{"product_id":"svbony-sv139-nd1-2-neutral-density-moon-filter-125in","title":"SVBONY SV139 ND1.2 Neutral Density Moon Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces Lunar Glare with ND0.6 Density\u003c\/li\u003e\n\u003cli\u003eTransmits 25% of Incoming Light\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch Barrel Threads\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated Optical Glass\u003c\/li\u003e\n\u003cli\u003eNeutral Color Rendition\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\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 ND0.6 Neutral Density Filter\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV139 1.25-inch ND0.6 filter is engineered to transmit just 25% of incoming light, cutting the overwhelming glare from the Moon to reveal fine surface detail. By screwing this filter into any standard 1.25-inch eyepiece, you reduce brightness by a factor of four (a 2-stop reduction), making extended observations comfortable and bringing subtle rilles, crater walls, and ejecta blankets into sharp relief without altering the Moon's natural color.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eND0.6 Density: 25% Transmission for Comfortable Lunar Viewing\u003c\/h3\u003e\n\u003cp\u003eObserving the Moon, especially near its full phase, can be uncomfortably bright through a telescope, causing temporary dazzle and washing out delicate contrast. The SV139 filter's fixed ND0.6 density provides a 75% reduction in brightness, allowing your eye to relax and perceive the subtle tonal variations across lunar maria and highlands. This level of attenuation is ideal for most small-to-medium aperture telescopes, revealing details that are otherwise lost in the glare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptical Fidelity in a Standard 1.25-inch Cell\u003c\/h3\u003e\n\u003cp\u003eA filter is useless if it degrades the image. The SV139 uses fully multi-coated optical glass to maximize contrast and prevent internal reflections, ensuring the view remains crisp and clear. The precisely machined aluminum cell features standard 1.25-inch filter threads, guaranteeing compatibility with virtually any 1.25-inch eyepiece or accessory, allowing for quick and secure attachment for both visual observation and astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"ND0.6\" mean for the SVBONY SV139 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eND0.6\u003c\/strong\u003e signifies a Neutral Density filter that allows \u003cstrong\u003e25% of light to pass through\u003c\/strong\u003e it (a transmission factor of 10^-0.6). This is equivalent to a 2-stop reduction in exposure for photography and provides a significant, comfortable dimming effect for visual observation of bright objects like the Moon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV139 filter change the color of the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. As a \u003cstrong\u003eneutral\u003c\/strong\u003e density filter, the SV139 is designed to reduce brightness evenly across the entire visible spectrum. It dims the view without introducing any color cast, preserving the natural grey and brown tones of the lunar surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the SV139 1.25-inch filter to my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter has standard threads on its cell that screw directly into the barrel of any \u003cstrong\u003e1.25-inch eyepiece\u003c\/strong\u003e. You simply thread it onto the bottom of your chosen eyepiece before inserting the eyepiece into the telescope's focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SV139 ND0.6 filter dark enough for viewing the full Moon in a 10\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for most observers, an ND0.6 filter is an excellent choice for a 10\" telescope, providing a major reduction in glare. However, due to the large light-gathering power of the telescope, some observers may prefer an even darker filter (like an ND0.9, 13% transmission) or a variable polarizing filter for maximum comfort during the brightest phases of the Moon.\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 filter to view the crescent phase of Venus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. Venus is another extremely bright target where glare can hide its delicate crescent shape. The SV139 ND0.6 filter is very effective at reducing the planet's brightness, making its phase much easier to see clearly. It can also be useful for splitting bright double stars where one component overwhelms the other.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SV139 ND filter for deep-sky objects like nebulae or galaxies?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is not intended for faint deep-sky objects. It is designed to reduce light, which would make faint objects like the Orion Nebula (M42) or the Andromeda Galaxy (M31) completely invisible. For those targets, you need light pollution or narrowband filters that selectively pass light, rather than block it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNeutral Density (ND)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDensity\u003c\/td\u003e\n\u003ctd\u003eND0.6 (25% Transmission)\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\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSV139 1.25-inch ND0.6 Filter\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 Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861236052253,"sku":"SV-W9108C","price":12.0,"currency_code":"CAD","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-W9108C_03856145-2a09-4478-ba89-fdd05882474c.jpg?v=1788660197","url":"https:\/\/davidastro.com\/fr\/products\/svbony-sv139-nd1-2-neutral-density-moon-filter-125in","provider":"David Astro","version":"1.0","type":"link"}