{"product_id":"explore-scientific-sidara-plus-127-refractor-alt-azimuth-telescope","title":"Explore Scientific Sidara Plus 127mm Refractor Telescope and Alt-Azimuth Mount with Sky Assist","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe Sidara Plus 127 is the largest refractor package in Explore Scientific's Sidara line: a 127 mm objective with an 820 mm focal length, riding on the Sidara Plus alt-azimuth mount with slow-motion controls on both axes, a tripod, and the eyepieces and accessories supplied with the package. Explore Scientific's own description calls it a system that \"gathers a substantial amount of light while maintaining a balanced field of view,\" and lists it under item number ES-AR127820-MAZ01. Working out to roughly f\/6.5, it is the aperture-first choice in the series for someone who wants a refractor rather than a reflector and does not want the tube to be the limiting factor.\u003c\/p\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis is a first telescope for someone who has decided they want a refractor and wants the biggest one in the range, or a gift for someone in that position. Be clear on what a 127 mm aperture actually buys. Against the 90 mm Sidara Nano it collects roughly twice the light, and against a 60 mm department-store scope it collects more than four times as much. In practice that means the Moon at high power is genuinely absorbing, with craters, rilles and shadow detail along the terminator that changes night to night. Saturn's rings will be an unmistakable ring rather than an ambiguous bulge. Jupiter shows its two main cloud belts and the four Galilean moons. Brighter deep sky objects such as the Orion Nebula, the Andromeda Galaxy, the Pleiades and the great cluster in Hercules are within reach from a suburban garden, but they will look like grey, textured mist rather than the colour images you have seen online. No telescope at any price shows those colours to the eye. That is a limit of human night vision, not of this instrument.\u003c\/p\u003e\n\u003cp\u003eRefractor against reflector matters at this size. The refractor here has a sealed tube with no central obstruction, so contrast on the Moon and planets is clean, collimation is not something you will ever have to think about, and there is nothing to align before you observe. The trade-off is that a 127 mm achromatic refractor at this focal ratio shows some violet-blue fringing around very bright objects, most visibly on the limb of the Moon, on Venus and on Jupiter, which the 150 mm Sidara Plus reflector does not. The reflector in turn gives you more aperture for less money but needs occasional collimation and takes longer to cool to outside temperature. If you value low fuss and colour-neutral contrast on the Moon and planets, and you can live with a little fringing on the very brightest targets, the refractor is the more forgiving instrument to own.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features \u0026amp; Design\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e127 mm aperture refractor with an 820 mm focal length, roughly f\/6.5, and the largest refractor in the Sidara series.\u003c\/li\u003e\n\u003cli\u003eSidara Plus alt-azimuth head with slow-motion controls on both axes for smooth geared tracking rather than nudge-and-hope.\u003c\/li\u003e\n\u003cli\u003eSky Assist target guidance, which Explore Scientific describes as \"helping guide users to celestial targets, reducing time spent searching and increasing time spent observing.\"\u003c\/li\u003e\n\u003cli\u003eSupplied as a complete package: optical tube, mount, tripod, and eyepieces and accessories per the package configuration.\u003c\/li\u003e\n\u003cli\u003eStraightforward up-and-down, left-and-right alt-azimuth motion that matches how a beginner intuitively expects a telescope to move.\u003c\/li\u003e\n\u003cli\u003eUnobstructed refractor light path with no secondary mirror, no diffraction spikes and no collimation routine.\u003c\/li\u003e\n\u003cli\u003eBuilt by Explore Scientific to stay portable enough that it gets carried outside regularly rather than left in a cupboard.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eOptical and Mechanical Design\u003c\/h2\u003e\n\u003cp\u003eTwo numbers do most of the work here. The 127 mm aperture sets both how much light the telescope collects and how fine a detail it can resolve, and resolving power scales with aperture, so a 127 mm objective separates closer double stars and shows finer lunar features than any smaller tube regardless of which eyepiece you screw into it. The 820 mm focal length then sets the magnification each eyepiece delivers, since magnification is telescope focal length divided by eyepiece focal length: a 25 mm eyepiece gives about 33x for wide, easy sweeping and a 10 mm gives about 82x for the Moon and planets. The useful ceiling for a 127 mm aperture sits somewhere near 250x on a steady night, and atmospheric seeing will usually stop you well below that. Mechanically, an alt-azimuth mount moves in altitude and azimuth rather than following the sky's rotation about a single axis, which makes it far more intuitive to point but means you correct in two directions as an object drifts out of the field. That is precisely what the dual-axis slow-motion controls are for. They let you make small geared corrections at high magnification without knocking the tube off target, which is the difference between usable and infuriating above about 80x.\u003c\/p\u003e\n\n\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDetailed lunar observing, where the aperture and the unobstructed light path show terminator detail that changes from night to night.\u003c\/li\u003e\n\u003cli\u003ePlanetary viewing: Saturn's rings, Jupiter's belts and moons, the phases of Venus, and Mars around opposition.\u003c\/li\u003e\n\u003cli\u003eBrighter deep sky objects from suburban skies, including open and globular clusters, the Orion Nebula and the brighter galaxies.\u003c\/li\u003e\n\u003cli\u003eSplitting double stars, where the 127 mm aperture's resolving power is the deciding factor.\u003c\/li\u003e\n\u003cli\u003eA first serious telescope for an adult beginner or an older child who wants an instrument they will not outgrow in a season.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\n\u003cp\u003eThe package arrives with eyepieces and accessories per Explore Scientific's package configuration, and that supplied set is a starting point rather than a finished collection. The most worthwhile early additions are a good medium-power eyepiece somewhere in the 8 mm to 12 mm range for planetary work, a neutral density Moon filter to take the glare off a near-full Moon at this aperture, and a comfortable star diagonal if you find yourself craning at objects high overhead. Explore Scientific does not publish the focuser barrel size, the eyepiece specifications, the finder type or the diagonal for this package on its product page, so if you are buying eyepieces or a diagonal to go alongside it, contact our team in Bolton and we will confirm the fitting before you order rather than have you guess. The same applies to whether this tube's dovetail will transfer onto an equatorial mount later, which is genuinely model-dependent and worth checking rather than assuming.\u003c\/p\u003e\n\n\u003ch2\u003eGood to Know Before You Order\u003c\/h2\u003e\n\u003cp\u003eExplore Scientific publishes no shipping weight for this item, so we are confirming it on our own scales before the listing goes live. That is why it is currently unpublished. Contact us and we will give you a shipping figure for your address. Beyond the weight, Explore Scientific's published information on this package is unusually thin. The product page gives the aperture, the focal length, the mount type and the fact that eyepieces and accessories are included, but it does not itemise which eyepieces, which finder or which diagonal ship in the box, and there is no specification table. We are not going to invent those details, so ask us and we will confirm against the carton before you commit. Note too that this is an alt-azimuth mount rather than an equatorial one, and it is not a motorised GoTo mount: pointing and tracking are done by hand using the slow-motion controls. It is not an astrophotography rig, and it will manage casual phone snaps of the Moon and not much more.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat exactly is Sky Assist, and do I need a phone for it?\u003c\/strong\u003e On this package Explore Scientific describes Sky Assist only as target guidance, in their words \"helping guide users to celestial targets, reducing time spent searching and increasing time spent observing.\" On their motorised Sidara Pro mounts they go further and say that using Sky Assist \"users can select targets and allow the mount to move the telescope into position,\" but the Sidara Plus is a manual mount, so here it is a finding aid rather than something that drives the telescope for you. Explore Scientific has not published the full detail of what the feature requires or how it is set up, and we would rather say that plainly than guess. Contact us and we will confirm the current details with the distributor.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill I see colour in nebulae and galaxies the way photographs show it?\u003c\/strong\u003e No, and no telescope will. The colour receptors in the human eye do not work at low light levels, so deep sky objects appear as grey or grey-green structure regardless of aperture. What more aperture buys you is more of that structure, seen more clearly. The Moon, the planets and stars do show colour.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I buy this or the 150 mm Sidara Plus reflector?\u003c\/strong\u003e Take the 127 mm refractor if you want clean contrast, no maintenance and no collimation, and you mainly observe the Moon and planets. Take the 150 mm reflector if raw light grasp on faint deep sky objects matters more to you and you do not mind checking collimation from time to time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan a complete beginner set this up alone?\u003c\/strong\u003e Yes. It is a package designed to go together without tools beyond what is supplied, and the alt-azimuth mount removes the polar alignment step that trips people up on equatorial mounts. Allow one unhurried evening indoors to assemble it and to learn the focuser and finder before you take it out in the dark.\u003c\/p\u003e\n\n\u003ch2\u003eBottom Line\u003c\/h2\u003e\n\u003cp\u003eThe Sidara Plus 127 is the aperture-first refractor in the Sidara range, and it earns that aperture on the Moon, the planets and the brighter deep sky. It asks nothing of you in maintenance and gives you geared slow-motion control where a beginner package usually gives you a stiff pan handle. If you are weighing it against the 150 mm reflector or one of the smaller Sidara packages, contact our team in Bolton and we will talk it through against your skies and your budget.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":53958605602927,"sku":"ES-AR127820-MAZ01","price":1246.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sidaraplus127v2.jpg?v=1785960657","url":"https:\/\/ontariotelescope.com\/products\/explore-scientific-sidara-plus-127-refractor-alt-azimuth-telescope","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}