter backfocus compared to the larger scopes so the reduction is a bit less.  The C14 is f\/11 natively.\u003cbr\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCamera Adapters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe SCT Corrector IV has a nominal image circle of 27mm, accommodating most popular CCDs and DSLRs. For larger format cameras, check out our\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/starizona.com\/products\/starizona-sct-corrector-lf-large-format-reducer-coma-corrector\"\u003eSCT Corrector LF.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eBecause the backfocus of the SCT Corrector IV is fairly critical, for best performance Starizona makes a variety of camera adapters, and custom adapters are also easy to make for less-common camera setups.\u003c\/p\u003e\n\u003cp\u003eThe nominal backfocus is 90.3mm from the base of the threads on the camera side of the SCT Corrector IV. For the largest compatible cameras, this should be kept within +\/-2mm, while smaller format cameras may work fine at slightly larger tolerances. If we do not have the correct length or style adapter you need, we can gladly make the correct part to get the best performance from your setup. Please contact with any questions on making your camera configuration work.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTelescope Adapters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe SCT Corrector IV, like the original SCT Corrector, has a 2\" barrel that allows it to fit into a 2\" visual back or 2\" focuser. If your telescope does not have such an adapter, we recommend our\u003cspan\u003e Virtual View\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003erotating visual back, which allows for easily changing the camera orientation without loosening any lock screws.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe front (telescope side) of the SCT Corrector IV is threaded to accept standard 2\" (48mm) filters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e0.63x focal reduction factor\u003c\/li\u003e\n\u003cli\u003e2.5x faster than SCT's native f\/10\u003c\/li\u003e\n\u003cli\u003e1.4x faster than original f\/7.5 SCT Corrector design\u003c\/li\u003e\n\u003cli\u003e27mm image circle\u003c\/li\u003e\n\u003cli\u003e2\" barrel diameter\u003c\/li\u003e\n\u003cli\u003e2.5\" length excluding threads\u003c\/li\u003e\n\u003cli\u003eThreaded for 48mm filters\u003c\/li\u003e\n\u003cli\u003eSCT Corrector Top Thread: M42 x 0.75mm T-thread\u003c\/li\u003e\n\u003cli\u003eMechanical Backfocus (thread shelf to focal plane): 90.3mm (3.56”)\u003c\/li\u003e\n\u003cli\u003eBlack anodized, machined aluminum housing\u003c\/li\u003e\n\u003cli\u003eFully multi-coated optics\u003c\/li\u003e\n\u003cli\u003e5-element optical design with extra-low dispersion (ED) glass\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":44013906788463,"sku":"SCTCORR-4","price":564.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sct-1_650x650__17442.jpg?v=1766566091"},{"product_id":"apex-ed-s-0-65x-reducer-flattener","title":"Apex ED 0.65x Reducer \/ Flattener - Short","description":"\u003cp\u003eWith the Apex ED reducer, an f\/5.5 apo refractor becomes an incredibly fast f\/3.6 astrograph. A slower f\/9 telescope like an RC becomes a speedy f\/5.9 system. The reduction factor provides a 1.5x wider field of view and shortens exposure times by a factor of 2.4x!\u003c\/p\u003e\n\u003cp\u003eThe Apex ED reducer features extra-low disperion glass to eliminate chromatic aberration and to provide sharp star images over a 30mm image circle, capable of working with most popular CCD, CMOS and DSLR cameras up to APS-C format.\u003c\/p\u003e\n\u003cp\u003eThe Apex ED reducer fits into a standard 2\" focuser. It has M42 T-threads on the camera side, and it can accept a standard 2\" (M48) filter on the telescope side for easy use of light-pollution or other filters. On Meade ACF telescopes, the Apex can be attached using a 2\" visual back.\u003c\/p\u003e\n\u003cp\u003eFor select refractors, we make\u003cspan\u003e optional threaded adapters\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eto allow direct threaded attachment of the Apex reducer, eliminating the possibility of tilt introduced by the standard focuser clamp ring.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\"L\" and \"S\" Versions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTo optimize the Apex ED for the best possible performance, there are two versions of the lens. The \"L\" version is designed for telescopes with focal lengths 500mm and longer. This includes most larger (100mm+) refractors and all RC and ACF telescopes. The \"S\" version is for telescopes with focal lengths from 300-500mm, including most 60-80mm apo refractors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBackfocus\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe nominal backfocus distance from the Apex ED reducer's T-threads to the image sensor depends slightly on the focal length of the telescope. It is at least 55mm in all configurations. The table below shows the optimum backfocus for various focal lengths. Please contact us for help in choosing the right adapters or spacers necessary for your setup.\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Apex-Chart_71daf9d2-16b6-4c77-9025-1666de0faac1.png?v=1766566099\" alt=\"Apex Backfocus Chart\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/threaded-adapter-set-up_072ffe11-4b39-4d08-a552-51d7b1eac34a.jpg?v=1766566100\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduction Factor\u003c\/strong\u003e: 0.65x\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage Circle\u003c\/strong\u003e: 30mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackfocus\u003c\/strong\u003e: 55-62mm (depending on telescope focal length)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Design\u003c\/strong\u003e: 5 elements with ED glass, fully multi-coated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel Diameter\u003c\/strong\u003e: 2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Thread\u003c\/strong\u003e: M42 (T-thread)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Thread\u003c\/strong\u003e: M48 (2\" filter)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (Apex ED L)\u003c\/strong\u003e: 2.97\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight (Apex ED L)\u003c\/strong\u003e: 0.7 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (Apex ED S)\u003c\/strong\u003e: 3.26\";\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight (Apex ED S)\u003c\/strong\u003e: 0.72 lbs\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":44013907476591,"sku":"APEXED-S","price":649.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/apex-1_650x650__62967.jpg?v=1766566103"}],"url":"https:\/\/ontariotelescope.com\/collections\/flatteners-and-reducers.oembed?page=4","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}