{"product_id":"svbony-1-25-linear-polarizer-filter","title":"SVBONY 1.25″ Linear Polarizer Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/F9165A-0_20251231144915_3904.webp?v=1791670066\" alt=\"SVBONY F9165A 1.25″ linear polarizer filter for lunar and planetary observing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY F9165A is a 1.25″ linear polarizer filter in an aluminium M28.5 x 0.6 cell, 2.4 mm thick. It dims the view of bright objects to increase contrast at the eyepiece, and SVBONY uses neutral-coloured optical glass so the Moon keeps its natural colour. Each filter is individually precision ground and polished.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe or photograph the Moon and bright planets through a 1.25″ eyepiece or imaging train and want lower glare without the colour tint of a blue moon filter.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9165a--7-_20250806193227_5333.jpg?v=1791670066\" alt=\"SVBONY F9165A 1.25″ linear polarizer filter for lunar and planetary observing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlare reduction:\u003c\/strong\u003e dims the Moon for more comfortable, longer observing sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeutral colour:\u003c\/strong\u003e neutral-coloured optical glass keeps the Moon's natural colour.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision optics:\u003c\/strong\u003e individually ground and highly polished optical glass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminium cell:\u003c\/strong\u003e standard M28.5 x 0.6 thread, 2.4 mm thick.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar observing:\u003c\/strong\u003e more contrast on craters and terminator detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBright planets:\u003c\/strong\u003e lower glare on Venus and Jupiter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary photography:\u003c\/strong\u003e SVBONY notes it enhances lunar and planetary contrast in photographic images.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/4_20250806193229_6023.jpg?v=1791670066\" alt=\"SVBONY linear polarizer filter for lunar and planetary observing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M28.5 x 0.6, for 1.25″ eyepieces, diagonals and nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ version:\u003c\/strong\u003e SVBONY also makes it in 2″ (F9165B, M48 x 0.75).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable dimming:\u003c\/strong\u003e a single linear polarizer gives a fixed reduction. Pairing two polarizers and rotating one against the other is the usual way to get adjustable dimming.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9165b2_20250806193227_1291.jpg?v=1791670066\" alt=\"SVBONY linear polarizer filter family image for lunar and planetary observing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomated cameras:\u003c\/strong\u003e SVBONY notes these filters are generally not suited to highly automated digital cameras, whose metering and autofocus can be affected by polarized light.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot a solar filter:\u003c\/strong\u003e it is for the Moon and planets only.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for this filter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It threads by hand into the filter thread of a 1.25″ eyepiece or diagonal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is it different from a moon filter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA blue moon filter adds a colour tint. The polarizer uses neutral glass, so the Moon's colour is unchanged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for imaging?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, for lunar and planetary imaging with astronomy cameras. Highly automated consumer cameras may not meter correctly through it.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ M28.5 linear polarizer with neutral optical glass in an aluminium cell, for glare-free, natural-colour views of the Moon and bright planets.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"1.25″","offer_id":67722216734831,"sku":"F9165A","price":22.79,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/F9165A-0_20251231144915_3904.webp?v=1791670066","url":"https:\/\/ontariotelescope.com\/products\/svbony-1-25-linear-polarizer-filter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}