{"product_id":"svbony-sv128-variable-polarizing-filter","title":"SVBONY SV128 Variable Polarizing Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" barrel sizes\u003c\/li\u003e\n\u003cli\u003eContinuously variable light transmission\u003c\/li\u003e\n\u003cli\u003eReduces glare for enhanced lunar and planetary contrast\u003c\/li\u003e\n\u003cli\u003eConstructed with optical glass lenses\u003c\/li\u003e\n\u003cli\u003eHoused in a durable aluminum frame\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 SV128 1.25\"\/2\" Variable Polarizing Filter\u003c\/h2\u003e\n      \u003cp\u003eThe SVBONY SV128 Variable Polarizing Filter, available in standard 1.25-inch and 2-inch formats, gives you direct, continuous control over image brightness. By rotating the filter housing, you smoothly adjust the light transmission to dial in the perfect view, making it an essential tool for reducing overwhelming glare from the Moon and bright planets through any 1.25\" or 2\" eyepiece.\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\u003eFine-Tune Lunar \u0026amp; Planetary Views: Glare Control for 1.25\" \u0026amp; 2\" Setups\u003c\/h3\u003e\n      \u003cp\u003eA full Moon viewed through a telescope can be uncomfortably bright, washing out subtle details like crater rays and rilles. The SV128 Variable Polarizing Filter acts like a dimmer switch for your eyepiece, allowing you to reduce the Moon's glare to a comfortable level. This enhances contrast, revealing fine surface features that are otherwise lost in the brightness.\u003c\/p\u003e\n       \u003cp\u003eThis level of control is also critical for observing bright planets like Venus and Jupiter. By toning down their intensity, you can more easily resolve cloud bands, the Great Red Spot, or the phases of Venus. The filter consists of two polarizing elements; rotating one relative to the other adjusts the degree of light reduction to match your target and viewing conditions.\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\u003eDurable Construction: Optical Glass in an Aluminum Frame\u003c\/h3\u003e\n      \u003cp\u003eThe SV128 filter is built with optical glass lenses set in a sturdy aluminum frame, ensuring image clarity and long-term durability. The standard filter threads allow for quick and easy attachment to any standard 1.25-inch or 2-inch eyepiece or accessory.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eOptical Glass Lens:\u003c\/strong\u003e Maintains the optical integrity of your telescope, providing clear views with minimal degradation.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eAluminum Frame:\u003c\/strong\u003e Provides a robust, non-flexing housing for the optics and smooth rotation for adjustment.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e Due to its thickness, this polarizing filter is not suitable for use in thin filter drawers like the SVBONY SV226.\u003c\/li\u003e\n      \u003c\/ul\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\"\u003eHow does the SV128 Variable Polarizing Filter work?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe SV128 filter uses \u003cstrong\u003etwo high-quality polarizing glass elements\u003c\/strong\u003e. As you rotate the filter housing, the alignment of these two elements changes, which controls the amount of light that can pass through. This allows for a smooth, continuous adjustment of brightness, unlike fixed neutral density filters which have a set transmission level.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the SV128 filter for observing the Moon?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary benefit for lunar observation is \u003cstrong\u003eglare reduction\u003c\/strong\u003e. A bright Moon, especially at phases greater than a quarter, can be dazzling and reduce your eye's dark adaptation. The SV128 allows you to dim the view to a comfortable level, which dramatically increases contrast and makes it easier to see fine details like crater walls, rilles, and mountain ranges along the terminator.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SV128 filter to see more detail on Jupiter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. Jupiter is another very bright target where a variable polarizer is useful. By slightly reducing its brightness with the SV128, you can better resolve the contrast between its faint cloud bands and zones. This can make features like the Great Red Spot and smaller ovals stand out more clearly, especially in larger aperture telescopes.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhich size SV128 filter do I need, 1.25\" or 2\"?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou should choose the filter size that matches the barrel size of your eyepieces. If you primarily use \u003cstrong\u003e1.25-inch eyepieces\u003c\/strong\u003e, select the 1.25\" filter. If you use larger \u003cstrong\u003e2-inch eyepieces\u003c\/strong\u003e for wide-field views, the 2\" filter is the correct choice. The filter threads directly onto the bottom of the eyepiece barrel.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SV128 filter compatible with filter wheels?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eGenerally, no. The SV128 is significantly thicker than standard color or nebula filters because of its rotating, dual-element design. It is \u003cstrong\u003etoo thick to fit in most filter wheels or thin filter drawers\u003c\/strong\u003e, such as the SVBONY SV226. It is designed to be threaded directly onto an eyepiece or other accessory.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan the SV128 filter be used for daytime terrestrial viewing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it's very effective for terrestrial use. Just like polarized sunglasses, the SV128 can reduce glare from reflective surfaces like water, sand, or snow. This increases contrast and makes for more comfortable daytime viewing through your telescope.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eVariable Polarizing Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMaterials\u003c\/td\u003e\n\u003ctd\u003eOptical glass lens, Aluminum Frame\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\"\u003eSV128 Variable Polarizing 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":52861234741533,"sku":"SV-F9147A","price":17.99,"currency_code":"USD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861234774301,"sku":"SV-F9147B","price":18.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV128-1-25-2inch-Variable-Polarizing-Filters-for-Telescope-1-F9147B_dea54dd1-64af-46d4-899b-e9583b1248ca.jpg?v=1788660055","url":"https:\/\/davidastro.com\/fr-us\/products\/svbony-sv128-variable-polarizing-filter","provider":"David Astro","version":"1.0","type":"link"}