{"product_id":"svbony-sv139-nd3-0-neutral-density-moon-filter-125in","title":"SVBONY SV139 ND3.0 Neutral Density Moon Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eND0.6 Neutral Density Filter\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch Barrel Size\u003c\/li\u003e\n\u003cli\u003eReduces Glare from the Moon and Bright Planets\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated Optical Glass\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Aluminum 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\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 Neutral Density filter provides a fixed ND0.6 light reduction, dimming the view without altering its natural color. This filter threads directly into any standard 1.25-inch eyepiece, making it an essential tool for comfortably observing the Moon and reducing the overwhelming brightness of planets like Venus and Jupiter.\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 Transmission: Taming Lunar Glare for Comfortable Viewing\u003c\/h3\u003e\n\u003cp\u003eObserving the Moon, especially near its full phase, can be uncomfortably bright through a telescope, leading to eye fatigue and a loss of subtle detail. The SV139's ND0.6 density reduces the incoming light to a comfortable level, allowing you to study lunar maria, rilles, and crater walls for extended periods without squinting or losing your dark adaptation.\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\u003eMulti-Coated Glass in a Standard 1.25\" Cell\u003c\/h3\u003e\n\u003cp\u003eConstructed with fully multi-coated optical glass set in a robust aluminum frame, the SV139 filter minimizes internal reflections and glare. The standard 1.25-inch barrel is threaded on both sides, allowing you to stack it with other filters, such as a color filter for enhancing planetary details.\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 indicates the filter's optical density. An ND0.6 filter transmits 25% of the light that hits it, effectively reducing the brightness by two f-stops. This is a moderate level of dimming, ideal for reducing the Moon's glare in most amateur telescopes without making the image too dark.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eShould I use the SVBONY SV139 ND filter or a variable polarizing filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV139 is a fixed-density filter, offering simplicity and slightly higher image fidelity due to fewer optical surfaces. A variable polarizing filter allows you to adjust the brightness, which is useful for different lunar phases or telescopes of varying aperture. For a straightforward, effective solution for lunar viewing, the SV139 ND0.6 is an excellent choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV139 ND0.6 filter be too dark for observing Jupiter's moons in my 8\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor an 8\" telescope, an ND0.6 filter will dim Jupiter's dazzling disk, often enhancing the visibility of its cloud bands. However, it will also dim its Galilean moons significantly. While they should still be visible, you may prefer to observe the moons without the filter and use it only when studying the planet itself at high magnification.\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 1.25\" filter for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this filter is very useful for lunar and planetary imaging. It helps prevent the camera's sensor from becoming saturated by the Moon's brightness, allowing for more controlled exposures. This can be particularly helpful when trying to capture faint \"earthshine\" on the dark portion of a crescent Moon.\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 the full Moon in a 120mm refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for a telescope around 120mm (5 inches) in aperture, the ND0.6 filter provides a very comfortable view of the full Moon. It strikes a good balance, cutting the intense glare while leaving enough light to see fine details clearly at various magnifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the SVBONY SV139 filter to my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV139 has standard 1.25-inch filter threads (M28.5 x 0.6mm). You simply screw it into the bottom of the barrel of any standard 1.25-inch eyepiece. You then insert the eyepiece into your telescope's focuser as usual.\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\u003eSize\u003c\/td\u003e\n\u003ctd\u003eND0.6\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\"\u003eSVBONY SV139 1.25\" 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\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\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":52861236085021,"sku":"SV-W9108D","price":9.59,"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-W9108D_f30713f0-55c3-4128-9cfc-0ce4e0594c16.jpg?v=1788660207","url":"https:\/\/davidastro.com\/en-us\/products\/svbony-sv139-nd3-0-neutral-density-moon-filter-125in","provider":"David Astro","version":"1.0","type":"link"}