{"product_id":"svbony-sv139-1-25-nd-moon-filter","title":"SVBONY SV139 1.25″ ND Neutral Density Moon Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386121617552700578996694.jpg?v=1791669936\" alt=\"SVBONY SV139 1.25″ ND moon filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV139 is a 1.25″ neutral density filter for lunar observing. A neutral density filter dims the whole image evenly across the spectrum, so the Moon becomes comfortable to look at without taking on a green or yellow cast. This listing is the ND0.6 density (item W9108A), which passes 25% of the incoming light and is the density SVBONY pairs with a waxing crescent Moon. The filter is optical glass in a 2 mm aluminium cell with a standard M28.5 x 0.6 thread.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386121618573407683557384.jpg?v=1791669936\" alt=\"SVBONY SV139 neutral density filter overview panel\" style=\"max-width:100%;height:auto;\"\u003e\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 the Moon visually and find the view glaring, particularly through a larger-aperture telescope, and want to cut the brightness while keeping the Moon's natural grey tones.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeutral density:\u003c\/strong\u003e reduces brightness evenly without shifting colour balance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eND0.6, 25% transmission:\u003c\/strong\u003e a moderate reduction suited to the thinner lunar phases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 1.25″ thread:\u003c\/strong\u003e M28.5 x 0.6, so it threads into the barrel of any 1.25″ eyepiece or diagonal nosepiece with filter threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlim 2 mm cell:\u003c\/strong\u003e aluminium frame with a metal thread and an optical glass element.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386121619688347081092840.jpg?v=1791669936\" alt=\"SVBONY SV139 ND filter feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386121621036001007528051.jpg?v=1791669936\" alt=\"SVBONY SV139 ND filter construction detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual lunar observing\u003c\/strong\u003e around crescent phases, where SVBONY matches ND0.6.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBright-target viewing\u003c\/strong\u003e where reduced glare makes surface detail easier to follow.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSVBONY makes the SV139 in four densities and matches each to a Moon phase: ND0.6 (25%) for a waxing crescent, ND0.9 (12.5%) for first and last quarter, ND1.2 (6.25%) for waxing and waning gibbous, and ND3.0 (0.1%) for the full Moon.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386121622063114053507452.jpg?v=1791669936\" alt=\"SVBONY SV139 ND filter densities matched to Moon phases\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386121623149992628888176.jpg?v=1791669936\" alt=\"SVBONY SV139 ND filter transmission panel\" 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\u003eFits:\u003c\/strong\u003e any 1.25″ eyepiece or accessory with standard M28.5 x 0.6 filter threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStacking:\u003c\/strong\u003e the cell is threaded, so it can be combined with other 1.25″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386121624091991109313103.jpg?v=1791669936\" alt=\"SVBONY SV139 ND filter threaded into a 1.25″ eyepiece\" 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\u003eDensity:\u003c\/strong\u003e this listing is ND0.6. The ND0.9, ND1.2 and ND3.0 versions are separate densities; if you would like one of those, get in touch and we will order it for you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot a solar filter:\u003c\/strong\u003e the SV139 is made for the Moon and is not designed for viewing the Sun.\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 into the bottom of a 1.25″ eyepiece barrel before the eyepiece goes into the diagonal or focuser.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it change the colour of the Moon?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. A neutral density filter reduces brightness evenly, so the Moon keeps its natural tones.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich density should I choose?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY's guide is ND0.6 for a crescent, ND0.9 for quarter phases, ND1.2 for gibbous phases and ND3.0 for the full Moon. Larger apertures gather more light, so a denser filter can help at the same phase.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ ND0.6 moon filter that passes 25% of the light, threads into a standard eyepiece, and takes the glare off the Moon without altering its colour.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"ND0.6","offer_id":67722188030063,"sku":"W9108A","price":13.55,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/W9108A-0_20251231145316_7077.webp?v=1791669936","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv139-1-25-nd-moon-filter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}