{"product_id":"svbony-sv139-nd0-9-neutral-density-moon-filter-125in","title":"SVBONY SV139 ND0.9 Neutral Density Moon Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces lunar brightness by ~87.5% (ND0.9)\u003c\/li\u003e\n\u003cli\u003eFits any standard 1.25-inch eyepiece or accessory\u003c\/li\u003e\n\u003cli\u003eNeutral density filter preserves true color balance\u003c\/li\u003e\n\u003cli\u003eFully multi-coated optics prevent glare and reflections\u003c\/li\u003e\n\u003cli\u003eDurable black-anodized aluminum filter cell\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eSVBONY SV139 1.25-inch ND0.9 Neutral Density Filter\u003c\/h2\u003e\n      \u003cp\u003eThe SVBONY SV139 Telescope Filter provides a specific ND0.9 density, designed to fit any standard 1.25-inch eyepiece. This level of filtration reduces the overwhelming brightness of the Moon by approximately 87.5% (transmitting 12.5% of light), allowing your eye to perceive subtle rilles, crater walls, and ejecta blankets that are normally lost to glare.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eND0.9 Brightness Reduction: Comfortable Lunar Viewing\u003c\/h3\u003e\n      \u003cp\u003eObserving the Moon, especially from the first quarter to full, can be uncomfortably bright through a telescope, causing your pupil to contract and washing out fine detail. The SV139 filter's ND0.9 rating darkens the view to a comfortable level without altering its natural color. This significant 87.5% reduction in brightness (an 8× reduction) is ideal for revealing low-contrast features across lunar maria and highlands.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eMulti-Coated Optics in a 1.25\" Cell: Preserving Contrast\u003c\/h3\u003e\n      \u003cp\u003eWhile designed to reduce light, this filter uses fully multi-coated optical glass to ensure that the light you do see is pristine. These coatings prevent internal reflections between the eyepiece and the filter, which could otherwise reduce contrast and introduce ghosting. The filter is housed in a durable, threaded 1.25-inch aluminum cell for a secure fit on any standard eyepiece or filter wheel.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does ND0.9 mean for the SVBONY SV139 filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eND0.9\u003c\/strong\u003e is a measure of optical density. It means the filter allows approximately 12.5% of the light to pass through it, effectively blocking 87.5% of the incoming light (a 3-stop or 8× reduction). This is a strong level of filtration, ideal for reducing glare from a bright or full Moon for visual observation.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV139 ND filter for observing planets like Jupiter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, in larger aperture telescopes (typically 8\" or more), planets like Jupiter and Venus can be bright enough to cause glare that obscures fine detail. The SVBONY SV139 ND0.9 filter helps cut this glare effectively, improving contrast on Jupiter's cloud bands or subtle features on Venus without affecting the planet's natural color.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SV139 ND filter affect the color of the Moon?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt doesn't. The \"ND\" in the SVBONY SV139 stands for \u003cstrong\u003eNeutral Density\u003c\/strong\u003e, which means it reduces the intensity of all wavelengths of light equally. This darkens the image without introducing any color cast, so the Moon retains its natural grey and subtle brown tones.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV139 1.25\" ND filter work with my 8\" Dobsonian telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. The SVBONY SV139 filter has standard 1.25-inch filter threads (M28.5x0.6), which will screw directly into the barrel of any standard 1.25-inch eyepiece you would use with your 8\" Dobsonian. The ND0.9 density is an excellent choice for an 8\" scope, as it provides strong glare reduction for lunar viewing.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use the SVBONY SV139 ND0.9 filter instead of a weaker or stronger one?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe ND0.9 provides an 87.5% light reduction (12.5% transmission), making it ideal for medium-to-large telescopes viewing the Moon near its full phase. An ND0.6 (25% transmission) is better for smaller scopes or early moon phases, while an ND1.2 or ND3.0 provides extreme light reduction for very large apertures.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack the SVBONY SV139 filter with other 1.25\" filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The SVBONY SV139 filter cell is threaded on both sides. You can stack it with a color filter (like a #80A Blue to enhance contrast on Jupiter) or even another ND filter to create a stronger dimming effect. However, stacking filters can sometimes introduce reflections, so it's best to use the minimum number of filters necessary.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV139\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNeutral Density (ND)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Density\u003c\/td\u003e\n\u003ctd\u003eND0.9\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLight Transmission\u003c\/td\u003e\n\u003ctd\u003e~12.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eSVBONY SV139 1.25-inch ND0.9 Filter\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003ePlastic Storage Case\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861236019485,"sku":"SV-W9108B","price":9.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV139-Telescope-Filter-1-25inch-ND-Neutral-Density-For-Moon-Viewing-1-W9108B_29210557-1fc0-4351-b54b-60152cf50f46.jpg?v=1788660188","url":"https:\/\/davidastro.com\/fr-int\/products\/svbony-sv139-nd0-9-neutral-density-moon-filter-125in","provider":"David Astro","version":"1.0","type":"link"}