{"title":"Visual Filters","description":"\u003cdiv\u003e\n  \u003cp\u003e\n    Visual filters are designed for the eye rather than a sensor, and the difference matters. Human night vision is most sensitive around 500 nm, so a visual nebula filter is tuned to pass what your dark-adapted eye can actually detect, while an imaging filter is tuned to what silicon records. David Astro carries visual filters in Canada, held in Canadian stock.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    Aperture determines how much filtering you can afford to lose light to. Tell us your telescope and targets and we will recommend accordingly.\n  \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- more --\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eFilters Designed for the Eye\u003c\/h2\u003e\n  \u003cp\u003e\n    A visual filter must balance contrast gain against absolute brightness, because the eye needs a certain amount of light before it detects anything at all.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eScotopic sensitivity:\u003c\/strong\u003e Dark-adapted vision peaks near 500 nm, close to the OIII emission line, which is why OIII filters have such a dramatic visual effect on planetary nebulae.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUHC-type filters:\u003c\/strong\u003e Pass the main nebula emission lines together, giving broad contrast gain with less light loss than a single-line filter.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAperture and brightness trade:\u003c\/strong\u003e The narrower the filter, the more aperture you need behind it. An OIII filter in a small telescope leaves very little to see.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBroadband filters:\u003c\/strong\u003e Milder light pollution rejection that keeps star fields looking natural, appropriate for clusters and galaxies where narrow filters do not help.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBarrel sizes:\u003c\/strong\u003e 1.25 inch and 2 inch, matched to your eyepiece set and diagonal.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDifference from imaging filters:\u003c\/strong\u003e Imaging narrowband filters are far narrower and would leave a visual observer with almost nothing to see.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eWhy Choose David Astro for Visual Filters\u003c\/h2\u003e\n  \u003cp\u003e\n    A filter that suits a sensor may show you nothing at the eyepiece, and vice versa.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVisual and imaging distinguished clearly:\u003c\/strong\u003e We will not sell you a 3 nm imaging filter for visual observing, because at the eyepiece it removes almost all the light.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAperture matched:\u003c\/strong\u003e We recommend filter strength against your telescope's aperture, since narrow filters need light behind them.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTarget honesty:\u003c\/strong\u003e Galaxies and clusters gain nothing from nebula filters, and we will say so rather than sell one anyway.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAuthorized dealer:\u003c\/strong\u003e Genuine filters with verified coatings and manufacturer warranty, in Canadian stock.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eShips from Canada:\u003c\/strong\u003e No duties or brokerage fees for Canadian buyers.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eVisual Filters in Canada — Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003e\u003cstrong\u003eCan I use imaging filters visually?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eTechnically yes, practically no. Imaging narrowband filters are far too narrow for the eye and leave almost nothing visible. Visual filters are deliberately wider for this reason.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eWhich filter first?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eA UHC-type filter. It improves the widest range of emission targets and dims the view less than an OIII, which matters below about 10 inches of aperture.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eWhy do OIII filters work so well visually?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eBecause the OIII line at 500.7 nm sits very close to the peak sensitivity of dark-adapted human vision, so the light it passes is the light your eye detects best.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eWill a filter help me see galaxies?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eNo. Galaxy light is broadband, so a filter removes it along with the skyglow. Dark skies and aperture are the only things that help with galaxies.\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eImproving contrast at the eyepiece?\u003c\/h2\u003e\n  \u003cp\u003eTell us your aperture and targets and we will recommend a filter. Held in Canada, shipped fast.\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"celestron-moon-filter-set-1-25","title":"Celestron Moon Filter Set - 1.25”","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFour essential 1.25” lunar filters in one kit\u003c\/li\u003e\n\u003cli\u003eThree Neutral Density (ND) filters reduce brightness with 13%, 25%, and 50% transmission\u003c\/li\u003e\n\u003cli\u003eMoon \u0026amp; Sky Glow filter enhances contrast on subtle lunar features\u003c\/li\u003e\n\u003cli\u003eStackable anodized aluminum cells weighing only 6 g each\u003c\/li\u003e\n\u003cli\u003eIncludes a foam-lined hard case, a printed moon map, and a downloadable eBook\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\u003eDownloads\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\u003eCelestron Moon Filter Set - 1.25”\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Moon Filter Set - 1.25” provides the definitive toolkit for observing our nearest celestial neighbor. This four-filter kit manages the Moon's overwhelming glare, allowing you to select the perfect light reduction from 13%, 25%, or 50% transmission to match any lunar phase, eyepiece, or telescope aperture. Each 1.25\" filter is housed in a durable aluminum cell weighing just 6 grams, and the included Moon \u0026amp; Sky Glow filter selectively blocks wavelengths to dramatically increase contrast on subtle rilles and maria. The entire system, including the protective hard case, weighs only 74 grams.\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\u003eThree Neutral Density Filters: 13%, 25%, and 50% Transmission for Every Lunar Phase\u003c\/h3\u003e\n\u003cp\u003eThis set gives you three distinct levels of neutral density filtration to perfectly match viewing conditions. The ND96-0.9 filter passes just 13% of light, ideal for taming a full moon in a large-aperture telescope. For quarter phases or smaller scopes, the ND96-0.6 (25% transmission) and ND96-0.3 (50% transmission) filters reduce glare without over-darkening the view, making faint crater details easier to hold and reducing eye fatigue during long sessions.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eND96-0.9 (13% T):\u003c\/strong\u003e The workhorse for the brightest conditions, such as a full moon viewed through an 8\" or larger telescope at low power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eND96-0.6 (25% T):\u003c\/strong\u003e An excellent mid-range choice for gibbous phases or for use with medium-power eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eND96-0.3 (50% T):\u003c\/strong\u003e Perfect for observing the slender crescent moon or for use with high-magnification eyepieces on smaller refractors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMoon \u0026amp; Sky Glow Filter: Enhanced Contrast on Lunar Maria and Rilles\u003c\/h3\u003e\n\u003cp\u003eWhile ND filters reduce brightness uniformly, the light purple Moon \u0026amp; Sky Glow filter works differently. It selectively reduces transmission of specific wavelengths, which significantly boosts the contrast between different lunar terrains. This filter makes the boundaries of dark maria, the subtle shading in crater floors, and delicate rilles pop with newfound clarity.\u003c\/p\u003e\n\u003cp\u003eAs a secondary benefit, this filter also blocks certain wavelengths associated with common forms of urban light pollution, like low-pressure sodium streetlights. This can provide a modest contrast increase on deep-sky objects from suburban skies, adding to its utility beyond lunar observation.\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\u003eProfessional Build: 1.25\" Aluminum Cells and Stackable Threads\u003c\/h3\u003e\n\u003cp\u003eEach filter in the Celestron Moon Filter Set is built for durability and optical integrity. The filter glass is mounted in a rigid, black-anodized aluminum cell that threads directly into any standard 1.25\" eyepiece or accessory. At just 6 grams per filter, they add virtually no weight to your optical train, preserving your telescope's balance.\u003c\/p\u003e\n\u003cp\u003eFor ultimate control, each filter features male and female threads, allowing you to stack them. Combining the 13% and 25% ND filters, for example, creates an even denser filter for specialized applications like attempting to view the crescent phase of Venus in daylight.\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\u003eBeyond the Filters: Included Moon Map and Lunar Landscapes eBook\u003c\/h3\u003e\n\u003cp\u003eTo deepen your lunar explorations, this kit includes essential learning tools. A durable, handheld Moon map comes complete with a legend highlighting 17 key features to identify, from the Sea of Tranquility to the magnificent crater Copernicus. This allows you to turn a casual glance into a guided tour.\u003c\/p\u003e\n\u003cp\u003eYou also receive a free download of Robert Reeves’ eBook, \u003cem\u003eLunar Landscapes\u003c\/em\u003e. This guide provides fascinating context on the natural history of the Moon, the formation of its craters and maria, and the stories behind its most famous landmarks, helping you understand the science behind what you see in the eyepiece.\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\"\u003eWhich filter in the Celestron Moon Set should I use for a full Moon in my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a full Moon with a large-aperture telescope like an 8\" SCT, start with the darkest filter, the \u003cstrong\u003eND96-0.9 (13% transmission)\u003c\/strong\u003e. This will cut the intense glare most effectively, especially at lower magnifications, making the view comfortable and revealing subtle ray details.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between the ND filters and the Moon \u0026amp; Sky Glow filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe three \u003cstrong\u003eNeutral Density (ND) filters\u003c\/strong\u003e are like sunglasses; they dim all colors of light equally to reduce overall brightness. The \u003cstrong\u003eMoon \u0026amp; Sky Glow filter\u003c\/strong\u003e is a contrast-enhancing filter; it selectively blocks certain wavelengths of light to make subtle features on the lunar surface stand out more clearly. It imparts a faint purple tint to the image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack the filters in the Celestron 1.25\" Moon Set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. All four filters feature standard 1.25\" filter threads on both sides of their aluminum cells, so they can be stacked. For instance, you could thread the Moon \u0026amp; Sky Glow filter into your eyepiece and then thread one of the ND filters onto it to both increase contrast and reduce brightness simultaneously.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill these filters work with eyepieces from other brands?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the filters use standard 1.25\" (M28.5x0.6) threads. They will fit the vast majority of 1.25\" eyepieces and filter-ready accessories from Celestron and other manufacturers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I decide between the 13%, 25%, and 50% transmission filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe choice depends on three factors: the Moon's phase, your telescope's aperture, and the magnification you're using.\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrightest views (Full Moon, large scope, low power):\u003c\/strong\u003e Use the 13% filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModerate views (Gibbous Moon, mid-size scope):\u003c\/strong\u003e Use the 25% filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimmest views (Crescent Moon, small scope, high power):\u003c\/strong\u003e Use the 50% filter or no filter at all.\u003c\/li\u003e\n\u003c\/ul\u003e\nThe set gives you the flexibility to experiment and find the most pleasing view for your specific setup.\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Celestron Moon Filter Set be used for anything besides the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The ND filters are excellent for reducing the glare of Venus, which helps in discerning its crescent phase. They can also be used for terrestrial daylight viewing through a telescope. The Moon \u0026amp; Sky Glow filter can offer a minor contrast boost on some deep-sky objects from light-polluted locations.\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\u003eFilter Size\u003c\/td\u003e\n\u003ctd\u003e31.75mm (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Housing\u003c\/td\u003e\n\u003ctd\u003eAnodized Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eStandard 1.25\" (Stackable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter 1\u003c\/td\u003e\n\u003ctd\u003eNeutral Density ND96-0.9 (13% Light Transmission)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter 2\u003c\/td\u003e\n\u003ctd\u003eNeutral Density ND96-0.6 (25% Light Transmission)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter 3\u003c\/td\u003e\n\u003ctd\u003eNeutral Density ND96-0.3 (50% Light Transmission)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter 4\u003c\/td\u003e\n\u003ctd\u003eMoon \u0026amp; Sky Glow (Light Purple)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndividual Filter Weight\u003c\/td\u003e\n\u003ctd\u003e0.21 oz (6 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight (Filters \u0026amp; Case)\u003c\/td\u003e\n\u003ctd\u003e2.61 oz (74 g)\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\u003cimg class=\"DAV-img-box\" alt=\"ND96-0.9 Filter (13%)\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eND96-0.9 Neutral Density Filter (13% transmission)\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\u003cimg class=\"DAV-img-box\" alt=\"ND96-0.6 Filter (25%)\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eND96-0.6 Neutral Density Filter (25% transmission)\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\u003cimg class=\"DAV-img-box\" alt=\"ND96-0.3 Filter (50%)\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eND96-0.3 Neutral Density Filter (50% transmission)\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\u003cimg class=\"DAV-img-box\" alt=\"Moon \u0026amp; Sky Glow Filter\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMoon and Sky Glow 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\u003cimg class=\"DAV-img-box\" alt=\"Foam-Lined Plastic Storage Case\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFoam-Lined Plastic 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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Printed Moon Map with Legend\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePrinted Moon Map with Legend\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\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_Lunar_Landscapes_eBook.pdf?v=1782200921\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Lunar Landscapes eBook\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967145603357,"sku":"CEL-94315","price":83.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-Moon-Filter-Set-1-25-inch-94315-1__78612.1594229182.1280.1280.jpg?v=1684337125"},{"product_id":"celestron-lunar-and-planetary-filter-set-1-25","title":"Celestron Lunar and Planetary Filter Set - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFour essential 1.25\" planetary filters: #12 Deep Yellow, #21 Orange, #80A Blue, and ND-96-0.3\u003c\/li\u003e\n\u003cli\u003eEnhances specific details on the Moon, Mars, Jupiter, and Saturn\u003c\/li\u003e\n\u003cli\u003eNeutral Density filter reduces brightness without altering color\u003c\/li\u003e\n\u003cli\u003eEach filter features a 26mm clear aperture and anti-reflection coatings\u003c\/li\u003e\n\u003cli\u003eDouble-threaded cells allow for stacking filters\u003c\/li\u003e\n\u003cli\u003eIncludes a hard plastic case for safe storage\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\u003eCelestron Lunar and Planetary Filter Set - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Lunar and Planetary Filter Set groups four essential 1.25” filters to reveal specific surface and atmospheric details that are often invisible without them. This kit includes a #12 Deep Yellow, #21 Orange, #80A Blue, and an ND-96-0.3 Neutral Density filter, each with a 26mm clear aperture and anti-reflection coatings. The double-threaded aluminum cells allow you to stack filters, giving you advanced control over the light reaching your eyepiece.\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\u003e#12 Deep Yellow: A 1.25\" Filter for General Planetary and Lunar Contrast\u003c\/h3\u003e\n\u003cp\u003eThe #12 Deep Yellow filter is an excellent starting point for enhancing contrast, particularly in telescopes with apertures under 4.5 inches. On the Moon, it darkens the blue-tinted maria, making subtle rilles and crater rays stand out more clearly. For planetary observers, this filter improves the visibility of equatorial belts on Jupiter and Saturn and helps define the polar ice caps and cloud structures on Mars.\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\u003e#21 Orange \u0026amp; #80A Blue: High-Contrast Filters for Jupiter and Mars\u003c\/h3\u003e\n\u003cp\u003eThis set includes two filters targeted at specific planetary features. The #21 Orange filter is a powerful tool for Mars, sharpening the boundaries between its reddish-orange deserts and darker plains by blocking blue and green wavelengths. The #80A Blue filter excels at enhancing contrast within the cloud belts of Jupiter and highlighting the delicate structure of Saturn's polar regions and rings.\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\u003eND-96-0.3 Neutral Density: Taming Lunar Glare and Splitting Double Stars\u003c\/h3\u003e\n\u003cp\u003eObserving the Moon at high magnification can be uncomfortably bright, washing out fine detail. The ND-96-0.3 filter reduces overall brightness without changing the Moon's natural color, allowing your eye to perceive more subtle surface features. This filter is also invaluable for separating close binary stars, as it can dim the brighter primary star just enough to reveal its fainter companion.\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\u003e26mm Clear Aperture: Stacking Filters for Custom Transmissions\u003c\/h3\u003e\n\u003cp\u003eEach filter is mounted in a black anodized aluminum cell with a 26mm clear aperture, ensuring no vignetting with standard 1.25\" eyepieces. The cells are threaded on both sides, a critical design choice that allows you to stack filters. For example, you can combine the ND-96-0.3 filter with one of the color filters to simultaneously reduce brightness and boost contrast on a bright target like Jupiter.\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\"\u003eWhich filter in the Celestron Set is best for observing Jupiter's Great Red Spot?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e#80A Blue filter\u003c\/strong\u003e is the most effective choice in this set for enhancing the visibility of Jupiter's Great Red Spot. It increases the contrast between the reddish storm system and the surrounding lighter cloud zones.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a filter from the Celestron Lunar and Planetary Filter Set to my eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAll filters in this set are designed for 1.25\" eyepieces. Simply screw the filter into the threads on the bottom barrel of your eyepiece. You can then insert the eyepiece into your telescope's focuser as usual.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the #12 Deep Yellow filter from this set on Mars with a 3\" refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the #12 Deep Yellow is an excellent choice for smaller aperture telescopes (less than 4.5\"), making it a good match for a 3\" refractor. It will help bring out details in the Martian polar ice caps and any potential cloud formations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"stacking\" filters mean with the Celestron 1.25\" Filter Set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBecause each filter cell is double-threaded, you can screw one filter directly onto another. This allows you to combine their properties. For instance, stacking the ND-96-0.3 filter with the #21 Orange filter would reduce Mars's overall brightness while still sharpening surface details, which can be useful in larger telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a Neutral Density filter included in the Celestron Planetary Filter Set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ND-96-0.3 Neutral Density filter is primarily for lunar observation. A full or quarter Moon can be overwhelmingly bright, causing eye strain and hiding detail. The ND filter dims the view to a more comfortable level. It is also useful for splitting unequal binary stars, where the glare from the brighter star can hide its companion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill these filters work with a 2\" eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this Celestron filter set is specifically designed with 1.25\" filter threads and will only attach to 1.25\" eyepieces and accessories. They are not large enough to be used with 2\" eyepieces.\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\u003eFilter Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e26 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Filters\u003c\/td\u003e\n\u003ctd\u003e#12 Deep Yellow, #21 Orange, #80A Blue, ND-96-0.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Material\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eDouble-threaded for stacking\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eAnti-reflection, anti-ghosting, scratch-resistant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2-Year Warranty\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\"\u003e#12 Deep Yellow Filter (1.25\")\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\"\u003e#21 Orange Filter (1.25\")\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\"\u003e#80A Blue Filter (1.25\")\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\"\u003eND-96-0.3 Neutral Density Filter (1.25\")\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 Carrying 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\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967149207837,"sku":"CEL-94119-10","price":76.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Lunar-and-Planetary-Filter-Set-1-25-inch-94119-10-1__26681.1594230264.1280.1280.jpg?v=1684337236"},{"product_id":"celestron-oxygen-iii-narrowband-filter-1-25-in","title":"Celestron Oxygen III Narrowband Filter - 1.25 in","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIsolates doubly-ionized oxygen lines (496nm and 501nm)\u003c\/li\u003e\n\u003cli\u003eProvides extreme contrast for planetary and emission nebulae\u003c\/li\u003e\n\u003cli\u003eBlocks the entire visual spectrum from 400nm to 700nm\u003c\/li\u003e\n\u003cli\u003eUltra-hard, vacuum-deposited coatings prevent halos on bright stars\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" threaded barrel\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\u003eDownloads\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\u003eCelestron Oxygen III Narrowband Filter - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Oxygen III Narrowband Filter for 1.25\" eyepieces isolates the critical 496nm and 501nm wavelengths emitted by planetary and emission nebulae, delivering a dramatic increase in contrast. By aggressively blocking the rest of the visual spectrum from 400nm to 700nm, this filter renders the sky background nearly black, allowing the faint, detailed structures of nebulae to become visible. Its ultra-hard, vacuum-deposited coatings are engineered to eliminate the unnatural colored halos around bright stars that can compromise views with less advanced filters.\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\u003eIsolating the 496nm \u0026amp; 501nm OIII Lines for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eMany of the most sought-after celestial objects, including the Veil, Ring (M57), and Orion (M42) nebulae, radiate strongly in the green-blue light of doubly-ionized oxygen (OIII). This filter acts as a gateway, passing only these two specific spectral lines at 496nm and 501nm. This narrowband approach rejects light pollution, natural skyglow, and even the light from surrounding stars, causing faint nebular structures to stand out with striking clarity.\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\u003eAdvanced Coatings: Blocking the 400-700nm Spectrum to Eliminate Halos\u003c\/h3\u003e\n\u003cp\u003eA common issue with inferior nebula filters is the appearance of bright, colored halos around stars, an artifact of imprecise coating technology. Celestron's OIII filter uses ultra-hard, vacuum-deposited coatings that provide complete rejection of the visual spectrum from 400nm to 700nm outside the narrow OIII bandpass. This careful engineering ensures that bright stars remain tight, point-like sources without distracting artifacts, preserving the natural beauty of the starfield.\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\u003eCelestron OIII vs. UHC Filters: Choosing the Right Tool for the Target\u003c\/h3\u003e\n\u003cp\u003eAn OIII filter is a specialist's tool, while a UHC (Ultra High Contrast) filter is a generalist. The Celestron OIII provides the highest possible contrast on objects that are rich in Oxygen-III emissions, like the Dumbbell Nebula (M27) or the Crescent Nebula (NGC 6888). A UHC filter has a broader bandpass that also includes Hydrogen-Beta light, making it useful on a wider variety of nebulae but with less pronounced contrast on OIII-specific targets. For revealing the faintest details in planetary nebulae, the OIII is the superior choice.\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 is the primary purpose of the Celestron Oxygen III 1.25\" filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary purpose is to dramatically increase the contrast of specific celestial objects—namely \u003cstrong\u003eplanetary and emission nebulae\u003c\/strong\u003e—by isolating the two wavelengths of light (496nm and 501nm) they predominantly emit. This makes faint details, like the filaments in the Veil Nebula, much easier to see, especially from light-polluted locations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Celestron OIII filter improve my view of the Orion Nebula (M42) in an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8\" Schmidt-Cassegrain Telescope, the Celestron OIII filter will suppress the brightness of the Trapezium stars at the core of the Orion Nebula (M42), reducing glare and revealing the delicate, interwoven structures of the surrounding gas clouds. You'll be able to trace the intricate loops and wisps of nebulosity that are normally overwhelmed by the brilliance of the central stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I see the Ring Nebula (M57) from my suburban backyard with this OIII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Ring Nebula (M57) is an excellent target for this filter. From a suburban location, the filter will darken the bright sky background, making the \"donut\" shape of the nebula pop into view with much greater contrast. It will also make it easier to detect the faint central star under steady seeing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this filter make stars disappear?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter will significantly dim most stars, which is intentional. Stars emit light across the entire spectrum, and the filter blocks almost all of it. This dimming effect is what enhances the contrast of the nebula, which shines brightly in the specific OIII wavelengths that the filter transmits.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Celestron OIII filter useful for viewing galaxies?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is not recommended for galaxies. Galaxies like Andromeda (M31) are broadband objects, meaning they emit light across the entire visible spectrum. An OIII filter would block almost all of that light, making the galaxy invisible or extremely dim. For galaxies, a light pollution reduction (LPR) filter or no filter is best.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Celestron 1.25\" OIII filter for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for visual use, this filter can be used for imaging, particularly with monochrome cameras. It serves as the \"O\" in an \"SHO\" (Hubble palette) image, isolating the Oxygen-III data. For color cameras, a multi-bandpass filter is often a more efficient choice, but this filter will work to capture OIII signal.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNarrowband Interference Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesignation\u003c\/td\u003e\n\u003ctd\u003eOxygen-III (OIII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Bandpass\u003c\/td\u003e\n\u003ctd\u003e496nm and 501nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e400nm - 700nm (full visual spectrum outside of bandpass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eUltra-hard, multi-layer, vacuum-deposited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eStandard 1.25\" filter threads (M28.5 x 0.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2-Year Warranty\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\"\u003eCelestron Oxygen III Narrowband Filter - 1.25\"\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\"\u003eProtective Plastic 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\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967149338909,"sku":"CEL-93623","price":132.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Oxygen-III-Narrowband-Filter-1-25-in-93623-1__27739.1594230265.1280.1280.jpg?v=1684337235"},{"product_id":"celestron-oxygen-iii-narrowband-filter-2-in","title":"Celestron Oxygen III Narrowband Filter - 2 in","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIsolates the 496nm and 501nm Oxygen III wavelengths\u003c\/li\u003e\n\u003cli\u003eBlocks the entire visual spectrum from 400nm to 700nm\u003c\/li\u003e\n\u003cli\u003eUltra-hard, vacuum-deposited coatings prevent halos\u003c\/li\u003e\n\u003cli\u003eStandard 2\" filter threads\u003c\/li\u003e\n\u003cli\u003e2-Year Warranty\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\u003eCelestron Oxygen III Narrowband Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Oxygen III Narrowband Filter - 2\" is engineered to pass only the critical 496nm and 501nm wavelengths characteristic of doubly-ionized oxygen. By aggressively blocking the rest of the visual spectrum from 400nm to 700nm, it creates extreme contrast for viewing and imaging planetary and emission nebulae. This filter comes with a 2-Year Warranty, ensuring its advanced coatings perform session after session.\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\u003eIsolating the 496nm \u0026amp; 501nm OIII Signal\u003c\/h3\u003e\n\u003cp\u003eThe faint, intricate structures within emission nebulae like the Veil Nebula or the Crescent Nebula are revealed primarily through the light of excited oxygen atoms. This filter isolates just the two OIII emission lines at 496nm and 501nm, effectively turning off the light from other sources, including light pollution and even the stars themselves. The result is a dramatic increase in contrast, allowing the delicate filaments and shells of these objects to stand out against a truly black sky background.\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\u003eA 400-700nm Stoplight for Unwanted Star Halos\u003c\/h3\u003e\n\u003cp\u003eUnlike simpler filters, the Celestron OIII uses ultra-hard, vacuum-deposited coatings to block the entire visual spectrum from 400nm to 700nm. This meticulous approach to light suppression does more than just darken the sky—it eliminates the unnatural, colored halos that can appear around bright stars in less sophisticated designs. Your starfields remain sharp and natural, ensuring the nebula, not distracting artifacts, is the focus of your view.\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\"\u003eHow does the Celestron 2\" OIII filter improve views of the Veil Nebula?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Veil Nebula is a classic supernova remnant that shines almost exclusively in Oxygen III and Hydrogen-alpha light. By isolating the OIII lines at \u003cstrong\u003e496nm and 501nm\u003c\/strong\u003e, this filter dramatically darkens the sky background, making the faint, thread-like filaments of the nebula appear significantly brighter and more detailed, even from moderately light-polluted skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Celestron Oxygen III filter for imaging the Orion Nebula (M42) from my backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an excellent application for the filter. The core of the Orion Nebula is rich in OIII emission. Using the Celestron OIII filter will help you capture the intricate details within the Trapezium region and the surrounding nebulosity by rejecting broadband light pollution and reducing the overwhelming brightness of the nebula's stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Celestron OIII filter help me see galaxies or star clusters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is not designed for broadband targets like galaxies and star clusters. These objects emit light across the entire visual spectrum. The OIII filter will block almost all of their light, making them extremely dim or completely invisible. It is a specialized tool exclusively for emission and planetary nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of blocking the spectrum from 400nm to 700nm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis comprehensive blocking ensures maximum contrast by eliminating all sources of visual light except for the targeted OIII wavelengths. A key benefit of this design is the prevention of bloated stars and colored halos, which can occur when filters have \"leaks\" or less precise cutoff points, leading to cleaner and more aesthetically pleasing astrophotos.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Celestron 2\" OIII filter threaded for standard eyepieces and accessories?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Celestron Oxygen III Narrowband Filter - 2\" is housed in a standard 2-inch cell with M48x0.75 threads. It will screw directly into the barrel of any 2\" eyepiece, diagonal, or imaging accessory that accepts standard 2\" filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are there two passbands at 496nm and 501nm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDoubly-ionized oxygen naturally emits light at both of these very close wavelengths. A high-quality OIII filter is designed to pass both lines to maximize the signal gathered from the nebula, resulting in a brighter and more detailed image than a filter that might only capture one.\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\u003eFilter Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Wavelengths\u003c\/td\u003e\n\u003ctd\u003e496nm \u0026amp; 501nm (Doubly-ionized Oxygen)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e400nm - 700nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eUltra-hard, multi-layer, vacuum-deposited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2-Year Warranty\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\"\u003eCelestron Oxygen III Narrowband Filter - 2\"\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\"\u003eProtective 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\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967149371677,"sku":"CEL-93624","price":174.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Oxygen-III-Narrowband-Filter-2-in-93624-1__08282.1594230265.1280.1280.jpg?v=1684337236"},{"product_id":"celestron-moon-filter-1-25","title":"Celestron Moon Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces overwhelming brightness and glare from the Moon\u003c\/li\u003e\n\u003cli\u003eEnhances contrast to reveal finer surface details\u003c\/li\u003e\n\u003cli\u003eThreads directly onto most standard 1.25\" eyepieces\u003c\/li\u003e\n\u003cli\u003eImproves viewing comfort, especially near the full moon phase\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\u003eCelestron Moon Filter - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Moon Filter - 1.25\" is an essential accessory for observing our nearest celestial neighbor. By reducing the Moon's intense brightness, this filter allows your eye to relax and open up, revealing subtle details in crater walls, rilles, and mare that are otherwise lost to glare. Backed by a 2-year warranty, it simply threads onto any standard 1.25\" eyepiece to instantly improve your lunar viewing experience.\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\u003eReduce Glare and See More Detail on the Moon\u003c\/h3\u003e\n\u003cp\u003eViewing the Moon, especially when it is near full, can be uncomfortably bright through a telescope. Your eye reacts to the intense light by stopping down, which hides faint contrasts and washes out surface features. The Celestron Moon Filter acts like a pair of high-quality sunglasses for your telescope, dimming the view to a comfortable level and significantly increasing contrast between light and dark areas.\u003c\/p\u003e\n\u003cp\u003eThis reduction in glare is the key to unlocking finer details. With the filter in place, you can comfortably study the complex ejecta blankets around prominent craters, trace the delicate lines of sinuous rilles, and distinguish between the different lava flows that formed the lunar seas billions of years ago.\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\u003eSimple 1.25\" Thread-On Design for Instant Use\u003c\/h3\u003e\n\u003cp\u003eThis filter is designed for immediate and universal use. It features standard 1.25\" filter threads that screw directly onto the barrel of most 1.25\" eyepieces, regardless of the brand. Installation takes only a few seconds, transforming any of your standard eyepieces into a specialized tool for lunar observation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Fit:\u003c\/strong\u003e Compatible with any eyepiece that has a standard 1.25\" filter thread, making it a versatile addition to your accessory case.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBeyond the Moon:\u003c\/strong\u003e The filter is also effective at cutting the glare from Venus, allowing you to more easily discern its phases. It can also be used to dim very bright terrestrial scenes during daytime observation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImportant Safety Note:\u003c\/strong\u003e This filter is designed for lunar and planetary viewing only. It is absolutely \u003cstrong\u003enot\u003c\/strong\u003e a solar filter and must never be used to observe the Sun.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIs the Celestron 1.25\" Moon Filter Right for You?\u003c\/h3\u003e\n\u003cp\u003eIf you've ever found yourself squinting at the eyepiece while observing the Moon, this filter is a necessary accessory. It's the single most effective and affordable upgrade for anyone looking to move beyond casual glances and begin serious lunar exploration. For a minimal investment, you gain the ability to see more detail and observe for longer periods in greater comfort.\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\"\u003eWhy do I need a Celestron Moon Filter to observe the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Moon is extremely bright through a telescope, especially around its full phase. This brightness causes your pupil to contract, hiding faint details and causing eye strain. The Celestron Moon Filter reduces the light to a comfortable level, which improves contrast and allows you to see much finer surface features like small craters and rilles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Celestron Moon Filter help me see the craters Copernicus and Tycho more clearly in my 6\" Newtonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. For bright targets like Copernicus and the extensive ray system of Tycho, the filter will cut the overwhelming glare, making the crater walls, central peaks, and surrounding ejecta blankets stand out with much greater clarity. It allows you to study these features for longer periods without discomfort.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the 1.25\" Moon Filter to my eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter simply screws into the threads on the bottom of the barrel of most standard 1.25\" eyepieces. Just unthread the eyepiece from your focuser or diagonal, attach the filter, and place the eyepiece back in. It takes only a few seconds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Celestron Moon Filter change the color of the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMost standard moon filters are neutral density filters, meaning they reduce brightness across the entire visual spectrum equally. This dims the view without introducing any significant color cast, preserving the Moon's natural grey and white tones.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Celestron Moon Filter to see the phases of Venus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the filter is very helpful for observing Venus. Venus is the brightest planet and its glare can make it difficult to see its phase clearly. The Moon Filter reduces this glare, providing a much sharper and more defined view of its crescent or gibbous shape.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Celestron filter to look at the Sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNEVER.\u003c\/strong\u003e You must never use this Moon Filter, or any eyepiece filter, to view the Sun. It will not block the harmful infrared and ultraviolet radiation and will lead to immediate and permanent eye damage. Only use a certified solar filter that covers the entire front of your telescope.\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\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003eMoon Filter - 1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2-Year Warranty\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\"\u003eCelestron Moon Filter - 1.25\"\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\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967149502749,"sku":"CEL-94119-A","price":18.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-1-25-inch-Moon-Filter-94119-A-1__47885.1594231057.1280.1280.jpg?v=1684337244"},{"product_id":"celestron-neutral-density-moon-filter-1-25","title":"Celestron Neutral Density Moon Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces overwhelming brightness from the Moon and bright planets\u003c\/li\u003e\n\u003cli\u003eTransmits only 13% of incoming light for comfortable viewing\u003c\/li\u003e\n\u003cli\u003eFits all standard 1.25\" eyepieces and accessories\u003c\/li\u003e\n\u003cli\u003eNeutral density glass provides true-color views without color shifting\u003c\/li\u003e\n\u003cli\u003eStackable design allows use with other planetary filters\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\u003eCelestron Neutral Density Moon Filter - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Neutral Density Moon Filter for 1.25\" eyepieces makes lunar observing comfortable by cutting overwhelming glare with a specific 13% light transmission rate. This 6 g filter threads into a durable aluminum cell housing, preserving the Moon's natural colors without the tint introduced by color filters. Its stackable design allows you to combine it with other filters to enhance specific planetary features.\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\u003eReduce Lunar Glare with 13% Light Transmission\u003c\/h3\u003e\n\u003cp\u003eA bright Moon can easily wash out surface detail and cause significant eye strain, especially through a larger telescope. This filter solves the problem by blocking 87% of the incoming light, allowing only a comfortable 13% to pass through to your eye. This reduction in brightness reveals subtle features like crater rays, rilles, and maria that are otherwise lost in the glare, transforming an overpowering view into a detailed exploration.\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\u003eNeutral Density Design: A True-Color View of the Moon\u003c\/h3\u003e\n\u003cp\u003eUnlike simple colored filters that cut glare but also add an unnatural green or blue cast, this is a true neutral density filter. It reduces the brightness across the entire visible spectrum evenly, so the image you see is dimmed but not color-shifted. You see the Moon's subtle grays, browns, and whites exactly as they are, providing a more authentic and scientifically useful view than a basic #58 green filter can offer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminum Cell Housing:\u003c\/strong\u003e The 31mm x 11.5mm filter is housed in a precision-machined aluminum cell for durability and secure threading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStackable Threads:\u003c\/strong\u003e The cell is threaded on both sides, allowing you to stack it with other 1.25\" filters, such as a light blue filter to enhance detail on Jupiter while simultaneously cutting its glare.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBeyond the Moon: Increasing Contrast on Planets and Double Stars\u003c\/h3\u003e\n\u003cp\u003eThis filter's utility isn't limited to the Moon. The 13% transmission is also highly effective for reducing the glare from bright planets like Venus and Jupiter, making it easier to spot faint cloud details or moons close to the planet's disk. For observers of binary stars, dimming a bright primary star can be the key to cleanly splitting a close, faint companion from its glare.\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\"\u003eWhy use a 13% transmission filter for the Celestron Moon Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 13% transmission is considered the sweet spot for lunar viewing. It's dark enough to cut the painful glare of a full or gibbous Moon, especially in telescopes 6\" or larger, but not so dark that it extinguishes detail on dimmer crescent phases. It provides a comfortable, high-contrast view across the entire lunar cycle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Celestron Neutral Density Moon Filter compare to a color filter like a #58 Green?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile both reduce brightness, the Neutral Density filter provides a true-color image by dimming all wavelengths of light equally. A #58 Green filter absorbs red and blue light, creating an artificial green tint. For accurate lunar and planetary observing, the Neutral Density filter is superior.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Celestron filter for viewing Venus's phases?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. Venus is intensely bright, which often creates internal reflections and makes its subtle crescent phase difficult to see cleanly. This filter's 13% transmission cuts that glare significantly, providing a much sharper and more comfortable view of the planet's phases.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 1.25\" filter help me split close double stars like Sirius?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it can be a very useful tool. The primary star in a pair like Sirius (Alpha Canis Majoris) can completely overwhelm its faint companion, the Pup. By reducing the primary's glare with this filter, you increase the effective contrast, making it easier for your eye to pick out the nearby companion star.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Celestron Moon Filter stackable with other 1.25\" filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the aluminum cell housing is threaded on both sides. This allows you to screw another filter, like a color planetary filter, directly into it. For example, you could stack it with a #21 Orange filter to enhance detail in Mars's dust storms while also taming its brightness at opposition.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this filter work for solar observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNEVER.\u003c\/strong\u003e This filter is absolutely not safe for solar observing and must never be used to look at the Sun. It does not block the harmful infrared (IR) or ultraviolet (UV) radiation that causes instant and permanent eye damage. Safe solar observing requires a dedicated, full-aperture solar filter designed specifically for that purpose.\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\u003eSize Diameter\u003c\/td\u003e\n\u003ctd\u003e31.75mm (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Transmission\u003c\/td\u003e\n\u003ctd\u003e13%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNeutral Density\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Housing\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStackable\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Dimensions\u003c\/td\u003e\n\u003ctd\u003e31mm x 11.5mm (1.22\" x .45\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Weight\u003c\/td\u003e\n\u003ctd\u003e0.21 oz (6 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase Dimensions\u003c\/td\u003e\n\u003ctd\u003e54.5mm x 43mm x 18mm (2.14\" x 1.7\" x .7\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase Weight\u003c\/td\u003e\n\u003ctd\u003e0.5 oz (14 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Package Weight\u003c\/td\u003e\n\u003ctd\u003e0.88 oz (25 g)\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\"\u003eNeutral Density Moon Filter - 1.25\"\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\"\u003eProtective Plastic 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\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967149568285,"sku":"CEL-94105","price":28.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Neutral-Density-Moon-Filter-1-25-inch-94105-1__04155.1594230267.1280.1280.jpg?v=1684337250"},{"product_id":"celestron-variable-polarizing-filter-1-25","title":"Celestron Variable Polarizing Filter - 1.25”","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdjustable light transmission from 1% to 40%\u003c\/li\u003e\n\u003cli\u003eStandard 1.25” filter format fits most eyepieces\u003c\/li\u003e\n\u003cli\u003eReduces brightness without altering an object's natural color\u003c\/li\u003e\n\u003cli\u003eEnhances detail on the Moon and planets\u003c\/li\u003e\n\u003cli\u003eDurable and lightweight aluminum cell housing\u003c\/li\u003e\n\u003cli\u003eStackable design allows use with other filters\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\u003eDownloads\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\u003eCelestron Variable Polarizing Filter - 1.25”\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Variable Polarizing Filter for 1.25” eyepieces gives you precise control over image brightness, with an adjustable light transmission ranging from a dim 1% to a moderate 40%. Weighing just 0.56 oz (16 g), this filter dials in the perfect view of bright celestial objects by simply rotating the aluminum cell housing. Unlike fixed-transmission moon filters, this variable design allows you to adapt to changing seeing conditions or target altitudes in real-time.\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\u003eAdjustable Light Control: From 1% to 40% Transmission\u003c\/h3\u003e\n\u003cp\u003eThe core of this filter is its ability to act as a dimmer switch for your telescope. By rotating the lower ring of the two-piece filter, you can smoothly adjust the amount of light reaching your eye from 40% all the way down to just 1%. This is a significant advantage over single-transmission neutral density or moon filters, which often make the view too dark or not dark enough.\u003c\/p\u003e\n\u003cp\u003eThis level of control is essential for observing the Moon, where the ideal brightness changes dramatically with its phase. A full Moon requires maximum dimming to reduce glare and see fine rille and crater detail, while a thin crescent may only need a slight reduction in brightness. This filter adapts to any scenario without requiring you to swap out accessories.\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\u003eLunar and Daytime Planetary Observing: Enhanced Contrast Without Color Shift\u003c\/h3\u003e\n\u003cp\u003eThe Celestron Variable Polarizing Filter reduces brightness without altering the true color of the celestial object, a critical feature for both visual observers and astro-imagers. When viewing the Moon, this neutral filtration cuts through the overwhelming glare, allowing subtle details along the terminator to become clearly defined. For imagers, it prevents bright lunar highlands from being overexposed, preserving data in your final image.\u003c\/p\u003e\n\u003cp\u003eThis filter also excels at daytime astronomy. It can be used to darken the bright blue sky, dramatically increasing the contrast of Venus or Jupiter against the background. This makes it possible to locate and observe planets long before sunset, extending your available viewing time.\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\u003eSmart Design: Stackable 1.25” Aluminum Cell\u003c\/h3\u003e\n\u003cp\u003eBuilt with a lightweight yet durable aluminum cell housing, the filter adds only 0.56 oz (16 g) to your eyepiece, ensuring it won't create balance issues on your telescope. The standard 31.75mm (1.25\") filter threads are compatible with virtually all 1.25\" eyepieces and many accessories.\u003c\/p\u003e\n\u003cp\u003eFor advanced applications, the filter is stackable. Both sides of the housing are threaded, allowing you to attach additional filters, such as a color filter to bring out specific details on a planet's surface while simultaneously controlling its brightness. This adds another layer of utility, letting you create custom filter combinations for specific targets.\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\"\u003eWhy use the Celestron Variable Polarizing Filter instead of a standard Moon filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard Moon filter has a fixed light transmission (typically 13% or 25%). The Celestron Variable Polarizing Filter allows you to adjust the brightness from \u003cstrong\u003e1% to 40%\u003c\/strong\u003e. This means you can dial in the perfect brightness for any lunar phase, telescope aperture, or seeing condition, which is impossible with a fixed filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 1.25” filter change the color of planets like Jupiter or Mars?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it will not. The filter is designed to be color-neutral, reducing brightness across the visual spectrum evenly. This means Jupiter's cloud bands and Mars' polar caps will retain their natural colors, just at a more comfortable brightness level.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Celestron Variable Polarizing Filter help with viewing Venus during the day?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDaytime viewing is a challenge because the planet is faint against a bright blue sky. This filter darkens the sky background significantly, which increases the contrast and makes the planet \"pop\" into view. It allows you to find and observe planets that would otherwise be lost in the glare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack this filter with other 1.25\" filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The aluminum cell is threaded on both sides, making it fully stackable. You can, for example, thread it onto a #80A Blue filter to enhance details on Jupiter while also using the polarizing feature to reduce its overall brightness for more comfortable viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Celestron Variable Polarizing Filter difficult to adjust while on the eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it's designed for easy use at the telescope. Once threaded onto your 1.25\" eyepiece, you simply grip and rotate the bottom section of the filter housing. This smooth rotation changes the polarization angle, dimming or brightening the view without needing to remove the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this filter useful for deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGenerally, no. Deep-sky objects like galaxies and nebulae are extremely faint, and the goal is to gather as much light as possible. This filter is designed to reduce the light from very bright objects like the Moon, planets, and double stars. Using it on a faint nebula would make it invisible.\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\u003eSize Diameter\u003c\/td\u003e\n\u003ctd\u003e31.75mm (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Transmission\u003c\/td\u003e\n\u003ctd\u003eAdjustable (1% to 40%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Housing\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStackable\u003c\/td\u003e\n\u003ctd\u003eYes, threaded on both sides\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Dimensions\u003c\/td\u003e\n\u003ctd\u003e31.4mm x 22.4mm (1.23\" x .88\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Weight\u003c\/td\u003e\n\u003ctd\u003e0.56 oz (16 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase Dimensions\u003c\/td\u003e\n\u003ctd\u003e68mm x 28mm (2.67\" x 1.1\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase Weight\u003c\/td\u003e\n\u003ctd\u003e0.91 oz (26 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Package Weight\u003c\/td\u003e\n\u003ctd\u003e1.7 oz (50 g)\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\u003cimg class=\"DAV-img-box\" alt=\"Celestron 1.25-inch Variable Polarizing Filter\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-Variable-Polarizing-Filter-1.25-1.jpg?v=1782256863\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eVariable Polarizing Filter - 1.25”\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\u003cimg class=\"DAV-img-box\" alt=\"Plastic protective case for the filter\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-Filter-Case-1.25-1.jpg?v=1782256863\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFilter 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\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967149601053,"sku":"CEL-94107","price":60.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Variable-Polarizing-Filter-1-25-inch-94107-1__57811.1594229204.1280.1280.jpg?v=1684337258"},{"product_id":"explore-scientific-nebula-filter-h-beta-2-0","title":"Explore Scientific Nebula Filter H-Beta - 2.0\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2.0-inch Barrel Size\u003c\/li\u003e\n\u003cli\u003eIsolates Hydrogen-Beta (H-Beta) Emission Line\u003c\/li\u003e\n\u003cli\u003eDramatically Increases Contrast on Specific Nebulae\u003c\/li\u003e\n\u003cli\u003eBlocks Artificial Light Pollution\u003c\/li\u003e\n\u003cli\u003eStandard M48x0.75 Filter Threads\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\u003eDownloads\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\u003eExplore Scientific Nebula Filter H-Beta - 2.0\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific Nebula Filter H-Beta - 2.0\" is a specialized line filter designed to fit standard 2.0-inch eyepieces and filter wheels, isolating the faint hydrogen-beta emission line to reveal specific nebulae that are otherwise nearly invisible against a light-polluted sky.\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\u003eA 2.0-inch Filter for Hydrogen-Beta Emission\u003c\/h3\u003e\n\u003cp\u003eThis filter operates by blocking all wavelengths of light except for the narrow band corresponding to the hydrogen-beta emission line. This extreme selectivity darkens the sky background, effectively eliminating the glow from most forms of artificial lighting and allowing the faint structural details of specific nebulae to stand out with striking contrast.\u003c\/p\u003e\n\u003cp\u003eThe 2.0-inch format is critical for this filter's intended targets, which are often large and diffuse. Paired with a low-power, wide-field 2.0-inch eyepiece, you can frame these expansive objects in their entirety while gathering the maximum amount of light from your telescope's aperture.\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\u003eUnveiling \"Invisible\" Nebulae: The Horsehead and California Nebula\u003c\/h3\u003e\n\u003cp\u003eWhile many filters enhance a wide range of objects, the H-Beta filter is a specialist's tool for a select list of targets that are notoriously difficult to observe. Its primary purpose is to make the impossible, possible. For visual observers, this filter is often the only way to glimpse faint nebulae that are rich in H-beta emissions.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsehead Nebula (Barnard 33):\u003c\/strong\u003e This iconic dark nebula is nearly impossible to see visually without an H-Beta filter to enhance the faint glowing hydrogen gas (IC 434) behind it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalifornia Nebula (NGC 1499):\u003c\/strong\u003e A large, faint emission nebula in Perseus that glows almost exclusively in H-alpha and H-beta light. The H-Beta filter provides a dramatic contrast boost, making its shape discernible.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCocoon Nebula (IC 5146):\u003c\/strong\u003e Another challenging target where the H-Beta filter can help pull the faint nebulosity from the background sky.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eH-Beta vs. O-III: A Specialized Filter for Key Targets\u003c\/h3\u003e\n\u003cp\u003eAn Oxygen-III (O-III) or Ultra-High Contrast (UHC) filter is typically a better first choice for a general-purpose nebula filter, as it enhances a much broader range of objects, including planetary nebulae and the Orion Nebula (M42). The H-Beta filter is not intended to replace these.\u003c\/p\u003e\n\u003cp\u003eInstead, it complements them by excelling where they fall short. For the specific targets that emit strongly in the H-beta line, this filter provides a view that no other filter can match. It is an essential addition for the dedicated deep-sky observer looking to complete their \"life list\" of challenging celestial objects.\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\"\u003eWill the Explore Scientific H-Beta 2.0\" filter help me see the Horsehead Nebula (Barnard 33) with my 10-inch Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. For a visual observation of the Horsehead Nebula, an H-Beta filter is considered essential. In a 10-inch telescope under dark skies, this 2.0\" filter will significantly increase the contrast of the glowing IC 434 nebula behind the dark Horsehead silhouette, giving you the best possible chance to detect it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 2.0\" H-Beta filter a good choice for imaging the California Nebula (NGC 1499)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile this filter can be used for imaging, H-Beta is a much weaker signal than Hydrogen-Alpha (H-alpha). For monochrome astrophotography, an H-alpha filter will produce superior results on the California Nebula. However, for color imaging (especially with one-shot color cameras), adding data through an H-Beta filter can help capture a more accurate color balance in the blue channel for this specific object.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need an H-Beta filter if I already have a UHC or O-III filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUHC and O-III filters are excellent for the vast majority of emission and planetary nebulae. However, they do not pass the H-beta line with the same efficiency. For a small but famous list of objects like the Horsehead Nebula and California Nebula, the H-Beta filter provides a significantly better view, often making the difference between seeing the object and not seeing it at all.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Explore Scientific H-Beta filter effective against light pollution?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis filter works by isolating a very narrow portion of the light spectrum where the nebula's light is concentrated. It blocks most other wavelengths, including the common sources of light pollution like sodium and mercury vapor streetlights. This darkens the sky background, making the faint light of the nebula appear much brighter in comparison.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 2.0\" H-Beta filter work with my specific brand of eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Explore Scientific H-Beta filter is built in a standard 2.0-inch cell with M48x0.75 threads. This is the industry standard for 2.0\" astronomy filters and will thread into any 2.0\" eyepiece or filter wheel that has standard filter threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the H-Beta filter useful for any objects besides the Horsehead and California Nebulae?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile those are its primary targets, the H-Beta filter can also offer subtle enhancements on other objects. Some observers report it helps with the faint outer loops of the Veil Nebula complex in Cygnus and can bring out detail in the Flame Nebula (NGC 2024) near Alnitak. It is always worth experimenting with on various hydrogen-rich regions.\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\u003eFilter Size\u003c\/td\u003e\n\u003ctd\u003e2.0\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Emission Line\u003c\/td\u003e\n\u003ctd\u003eHydrogen-Beta (H-Beta)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257017232\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\"\u003eExplore Scientific Nebula Filter H-Beta - 2.0\"\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\"\u003eProtective 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\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967202783517,"sku":"ES-310230","price":251.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-Nebula-Filter-H-Beta-2-0-inch-310230-1__02827.1594240363.1280.1280.jpg?v=1684338905"},{"product_id":"explore-scientific-neutral-density-filter-nd-0-9-1-25","title":"Explore Scientific Neutral Density Filter ND 0.9 - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eND 0.9 Optical Density\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eReduces Glare for Lunar Observing\u003c\/li\u003e\n\u003cli\u003eAids in Splitting Unequal Double Stars\u003c\/li\u003e\n\u003cli\u003eUniform Light Transmission Across the Spectrum\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\u003eDownloads\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\u003eExplore Scientific Neutral Density Filter ND 0.9 - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific Neutral Density Filter ND 0.9 in a 1.25\" format is engineered to reduce overwhelming brightness from celestial objects without altering their natural color. This ND 0.9 filter, also referred to as an ND96, is essential for reducing glare and irradiation when observing the Moon, especially in telescopes with an aperture of 4\" (10.2cm) or larger.\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\u003eTaming Lunar Glare with ND 0.9 Density in 4\"+ Telescopes\u003c\/h3\u003e\n\u003cp\u003eObserving the Moon, particularly from the first quarter to full phase, can be uncomfortably bright through a telescope, causing your pupil to contract and washing out subtle surface details. The Explore Scientific ND 0.9 filter transmits light uniformly across the spectrum, dimming the view to a comfortable level. This reduction in brightness allows you to see finer details in crater walls, rilles, and maria without being overwhelmed by 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\u003eSplitting Unequal Double Stars with the ND 0.9 Filter\u003c\/h3\u003e\n\u003cp\u003eBeyond the Moon, this filter is a valuable tool for a more advanced observational challenge: splitting close double stars with a large magnitude difference. When one star in a binary pair significantly outshines its companion, its glare can completely hide the fainter star. The ND 0.9 filter dims the entire field, reducing the overpowering light from the primary star enough for the dimmer companion to become visible at the eyepiece.\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 \"ND 0.9\" mean for the Explore Scientific filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eND 0.9\u003c\/strong\u003e refers to the filter's optical density. This is a logarithmic scale, and an ND 0.9 filter transmits approximately 12.5% of the light that enters it, blocking the other 87.5%. This is a significant but not total reduction, making it a great general-purpose \"moon filter\" for a wide range of telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific ND 0.9 filter help for viewing planets like Jupiter or Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGenerally, a neutral density filter is not recommended for planetary viewing. While planets can be bright, an ND filter will dim them without enhancing any specific features. For planets, you are better served by color filters (like a light blue #80A or green #58) which can increase the contrast of specific atmospheric details like Jupiter's cloud bands or Mars' polar caps.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific ND 0.9 filter improve views of the full Moon in my 8\" f\/6 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. An 8\" telescope gathers a large amount of light, and a full Moon will be dazzlingly bright. The ND 0.9 filter is an excellent match for this aperture, cutting the glare to a comfortable level. This will relieve eye strain and allow you to resolve much finer details along the terminator and within bright ray craters like Tycho and Copernicus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm trying to split the double star Antares with my 4\" refractor. Will this ND 0.9 filter help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt can. Antares (Alpha Scorpii) is a classic example of an unequal double, with a bright red primary and a much fainter secondary companion. A 4\" telescope has the resolution to split them, but the glare from the primary is often the problem. The ND 0.9 filter will reduce that glare, giving you a better chance to spot the faint companion, Antares B, nestled close to the primary star.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Explore Scientific ND 0.9 filter change the color of the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it does not. The \"Neutral\" in Neutral Density means it is designed to reduce the intensity of all wavelengths of light equally. This ensures that the view is simply dimmer, but the natural grey and white tones of the lunar surface are preserved without introducing a color cast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack the Explore Scientific ND 0.9 filter with other 1.25\" filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The filter has standard 1.25\" filter threads (M28.5x0.6) on both sides, allowing you to stack it with other filters. For instance, you could stack it with a color filter to see if it helps with planetary viewing, or even stack it with another ND filter for an even greater dimming effect on a very large telescope.\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\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Density\u003c\/td\u003e\n\u003ctd\u003eND 0.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Aperture\u003c\/td\u003e\n\u003ctd\u003e4\" (10.2cm) and larger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257017201\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\"\u003eExplore Scientific Neutral Density Filter ND 0.9 - 1.25\"\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\"\u003eProtective 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\u003cp\u003eNo manual or software is available for this product.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967202816285,"sku":"ES-310245","price":69.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-Neutral-Density-Filter-1-25-inch-ND-0-9-310245-1__86920.1594240363.1280.1280.jpg?v=1684338909"},{"product_id":"chroma-jovian-methane-filter","title":"Chroma Jovian Methane Filter","description":"\u003c!-- more --\u003e\u003cp\u003eMethane absorption band filter. This filter enhances contrast when imaging objects containing significant levels of methane. Methane-rich components, such as in the atmosphere of the Jovian planets, will appear darker.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFilters designed for use with CCD and for f\/4.0 or slower\u003c\/li\u003e\n\u003cli\u003eNo reflections leading to image distortions or \"back reflections\"\u003c\/li\u003e\n\u003cli\u003eTransmitted wavefront better than 0.25 waves\/inch\u003c\/li\u003e\n\u003cli\u003eDurable sputter coatings\u003c\/li\u003e\n\u003cli\u003eParallelism: \u0026lt; 30 arcsec\u003c\/li\u003e\n\u003cli\u003eThickness: 3.0 +\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eExtremely durable coatings withstand humidity changes and extreme temperature fluxes and remain spectrally accurate\u003c\/li\u003e\n\u003cli\u003ein CWL and band pass adherence\u003c\/li\u003e\n\u003cli\u003eCapable of manufacturing large filters for large detectors: 50mm x 50mm, 65mm up to 76.2mm and 101.6mm square\u003c\/li\u003e\n\u003cli\u003eAll filters manufactured in Vermont\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChroma manufactures the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.\u003c\/p\u003e\u003cp\u003eHighly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity. All filters may be used with apertures of f\/4 or smaller. They provide custom coating services for more demanding imaging applications requiring larger apertures such as f\/3 or f\/2. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25\" Round Mounted","offer_id":44967248363805,"sku":"CT-27012-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967248396573,"sku":"CT-27012-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967248429341,"sku":"CT-27012-36D","price":497.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967248462109,"sku":"CT-27012-2M","price":707.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967248494877,"sku":"CT-27012-50D","price":1092.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967248527645,"sku":"CT-27012-50X50","price":1106.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-Jovian-Methane-Filter__29695.1596071520.1280.1280.jpg?v=1684339724"},{"product_id":"baader-methane-filter-889nm-8nm-1-25","title":"Baader Methane Filter 889nm - 8nm 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e889nm Center Wavelength\u003c\/li\u003e\n\u003cli\u003e8nm Bandwidth (FWHM)\u003c\/li\u003e\n\u003cli\u003eTargets Methane Absorption Band\u003c\/li\u003e\n\u003cli\u003eHigh-Contrast Planetary Imaging\u003c\/li\u003e\n\u003cli\u003e1.25\" Filter Format\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\u003eDownloads\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\u003eBaader Methane Filter 889nm - 8nm 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Baader Methane Filter isolates a narrow 8nm bandpass centered at 889nm, a specific near-infrared wavelength designed for 1.25\" filter wheels to reveal high-altitude structures in the methane-rich atmospheres of Jupiter and Saturn. This filter transforms your view of gas giants from a simple color image into a scientific tool, creating high-contrast monochrome data that highlights features invisible in the visible spectrum.\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\u003ePlanetary Science: Imaging Jupiter and Saturn in the 889nm Methane Band\u003c\/h3\u003e\n\u003cp\u003eThe 889nm wavelength is significant because it corresponds to a strong methane absorption band. When you image a gas giant through this filter, the deep atmospheric layers rich in methane gas absorb this light and appear dark. Conversely, high-altitude clouds, storms, and hazes that sit above the main methane layer reflect sunlight and appear brilliantly bright, creating a stark, high-contrast image.\u003c\/p\u003e\n\u003cp\u003eOn Jupiter, this effect makes the Equatorial Zone and the Great Red Spot (GRS) stand out with dramatic clarity. For Saturn, you can capture details in its banded structure and detect seasonal polar storms that are otherwise washed out by the planet's muted visible-light appearance. This is not just a different view; it's a method for mapping the vertical structure of a planet's atmosphere.\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\u003eImaging Technique: The Demands of an 8nm Near-Infrared Bandpass\u003c\/h3\u003e\n\u003cp\u003eUsing the Baader Methane Filter requires a specific approach. Because it isolates a tight 8nm bandpass in the near-infrared—where silicon sensors are less sensitive—you will need longer exposure times or higher gain settings than with a standard luminance or IR-pass filter. This makes the filter best suited for telescopes with larger apertures that can gather sufficient light.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMonochrome Camera Required:\u003c\/strong\u003e This is a scientific filter designed for use with a monochrome astronomy camera to capture a detailed luminance layer. A color camera's Bayer matrix would block most of the incoming light and produce a very weak, unusable signal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeeing is Critical:\u003c\/strong\u003e The longer required exposures make this filter sensitive to atmospheric turbulence. For the best results, you should use it on nights of good to excellent seeing to resolve the fine details it's capable of revealing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eData Integration:\u003c\/strong\u003e The methane-band image is typically captured as a separate channel and can be colorized with RGB data to create a final composite that shows both the scientific detail from the 889nm band and the natural color of the planet.\u003c\/li\u003e\n\u003c\/ul\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\"\u003eHow will the Baader Methane Filter make Jupiter's Great Red Spot appear?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eJupiter's Great Red Spot (GRS) is a high-altitude storm system. Because it sits above much of the planet's atmospheric methane, it will reflect sunlight at 889nm and appear very bright through the \u003cstrong\u003eBaader Methane Filter\u003c\/strong\u003e, standing out in high contrast against the darker, methane-absorbing cloud belts surrounding it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader Methane Filter with a color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is not recommended for color cameras. The \u003cstrong\u003eBaader Methane Filter\u003c\/strong\u003e isolates a very narrow 8nm band of near-infrared light at 889nm. A color camera's Bayer matrix would block approximately 75% of this already-dim signal, resulting in extremely low efficiency and poor image quality. A monochrome camera is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Baader Methane Filter centered on the 889nm wavelength?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 889nm wavelength corresponds to a strong absorption line for methane gas. By imaging specifically at this wavelength, the \u003cstrong\u003eBaader Methane Filter\u003c\/strong\u003e allows astronomers to differentiate between deep, methane-rich atmospheric layers (which appear dark) and high-altitude features like clouds and storms (which appear bright).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of telescope works best with the Baader Methane Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBecause the filter has a narrow 8nm bandpass in the near-IR, it passes a limited amount of light. For this reason, the \u003cstrong\u003eBaader Methane Filter\u003c\/strong\u003e performs best with larger aperture telescopes (typically 8\" or more) that have greater light-gathering power. This helps to keep exposure times manageable and achieve a better signal-to-noise ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the narrow 8nm bandpass on the Baader Methane Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe narrow 8nm bandpass ensures that only light from the specific methane absorption band is recorded. This precision increases contrast by rejecting adjacent infrared wavelengths, darkening the methane-rich areas more effectively and making the high-altitude features stand out more sharply.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Methane Filter help with imaging Mars or the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is highly specialized for the methane-rich atmospheres of gas giants like Jupiter and Saturn. Mars has a very thin atmosphere with negligible methane, and the Moon has no atmosphere at all. Using the \u003cstrong\u003eBaader Methane Filter\u003c\/strong\u003e on these targets would only produce a very dim, low-contrast infrared image with no scientific benefit.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelength\u003c\/td\u003e\n\u003ctd\u003e889nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth (FWHM)\u003c\/td\u003e\n\u003ctd\u003e8nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Application\u003c\/td\u003e\n\u003ctd\u003ePlanetary Imaging (Gas Giants)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eCCD, Planetary, Specialty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003eMethan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003edielectrically coated, planeoptically polished\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\"\u003eBaader Methane Filter 889nm - 8nm 1.25\"\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\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Cleaning_and_Maintenance_of_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Cleaning and Maintenance of Optics Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967357776157,"sku":"BAA-2458295","price":348.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Methane-Filter-889nm-8nm-1-25-inch-1__14885.1597110939.1280.1280.jpg?v=1684341026"},{"product_id":"baader-contrast-booster-filter","title":"Baader Contrast-Booster Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnhances contrast for lunar and planetary observing\u003c\/li\u003e\n\u003cli\u003eSignificantly darkens skyglow background\u003c\/li\u003e\n\u003cli\u003eReveals subtle details in Jupiter's cloud belts and Mars's polar caps\u003c\/li\u003e\n\u003cli\u003eAvailable in standard 1.25\" and 2\" mounted formats\u003c\/li\u003e\n\u003cli\u003eThreads directly into standard eyepieces and accessories\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\u003eDownloads\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\u003eBaader Contrast-Booster Filter\u003c\/h2\u003e\n\u003cp\u003eThe Baader Contrast-Booster Filter, available in both 1.25\" and 2\" formats, is an essential tool for cutting through skyglow to reveal sharp, high-contrast details on the Moon and planets. By selectively filtering out wavelengths associated with common streetlights while passing critical light from celestial targets, this filter makes features like Jupiter's Great Red Spot, Martian surface markings, and subtle lunar rilles distinctly more visible.\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\u003e1.25\" \u0026amp; 2\" Filters for Enhanced Lunar and Planetary Contrast\u003c\/h3\u003e\n\u003cp\u003eThe core function of the Contrast-Booster is to increase the signal-to-noise ratio for bright objects against a brightened sky background. It aggressively blocks the yellow-orange glow from sodium and mercury-vapor streetlights, effectively darkening the space around your target. This allows the subtle colors and structures on planetary surfaces and the Moon to stand out dramatically.\u003c\/p\u003e\n\u003cp\u003eFor refractors, this filter serves a dual purpose by also cutting unfocused violet and blue light, which tightens star images and reduces chromatic aberration. The result is a cleaner, sharper view, particularly on challenging targets like the cloud bands of Jupiter and Saturn, where low-contrast details are easily lost to atmospheric scatter and optical imperfections.\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\u003eContrast-Booster vs. Standard Moon \u0026amp; Skyglow Filter: A Targeted Approach\u003c\/h3\u003e\n\u003cp\u003eWhile a generic Moon \u0026amp; Skyglow filter offers a mild reduction in light pollution with minimal color shift, the Baader Contrast-Booster is a more specialized instrument. Its transmission properties are more targeted, creating a more significant contrast enhancement at the cost of a more noticeable color cast in the image.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader Contrast-Booster:\u003c\/strong\u003e Ideal for pulling specific, faint details out of the glare on bright planets and the Moon. It excels at separating the zones and belts on Jupiter and defining the polar caps on Mars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Moon \u0026amp; Skyglow:\u003c\/strong\u003e A better choice for general-purpose, wide-field viewing where a more natural color balance is desired and the primary goal is simply to dim the sky background slightly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe trade-off is clear: for maximum detail on specific solar system targets, the Contrast-Booster's targeted filtering is superior. For casual, broad-field sweeping, a milder filter may be preferred.\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 is the primary purpose of the Baader Contrast-Booster Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader Contrast-Booster is designed to increase the visual contrast of lunar and planetary details. It achieves this by filtering out specific wavelengths of light associated with skyglow from artificial lighting, which darkens the background sky and makes faint features on bright objects easier to see.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader Contrast-Booster improve views of Jupiter in an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8\" SCT, the Baader Contrast-Booster will make Jupiter's atmospheric features significantly more distinct. It helps to separate the faint orange and brown hues of the cloud belts from the whiter zones. The Great Red Spot (GRS) becomes more clearly defined, and smaller ovals and festoons within the cloud structures are often revealed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader Contrast-Booster Filter for deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it can help darken the sky background, the Contrast-Booster is not a nebula filter. It is not optimized for the critical O-III and H-beta emission lines that define most nebulae. For targets like the Orion Nebula (M42) or Dumbbell Nebula (M27), a dedicated UHC or O-III filter will deliver far better results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Contrast-Booster Filter help with observing Mars?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Contrast-Booster is highly effective for Mars. It helps to define the boundaries of the dark albedo features like Syrtis Major against the bright ochre deserts. It is particularly useful for making the white polar caps stand out sharply against the planet's limb.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Baader Contrast-Booster Filter introduce a strong color cast?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, a noticeable color cast is a characteristic of this filter. Because it selectively removes portions of the visual spectrum, the resulting image will have a distinct bluish or greenish tint. This is a normal trade-off for the significant gain in contrast on planetary features.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this filter thread directly onto my 1.25\" and 2\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Baader Contrast-Booster filters are mounted in standard cells with standard filter threads. The \u003cstrong\u003e1.25\" version\u003c\/strong\u003e has M28.5 x 0.6 threads, and the \u003cstrong\u003e2\" version\u003c\/strong\u003e has M48 x 0.75 threads, allowing them to screw directly into the barrels of most eyepieces, diagonals, and other accessories.\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\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Round Mounted, 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eContrast Enhancement, Color Correction, IR-Cut, Planetary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003emultiple bands (see spectral image)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group, planeoptically polished\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\" Round Mounted","offer_id":44967360135453,"sku":"BAA-2458360","price":130.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967360168221,"sku":"BAA-2458365","price":209.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Contrast-Booster-Filter-1__53178.1597110973.1280.1280.jpg?v=1684341355"},{"product_id":"baader-individual-color-filter-dark-blue-bright-blue-green-yellow-red-orange","title":"Baader Individual Color Filter - Dark Blue, Bright Blue, Green, Yellow, Red, Orange","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAvailable in 6 distinct colors for targeted planetary observation\u003c\/li\u003e\n\u003cli\u003ePlaneoptically polished to 30 arcseconds for zero image degradation\u003c\/li\u003e\n\u003cli\u003e7-layer anti-reflection coatings reduce reflections to less than 0.25%\u003c\/li\u003e\n\u003cli\u003eNon-ageing sealed coating edges for lifetime durability\u003c\/li\u003e\n\u003cli\u003eOffered in standard 1.25\" and 2\" mounted sizes\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\u003eDownloads\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\u003eBaader Individual Color Filters\u003c\/h2\u003e\n\u003cp\u003eThe Baader Individual Color Filters redefine planetary viewing with an advanced 7-layer anti-reflection coating that reduces reflections to just 0.25% per surface for maximum contrast and light throughput. Each filter is planeoptically polished to a precision of 30 arcseconds, ensuring that no optical degradation occurs even at the highest magnifications. With options like the 470nm Light Blue for enhancing Jupiter's Great Red Spot or the 610nm Red for resolving Martian surface details, this series provides scientifically-targeted contrast enhancement far beyond simple colored glass.\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\u003eThe Baader Optical Standard: 0.25% Reflection and 30 Arcsecond Polish\u003c\/h3\u003e\n\u003cp\u003eUnlike standard color filters which are often just dyed glass, every Baader filter is built on a substrate that is planeoptically polished to a 30 arcsecond tolerance. This prevents the introduction of astigmatism or other aberrations into your light path, preserving the sharpness delivered by your telescope. The surfaces then receive a 7-layer dielectric coating, which creates the filter's precise bandpass while suppressing reflections to under 0.25%.\u003c\/p\u003e\n\u003cp\u003eThe result is a view with significantly higher contrast, free from the ghosting and scattered light that plagues lesser filters. To ensure a lifetime of use, Baader seals the coating edges, making them non-ageing and resistant to moisture intrusion.\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\u003e6 Colors for Planetary Contrast: From Venus to Mars\u003c\/h3\u003e\n\u003cp\u003eEach filter in the series is designed to isolate specific wavelengths of light, enhancing the visibility of subtle features on planetary surfaces and in their atmospheres. Choosing the right color is key to revealing details that are otherwise invisible.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDark Blue (435nm Bandpass):\u003c\/strong\u003e Ideal for observing the atmospheric structures of Venus and enhancing detail in comet tails.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight Blue (470nm Bandpass):\u003c\/strong\u003e A superb all-around filter for Jupiter, it darkens reddish structures like the Great Red Spot and enhances contrast in the cloud belts. It also helps visualize high clouds on Mars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGreen (500nm Bandpass):\u003c\/strong\u003e Excellent for viewing Martian ice caps and dust storms. On Jupiter and Saturn, it boosts contrast in the cloud belts and zones.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYellow (495nm Longpass):\u003c\/strong\u003e Enhances red and orange features on Jupiter and Saturn and improves detail in the Martian maria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrange (570nm Longpass):\u003c\/strong\u003e A strong performer for Mars, it penetrates hazes and sharpens boundaries of surface features. Also darkens the belts of Jupiter and Saturn.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRed (610nm Longpass):\u003c\/strong\u003e Offers the highest contrast for Martian surface features like Syrtis Major, especially during moments of good seeing. Effectively cuts through blue atmospheric haze.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBandpass vs. Longpass: Understanding Your Filter Choice\u003c\/h3\u003e\n\u003cp\u003eThis series includes two types of filters: bandpass and longpass. The Blue and Green filters are bandpass, meaning they transmit a very specific, narrow range of wavelengths. This provides a more targeted, higher-contrast view of specific phenomena but results in a slightly dimmer overall image.\u003c\/p\u003e\n\u003cp\u003eThe Yellow, Orange, and Red filters are longpass, blocking shorter wavelengths and transmitting everything above their rated cutoff (e.g., the 610nm Red filter passes all light with a wavelength longer than 610nm). This produces a brighter, more natural-looking image and is excellent for improving general contrast and cutting through unsteady atmospheric seeing.\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\u003eBeyond Simple Color Glass: Why Baader's 7-Layer Coatings Matter\u003c\/h3\u003e\n\u003cp\u003eMany planetary filters on the market are made from \"colored-in-the-mass\" glass, where the color is part of the glass itself. This method can lead to lower light transmission and potential image degradation if the glass is not optically flat. Baader's approach is fundamentally different and superior.\u003c\/p\u003e\n\u003cp\u003eBy starting with a perfectly flat, clear substrate polished to 30 arcseconds and applying hard, multi-layer dielectric coatings, Baader achieves the desired color transmission without scattering light or distorting the wavefront. This meticulous process is why Baader filters can be used at high magnification for imaging and visual work without compromising the optical integrity of your system.\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\"\u003eWhich Baader color filter is best for observing Jupiter's Great Red Spot with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eBaader Light Blue (470nm) filter\u003c\/strong\u003e is an excellent choice. It significantly enhances the contrast of reddish features against the lighter cloud zones, making the Great Red Spot and other smaller ovals stand out more clearly. The Green (500nm) filter is also a great alternative for general cloud belt detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader Red (610nm) filter to see more detail on Mars with my 120mm refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The \u003cstrong\u003eBaader Red (610nm) longpass filter\u003c\/strong\u003e is one of the best for Martian observation. It provides maximum contrast for dark surface features (albedo markings) like Syrtis Major and helps define the edges of the polar ice caps. It is most effective when the atmospheric seeing is stable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between the Baader Light Blue (470nm) and Dark Blue (435nm) filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eLight Blue (470nm)\u003c\/strong\u003e is a general-purpose filter for enhancing red features on Jupiter and high-altitude clouds on Mars. The \u003cstrong\u003eDark Blue (435nm)\u003c\/strong\u003e has a narrower and shorter wavelength bandpass, making it more specialized for observing the subtle atmospheric details of Venus and the structure of comet tails.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are Baader color filters more expensive than other brands?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe cost reflects the superior manufacturing process. Unlike simple dyed glass, Baader filters use an optically flat substrate, polished to a 30 arcsecond precision, and apply a 7-layer dielectric coating. This ensures maximum light transmission, eliminates reflections, and guarantees that the filter will not degrade the image quality of your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre these Baader filters threaded for both the eyepiece barrel and a camera nosepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Both the 1.25\" and 2\" Baader filters feature standard male and female threads. You can thread them directly onto most eyepieces, camera nosepieces, filter wheels, and other accessories of the corresponding size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"planeoptically polished\" mean for a Baader color filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\"Planeoptically polished\" means the glass substrate of the filter is polished to be perfectly flat, to a precision of 30 arcseconds. This is a crucial step that prevents the filter itself from distorting the light passing through it, ensuring that the image remains as sharp at high magnification with the filter as it is without 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\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" and 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Polish\u003c\/td\u003e\n\u003ctd\u003ePlaneoptically polished to 30 arcseconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003e7-layer Anti-Reflection (AR) on both sides\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResidual Reflection\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.25% per surface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEdge Treatment\u003c\/td\u003e\n\u003ctd\u003eNon-ageing sealed coating edges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eOptically polished glass with dielectric coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDark Blue Filter\u003c\/td\u003e\n\u003ctd\u003e435nm Bandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Blue Filter\u003c\/td\u003e\n\u003ctd\u003e470nm Bandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGreen Filter\u003c\/td\u003e\n\u003ctd\u003e500nm Bandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYellow Filter\u003c\/td\u003e\n\u003ctd\u003e495nm Longpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrange Filter\u003c\/td\u003e\n\u003ctd\u003e570nm Longpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRed Filter\u003c\/td\u003e\n\u003ctd\u003e610nm Longpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01 (1.25\" Round Mounted \/ Bright Blue, 2\" Round Mounted \/ Bright Blue, 1.25\" Round Mounted \/ Dark Blue, 2\" Round Mounted \/ Dark Blue, 1.25\" Round Mounted \/ Green, 2\" Round Mounted \/ Green, 2\" Round Mounted \/ Orange, 1.25\" Round Mounted \/ Red, 2\" Round Mounted \/ Red, 1.25\" Round Mounted \/ Yellow, 2\" Round Mounted \/ Yellow)\u003cbr\u003e0.06 (1.25\" Round Mounted \/ Orange)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eColor, Planetary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass (1.25\" Round Mounted \/ Bright Blue, 2\" Round Mounted \/ Bright Blue, 1.25\" Round Mounted \/ Dark Blue, 2\" Round Mounted \/ Dark Blue, 1.25\" Round Mounted \/ Green, 2\" Round Mounted \/ Green)\u003cbr\u003eLongpass (1.25\" Round Mounted \/ Orange, 2\" Round Mounted \/ Orange, 1.25\" Round Mounted \/ Red, 2\" Round Mounted \/ Red, 1.25\" Round Mounted \/ Yellow, 2\" Round Mounted \/ Yellow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group, planeoptically polished\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\"\u003eBaader Individual Color Filter (Selected color and size)\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\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Cleaning_and_Maintenance_of_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Cleaning and Maintenance of Optics Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Color_Filters_Product_Information.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Color Filters Product Information\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\" Round Mounted \/ Bright Blue","offer_id":44967360561437,"sku":"BAA-2458303","price":75.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Bright Blue","offer_id":44967360594205,"sku":"BAA-2458313","price":110.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ Dark Blue","offer_id":44967360626973,"sku":"BAA-2458302","price":75.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Dark Blue","offer_id":44967360659741,"sku":"BAA-2458312","price":110.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ Green","offer_id":44967360692509,"sku":"BAA-2458304","price":75.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Green","offer_id":44967360725277,"sku":"BAA-2458314","price":110.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ Orange","offer_id":44967360758045,"sku":"BAA-2458306","price":75.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Orange","offer_id":44967360790813,"sku":"BAA-2458316","price":110.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ Red","offer_id":44967360823581,"sku":"BAA-2458307","price":75.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Red","offer_id":44967360856349,"sku":"BAA-2458317","price":110.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ Yellow","offer_id":44967360889117,"sku":"BAA-2458301","price":75.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Yellow","offer_id":44967360921885,"sku":"BAA-2458311","price":110.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-Individual-Color-Filters-1__91240.1597110976.1280.1280.jpg?v=1684341060"},{"product_id":"baader-color-filter-set-6-colors","title":"Baader Color Filter Set - 6 Colors","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSet of 6 essential color filters for lunar and planetary observing\u003c\/li\u003e\n\u003cli\u003ePlaneoptically polished to maintain image sharpness at high magnification\u003c\/li\u003e\n\u003cli\u003eDouble 7-layer Phantom Group anti-reflection coatings\u003c\/li\u003e\n\u003cli\u003eReduces residual reflections to just 0.25% per surface\u003c\/li\u003e\n\u003cli\u003eLargest possible clear aperture eliminates vignetting\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\u003eDownloads\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\u003eBaader Color Filter Set - 6 Colors\u003c\/h2\u003e\n\u003cp\u003eThe Baader Color Filter Set provides 6 essential, planeoptically polished filters for critical lunar and planetary observation. Each filter in the set is treated with a double 7-layer Phantom Group anti-reflection coating that holds residual reflections to just 0.25% per surface, ensuring maximum contrast and light throughput without ghosting.\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\u003eThe 6-Filter Set: A Complete Planetary Contrast Toolkit\u003c\/h3\u003e\n\u003cp\u003eThis set of 6 filters provides the core colors needed to enhance specific features on the Moon and planets. Rather than buying filters individually, this comprehensive kit equips you with the right tool to increase contrast on Jupiter's cloud belts, Martian polar caps, or subtle lunar rilles, allowing you to adapt to changing seeing conditions and targets throughout an observing session.\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\u003ePhantom Group Coatings: 7 Layers for 0.25% Residual Reflection\u003c\/h3\u003e\n\u003cp\u003eUnlike standard filters that can introduce reflections and dim the image, every Baader color filter is coated with a double 7-layer anti-reflection coating. This advanced \"Phantom Group\" coating reduces unwanted reflections to a negligible 0.25%, preventing the ghost images and flare that can obscure low-contrast planetary detail. The result is a clean, high-contrast view that preserves the brightness of the original image.\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\u003ePlaneoptically Polished: Preserving Sharpness at High Magnification\u003c\/h3\u003e\n\u003cp\u003eA filter is worthless if it degrades your telescope's resolution. Baader filters are planeoptically polished to the same standard as high-end optical windows, ensuring they do not introduce aberrations or soften the image, even at the highest magnifications. Cheaper, unpolished \"raw polished\" filters can distort the wavefront and ruin a sharp view, a limitation the Baader set is engineered to prevent.\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\u003eLargest Free Opening: Eliminating Vignetting Across the Field\u003c\/h3\u003e\n\u003cp\u003eBaader engineers their filter cells to provide the largest possible clear aperture on the market. This design choice completely eliminates vignetting (the dimming of the field edge), which can be a problem with other filters, especially when used with wide-field eyepieces. Your view remains evenly illuminated from edge to edge.\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\u003eBaader vs. Generic Filters: A Difference in Optical Integrity\u003c\/h3\u003e\n\u003cp\u003eWhen choosing color filters, the primary difference lies in the quality of the glass and coatings. While generic filters can provide a basic color cast, they often compromise the entire optical train.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Substrate:\u003c\/strong\u003e The Baader set's planeoptically polished glass preserves the sharp wavefront from your telescope. Many standard filters use lower-grade glass that can visibly degrade image quality at high power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoatings:\u003c\/strong\u003e Baader's 7-layer, 0.25% reflection coatings are vastly superior to the single-layer or uncoated surfaces of budget filters, which are prone to ghosting and significant light loss.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVignetting:\u003c\/strong\u003e The maximized clear aperture of the Baader filters ensures they will not darken the edges of your view, a common issue with thick-celled, small-aperture alternatives.\u003c\/li\u003e\n\u003c\/ul\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\"\u003eWhich filter in the Baader Color Filter Set is best for viewing Jupiter's Great Red Spot (GRS)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003elight blue or green filter\u003c\/strong\u003e from the set will typically provide the best contrast enhancement for Jupiter's Great Red Spot and other red-hued features in the cloud belts. These colors help to separate the red and orange tones from the surrounding white and yellow zones.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader Color Filter Set improve views of Mars?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader set is excellent for Martian observation. An \u003cstrong\u003eorange or red filter\u003c\/strong\u003e will dramatically increase the contrast of the dark albedo features (like Syrtis Major) against the bright orange desert. A \u003cstrong\u003eblue or green filter\u003c\/strong\u003e is useful for highlighting the planet's ice-crystal clouds and the white polar caps.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"planeoptically polished\" mean for a Baader filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003ePlaneoptically polished\u003c\/strong\u003e means the filter's glass surfaces are ground and polished to be perfectly flat and parallel, like a high-quality scientific window. This prevents the filter from distorting the light passing through it, preserving the sharpness of your telescope's image, which is especially critical for high-magnification planetary viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy should I choose a 2\" Baader Color Filter Set over a 1.25\" set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou should choose the 2\" set if you primarily use 2\" eyepieces for your lunar and planetary observing. While less common for high-power viewing, using 2\" filters with 2\" eyepieces eliminates the need for adapters and ensures you never encounter vignetting, even with very long focal length, wide-field eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the filters in the Baader Color Filter Set parfocal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBaader filters are manufactured to tight tolerances and are nearly parfocal, meaning they require very little, if any, refocusing when switching between them. However, due to minute differences in the glass, you may need to make a tiny adjustment to the focuser to achieve perfect sharpness after changing filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack filters from the Baader Color Filter Set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the filter cells have threads on both sides, allowing you to stack them. However, stacking color filters is generally not recommended for planetary viewing as it significantly dims the image and can create unnatural color casts. It's usually more effective to use a single filter that is appropriate for the target.\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\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Round Mounted, 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Count\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Quality\u003c\/td\u003e\n\u003ctd\u003ePlaneoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eDouble 7-Layer Phantom Group Anti-Reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResidual Reflection\u003c\/td\u003e\n\u003ctd\u003e0.25% per surface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eLargest free opening to eliminate vignetting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.04 (1.25\" Round Mounted)\u003cbr\u003e0.07 (2\" Round Mounted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eFilter-Set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eColor, Planetary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass, Longpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003emultiple bands (see spectral image)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group, planeoptically polished\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Color_Filters_Product_Information.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Color Filters Product Information\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\" Round Mounted","offer_id":44967361839389,"sku":"BAA-2458300","price":401.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967361872157,"sku":"BAA-2458310","price":605.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Color-Filter-Set-6-Colors-1__26791.1597110981.1280.1280.jpg?v=1684341108"},{"product_id":"baader-moon-skyglow-filter","title":"Baader Moon \u0026 Skyglow Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnhances lunar and planetary contrast with a Neodymium glass substrate\u003c\/li\u003e\n\u003cli\u003eSuppresses skyglow from artificial lighting without aggressive color shifting\u003c\/li\u003e\n\u003cli\u003eFeatures an integrated UV\/IR-cut filter for sharper digital imaging\u003c\/li\u003e\n\u003cli\u003ePlaneoptically polished for aberration-free use anywhere in the optical train\u003c\/li\u003e\n\u003cli\u003eAvailable in both 1.25\" and 2\" standard filter sizes\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\u003eDownloads\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\u003eBaader Moon \u0026amp; Skyglow Filter\u003c\/h2\u003e\n      \u003cp\u003eThe Baader Moon \u0026amp; Skyglow Filter, available in 1.25\" and 2\" round mounted cells, is a multi-bandpass filter that dramatically boosts lunar and planetary contrast by isolating key wavelengths with its neodymium-infused substrate. This single filter also serves as a mild light pollution suppressor and a full UV\/IR-cut filter, making it a uniquely versatile tool for both visual observers and DSLR imagers using either the 1.25\" or 2\" format.\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\u003eNeodymium Glass: Selective Contrast for Planetary Detail\u003c\/h3\u003e\n      \u003cp\u003eBased on a Carl Zeiss formulation, the filter's core is neodymium-doped optical glass. This material selectively notches out specific wavelengths, particularly in the yellow-orange part of the spectrum associated with sodium-vapor streetlights. This has the effect of boosting the relative transmission of reds and blues, making surface details on celestial objects much more distinct.\u003c\/p\u003e\n      \u003cp\u003eVisually, this translates to a more defined Great Red Spot (GRS) on Jupiter, clearer separation of Martian polar caps from the ruddy desert, and enhanced texture in lunar maria and crater walls. Unlike simple color filters, it achieves this contrast gain while maintaining a more natural color balance across the entire field.\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\u003eSkyglow Suppression Without Unnatural Color Shift\u003c\/h3\u003e\n      \u003cp\u003eWhile designed for planetary and lunar work, the filter's ability to block common sources of light pollution makes it an effective tool for deep-sky observing from suburban skies. It darkens the background sky by filtering out the primary emission lines from older street lighting, increasing the visibility of nebulae and galaxies.\u003c\/p\u003e\n      \u003cp\u003eThe key trade-off is its subtlety. It is not a heavy-handed narrowband filter that produces a strong color cast. Instead, it provides a noticeable improvement in signal-to-noise ratio while preserving the natural colors of star fields and galaxies, making it a preferred choice for observers who dislike the artificial green or blue tint of aggressive UHC or CLS filters.\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\u003eIntegrated UV\/IR Cut for Sharper Digital Imaging\u003c\/h3\u003e\n      \u003cp\u003eThe Baader Moon \u0026amp; Skyglow is effectively three filters in one, incorporating a full UV\/IR blocking coating. This is critical for digital astrophotography, as camera sensors are sensitive to ultraviolet and infrared light that is invisible to the human eye and unfocused by most telescopes. This out-of-focus light can cause star bloat, reduce contrast, and wash out fine detail.\u003c\/p\u003e\n      \u003cp\u003eBy blocking these wavelengths, the filter ensures that only the focused, visible-light image reaches the sensor. This results in tighter, sharper stars and a cleaner signal, eliminating the need to stack a separate Luminance (UV\/IR-Cut) filter when imaging from light-polluted areas with a color camera or DSLR.\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\u003ePlaneoptically Polished: Sharpness in 1.25\" or 2\" Optical Trains\u003c\/h3\u003e\n      \u003cp\u003eEach Moon \u0026amp; Skyglow filter is planeoptically polished to an exacting standard, ensuring the glass surfaces are perfectly parallel. This prevents the introduction of optical aberrations like astigmatism, even when the filter is placed far from the focal plane—such as in front of a binoviewer or star diagonal.\u003c\/p\u003e\n      \u003cp\u003eThis manufacturing discipline means you can place the 1.25\" or 2\" filter anywhere in your imaging or visual train without degrading the performance of your primary optics. Cheaper filters with non-parallel surfaces can noticeably soften the image when used in these positions, but the Baader maintains the full sharpness of your telescope system.\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\u003eMoon \u0026amp; Skyglow vs. Traditional LPR Filters: A Broader Approach\u003c\/h3\u003e\n      \u003cp\u003eIt's important to distinguish the Moon \u0026amp; Skyglow filter from typical broadband Light Pollution Reduction (LPR) filters. While both combat skyglow, their design philosophies differ significantly.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eColor Balance:\u003c\/strong\u003e Traditional LPR filters often create a strong green-blue color cast, which can be unnatural for anything other than emission nebulae. The Moon \u0026amp; Skyglow filter is engineered to produce a more neutral, balanced view that enhances color separation rather than shifting it.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePrimary Target:\u003c\/strong\u003e Most LPR filters are optimized for deep-sky objects, specifically nebulae. The Moon \u0026amp; Skyglow is a hybrid, designed first for high-contrast lunar and planetary viewing, with its skyglow reduction serving as a powerful secondary benefit for all object types.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTransmission Curve:\u003c\/strong\u003e The Moon \u0026amp; Skyglow filter uses narrow, selective \"notches\" to block specific pollution lines. Many LPR filters use broader bandpass windows, which can sometimes suppress faint starlight along with the pollution.\u003c\/li\u003e\n      \u003c\/ul\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\"\u003eHow does the Baader Moon \u0026amp; Skyglow filter make Jupiter's Great Red Spot more visible?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe filter's neodymium glass selectively blocks light in the yellow-orange part of the spectrum. This increases the relative contrast between the red wavelengths of the Great Red Spot and the surrounding beige and yellow cloud bands of Jupiter. By suppressing the \"background\" yellow light, the red features become significantly more prominent and easier to see.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader Moon \u0026amp; Skyglow filter a good choice for imaging the Orion Nebula (M42) with a DSLR from the suburbs?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it's an excellent choice for that specific scenario. The filter provides three key benefits for imaging an object like the Orion Nebula (M42) from a light-polluted area:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSkyglow Reduction:\u003c\/strong\u003e It will darken the sky background, increasing the contrast of the nebula's faint outer loops.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eColor Enhancement:\u003c\/strong\u003e It subtly boosts the reds of the hydrogen-alpha regions without completely altering the natural color of the Trapezium stars.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eUV\/IR Cut:\u003c\/strong\u003e It prevents star bloat from unfocused infrared and ultraviolet light, resulting in sharper stars throughout the image, which is a common issue for DSLR cameras without a modified filter.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Moon \u0026amp; Skyglow filter help with modern LED light pollution?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003ePartially. The filter is most effective against older sodium-vapor (yellow) and mercury-vapor (blue-white) streetlights. Modern white LED lighting is broadband, meaning it emits light across the entire visible spectrum. While the Moon \u0026amp; Skyglow filter will still improve contrast and darken the sky slightly, it cannot eliminate the full impact of broadband LED pollution like a dedicated multi-bandpass narrowband filter can.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack the Baader Moon \u0026amp; Skyglow filter with other color filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. Because it provides a general contrast boost across the spectrum, it can be stacked with traditional planetary color filters (like a #21 Orange or #80A Medium Blue) to further isolate specific details. The Moon \u0026amp; Skyglow acts as a foundational contrast booster, while the added color filter provides more targeted analysis of features like Martian dust storms or Jovian cloud belts.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is this filter called \"Moon \u0026amp; Skyglow\" if it also works so well on planets?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe name highlights its two primary functions. It enhances contrast on the Moon's grey surface features just as effectively as it does on colorful planets. The \"Skyglow\" part of the name refers to its light pollution reduction capability, which darkens the background sky during any type of observing, whether lunar, planetary, or deep-sky.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a separate IR-cut filter for imaging if I use the Baader Moon \u0026amp; Skyglow?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. The Baader Moon \u0026amp; Skyglow filter has a full UV\/IR blocking coating built-in. It serves as a \"luminance\" filter in addition to its contrast-enhancing properties, so you do not need to add a separate UV\/IR-cut filter to your imaging train when using 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\u003eAvailable Options\u003c\/td\u003e\n\u003ctd\u003e1.25\" Round Mounted, 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eCCD, Contrast Enhancement, Color Correction, IR-Cut, Light Pollution Reduction, Lunar, Planetary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003emultiple bands (see spectral image)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group, planeoptically polished\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  \u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Filter_Problems_FAQ_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Filter Problems FAQ Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Neodymium_Moon_and_Skyglow_Filter_Product_Information.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Neodymium Moon and Skyglow Filter Product Information\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n  \u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\" Round Mounted","offer_id":44967363707165,"sku":"BAA-2458305A","price":130.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967363739933,"sku":"BAA-2458334A","price":213.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Moon-Skyglowfilter-1-25-inch-1__79976.1597110984.1280.1280.jpg?v=1684341362"},{"product_id":"baader-neutral-density-filter-nd-0-6-0-9-1-8-3-0","title":"Baader Neutral Density Filter - ND 0.6\/0.9\/1.8\/3.0","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFour Neutral Density Options: ND 0.6, ND 0.9, ND 1.8, and ND 3.0\u003c\/li\u003e\n\u003cli\u003eTwo Standard Sizes: 1.25\" and 2\" round mounted cells\u003c\/li\u003e\n\u003cli\u003eCoatings: Baader Planetarium Phantom Group multi-coatings\u003c\/li\u003e\n\u003cli\u003eSubstrate: Fine-optically polished for maximum sharpness\u003c\/li\u003e\n\u003cli\u003eStackable: Threaded on both sides to combine with other filters\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\u003eDownloads\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\u003eBaader Neutral Density Filter - ND 0.6\/0.9\/1.8\/3.0\u003c\/h2\u003e\n      \u003cp\u003eThe Baader Neutral Density Filter, available in 1.25\" and 2\" formats, provides four distinct optical densities from ND 0.6 to ND 3.0 for precise brightness control of bright celestial objects. These filters are fine-optically polished to maintain critical sharpness at high magnification, whether you choose the ND 0.9 for balancing lunar phases or the ND 1.8 for reducing the overwhelming glare from a full Moon.\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\u003ePhantom Group Coatings: Maximizing Contrast on 1.25\" and 2\" Filters\u003c\/h3\u003e\n      \u003cp\u003eEach Baader ND filter is treated with their proprietary Phantom Group multi-coatings. This advanced coating process virtually eliminates ghosting, reflections, and stray light, resulting in a darker background sky and improved visibility of subtle surface details on the Moon and planets. The fine-optical polish of the substrate ensures that adding the filter to your optical train does not introduce any loss of sharpness, even at high power.\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\u003eFour Densities (ND 0.6 to 3.0) for Lunar and Solar Management\u003c\/h3\u003e\n      \u003cp\u003eChoosing the right light reduction is critical for comfortable observing. Baader offers four densities to match your target: the lighter ND 0.6 and ND 0.9 filters are ideal for observing the Moon during its crescent or quarter phases, while the darker ND 1.8 and ND 3.0 filters are necessary to cut the intense glare of the full Moon, preventing temporary blindness and revealing subtle rilles and crater rays.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCritical Solar Warning:\u003c\/strong\u003e These filters are \u003cstrong\u003eNOT\u003c\/strong\u003e primary solar filters and are unsafe for solar viewing on their own. They may only be used for solar observation as an additional filter, placed *after* a dedicated, objective-mounted solar filter (like Baader AstroSolar Film) to further reduce brightness for imaging or visual comfort.\u003c\/li\u003e\n      \u003c\/ul\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\u003e2-Sided Threads for Stacking on 1.25\" and 2\" Filters\u003c\/h3\u003e\n      \u003cp\u003eBaader ND filters are threaded on both sides of the cell, allowing you to stack them with other filters in your collection. You can easily combine an ND filter with a color filter to enhance planetary details—like a #21 Orange filter for Mars—while simultaneously reducing brightness. This dual-thread design makes the Baader ND filter a modular tool for managing contrast and brightness across a wide range of astronomical targets.\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\"\u003eWhich Baader ND filter density should I choose for the Moon?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe best density depends on the lunar phase and your telescope's aperture. For most telescopes, the \u003cstrong\u003eND 0.6\u003c\/strong\u003e or \u003cstrong\u003eND 0.9\u003c\/strong\u003e are excellent starting points for crescent to quarter phases. For a full or near-full Moon, which can be uncomfortably bright, the \u003cstrong\u003eND 1.8\u003c\/strong\u003e is often required to reduce glare and improve contrast on surface features.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader ND 3.0 filter for direct solar viewing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eAbsolutely not.\u003c\/strong\u003e A Baader Neutral Density filter is NOT a standalone solar filter and will not protect your eyes or equipment from harmful solar radiation. It must only be used as a secondary filter in conjunction with a safe, full-aperture solar filter (like Baader AstroSolar Film) that is placed over the front of your telescope.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do the Phantom Group coatings on the Baader ND filter improve my view?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003eBaader Phantom Group multi-coatings\u003c\/strong\u003e are designed to maximize light transmission at desired wavelengths while minimizing reflections. This prevents ghost images and internal scattering, which would otherwise reduce contrast. The result is a cleaner, higher-contrast image with a darker background, making it easier to see faint details on bright objects.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack a Baader ND filter with my color filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. All Baader ND filters are threaded on both the top and bottom of the filter cell. This allows you to screw another filter, such as a color filter for planetary observing, directly into the Baader ND filter. This is useful for enhancing specific features while simultaneously controlling brightness.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Baader ND 0.9 filter perform on Jupiter with a 10\" f\/5 Dobsonian?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA 10\" telescope gathers significant light, which can sometimes make Jupiter appear overly bright, washing out subtle cloud band details. The \u003cstrong\u003eBaader ND 0.9\u003c\/strong\u003e filter is an excellent choice in this scenario. It will gently dim the view, reducing glare and improving your eye's ability to discern low-contrast features like festoons and ovals within Jupiter's zones and belts 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\"\u003eI'm imaging the lunar terminator with a C8 SCT. Will the Baader ND 0.6 filter help?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, the \u003cstrong\u003eBaader ND 0.6\u003c\/strong\u003e filter is very useful for imaging bright lunar regions like the terminator with a C8. It helps prevent overexposure of crater rims and bright highlands by reducing the overall light intensity. This allows you to use longer exposure times to capture detail in the adjacent shadowed areas without blowing out the highlights, resulting in a more balanced and detailed final image.\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\u003eNeutral Density (ND)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" and 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Densities\u003c\/td\u003e\n\u003ctd\u003eND 0.6, ND 0.9, ND 1.8, ND 3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eBaader Planetarium Phantom Group Multi-Coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eFine-Optically Polished Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreading\u003c\/td\u003e\n\u003ctd\u003eThreaded on both sides for stacking\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eLunar, Planetary, Solar (1.25\" Round Mounted \/ ND 0.6, 2\" Round Mounted \/ ND 0.6, 1.25\" Round Mounted \/ ND 0.9, 2\" Round Mounted \/ ND 0.9, 1.25\" Round Mounted \/ ND 1.8, 2\" Round Mounted \/ ND 1.8)\u003cbr\u003eSolar (1.25\" Round Mounted \/ ND 3.0, 2\" Round Mounted \/ ND 3.0)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003efull Spectrum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission\u003c\/td\u003e\n\u003ctd\u003e25% (1.25\" Round Mounted \/ ND 0.6, 2\" Round Mounted \/ ND 0.6)\u003cbr\u003e12.5% (1.25\" Round Mounted \/ ND 0.9, 2\" Round Mounted \/ ND 0.9)\u003cbr\u003e1.5% (1.25\" Round Mounted \/ ND 1.8, 2\" Round Mounted \/ ND 1.8)\u003cbr\u003e0.1% (1.25\" Round Mounted \/ ND 3.0, 2\" Round Mounted \/ ND 3.0)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDamping Factor\u003c\/td\u003e\n\u003ctd\u003e4x (1.25\" Round Mounted \/ ND 0.6, 2\" Round Mounted \/ ND 0.6)\u003cbr\u003e8x (1.25\" Round Mounted \/ ND 0.9, 2\" Round Mounted \/ ND 0.9)\u003cbr\u003e64x (1.25\" Round Mounted \/ ND 1.8, 2\" Round Mounted \/ ND 1.8)\u003cbr\u003e1000x (1.25\" Round Mounted \/ ND 3.0, 2\" Round Mounted \/ ND 3.0)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group, planeoptically polished\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  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\" Round Mounted \/ ND 0.6","offer_id":44967363805469,"sku":"BAA-2458343","price":70.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ ND 0.6","offer_id":44967363838237,"sku":"BAA-2458321","price":118.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ ND 0.9","offer_id":44967363871005,"sku":"BAA-2458344","price":70.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ ND 0.9","offer_id":44967363903773,"sku":"BAA-2458322","price":118.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ ND 1.8","offer_id":44967363936541,"sku":"BAA-2458345","price":70.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ ND 1.8","offer_id":44967363969309,"sku":"BAA-2458331","price":118.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ ND 3.0","offer_id":44967364002077,"sku":"BAA-2458346","price":70.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ ND 3.0","offer_id":44967364034845,"sku":"BAA-2458332","price":118.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-Neutral-Density-Filter-ND-1__33295.1597110986.1280.1280.jpg?v=1684341118"},{"product_id":"baader-visual-oiii-nebula-filter","title":"Baader Visual OIII Nebula Filter","description":"\u003c!-- more --\u003e\u003cp\u003eDelivers the absolute highest contrast views of many diffuse and planetary nebula. For many objects, the Baader O-III reveals a level of intricate detail that rivals the best deep sky photographs. Our favorite filter for the majority of nebula, especially The Veil, Lagoon (M8), Swan (M17), Ring (M57) and Dumbell (M29). With a large scope, you can even view the famous 'Pillars of Creation' in M16 (Eagle).\u003c\/p\u003e\u003cp\u003eThe Baader O-III perfectly isolates the two doubly ionized oxygen lines (496 and 501nm), through a very sharp and optimally narrow bandpass (10 nm wide). Unlike other O-III filters, the Baader O-III completely blocks longer and shorter wavelengths (ever wonder why some O-III filters appear RED?, instead of the correct 500 nm Teal color). The result is the highest contrast achievable in an O-III filter.\u003c\/p\u003e\u003cp\u003eThe O-III benefits from the precision fineoptically polished flat substrate, and advanced DWDM plasma assisted coatings. As a result, the Baader O-III will not degrade image sharpness or impart double images. To prevent deterioration from cleaning or exposure to moisture, some other filters even resort to sandwiching their delicate coatings between two layers of filter glass, resulting in potential blurred or double images. Contrary to myth, nebula filters are often useful at high magnifications, where image quality counts. Baader O-III filters can take high magnifications, and stars retain their pinpoint sharpness, even if the filter is used far ahead of the image plane (ie, for imaging use, or ahead of a star diagonal or binoviewer). Combine with our UV\/IR filter for the ultimate in O-III deep sky imaging.\u003c\/p\u003e\u003cp\u003e\u003cimg alt=\" src=\" https:\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTypical Transmission Curve\u003c\/strong\u003e\u003c\/p\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003ch2\u003e1.25\"\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMANUFACTURER\u003c\/th\u003e\n\u003ctd\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSKU (#)\u003c\/th\u003e\n\u003ctd\u003e2458395\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEAN CODE\u003c\/th\u003e\n\u003ctd\u003e4047825009364\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWEIGHT (KG)\u003c\/th\u003e\n\u003ctd\u003e0.059\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTRANSMISSION RANGE\u003c\/th\u003e\n\u003ctd\u003eO-III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFILTER THICKNESS (WITHOUT CELL)\u003c\/th\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHBW (HALFBANDWIDTH)\u003c\/th\u003e\n\u003ctd\u003e10nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCWL (CENTRAL WAVELENGTH)\u003c\/th\u003e\n\u003ctd\u003e502 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAR-COATING\u003c\/th\u003e\n\u003ctd\u003edielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFILTER SIZE\u003c\/th\u003e\n\u003ctd\u003e1 25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFILTER USAGE\u003c\/th\u003e\n\u003ctd\u003eContrast Enhancement, O-III, Planetary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFILTER MOUNTED\u003c\/th\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTYPE OF FILTER\u003c\/th\u003e\n\u003ctd\u003eNarrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSINGLE OR SET?\u003c\/th\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFILTER SHAPE\u003c\/th\u003e\n\u003ctd\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003e2\"\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMANUFACTURER\u003c\/th\u003e\n\u003ctd\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSKU (#)\u003c\/th\u003e\n\u003ctd\u003e2458396\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEAN CODE\u003c\/th\u003e\n\u003ctd\u003e4047825009357\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWEIGHT (KG)\u003c\/th\u003e\n\u003ctd\u003e0.065\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCOLOUR\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTRANSMISSION RANGE\u003c\/th\u003e\n\u003ctd\u003eO-III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFILTER THICKNESS (WITHOUT CELL)\u003c\/th\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHBW (HALFBANDWIDTH)\u003c\/th\u003e\n\u003ctd\u003e10nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCWL (CENTRAL WAVELENGTH)\u003c\/th\u003e\n\u003ctd\u003e502 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAR-COATING\u003c\/th\u003e\n\u003ctd\u003edielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFILTER SIZE\u003c\/th\u003e\n\u003ctd\u003e2 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFILTER USAGE\u003c\/th\u003e\n\u003ctd\u003eContrast Enhancement, O-III, Planetary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFILTER MOUNTED\u003c\/th\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTYPE OF FILTER\u003c\/th\u003e\n\u003ctd\u003eNarrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSINGLE OR SET?\u003c\/th\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFILTER SHAPE\u003c\/th\u003e\n\u003ctd\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv class=\"moretab\" data-title=\"Downloads \u0026amp; Support\"\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\" Round Mounted","offer_id":44967364133149,"sku":"BAA-2458395","price":153.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967364165917,"sku":"BAA-2458396","price":265.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Visual-OIII-Nebula-Filter-1__58361.1597110989.1280.1280.jpg?v=1684341152"},{"product_id":"baader-polarizing-filter-single","title":"Baader Polarizing Filter - Single","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" Barrel Sizes\u003c\/li\u003e\n\u003cli\u003eEssential for Brightness Control with a Herschel Wedge\u003c\/li\u003e\n\u003cli\u003eEnhances Contrast on Planetary and Lunar Targets\u003c\/li\u003e\n\u003cli\u003eStackable Design for Variable Light Attenuation\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\u003eDownloads\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\u003eBaader Single Polarizing Filter\u003c\/h2\u003e\n\u003cp\u003eAvailable in 1.25\" and 2\" formats, the Baader Single Polarizing Filter is a specialized tool for managing image brightness in critical applications. Its primary function is to fine-tune the dazzling solar image produced by a Baader Herschel Wedge, and it can be paired with a second filter to create a variable attenuator for comfortable lunar and planetary observation.\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\u003eSolar Observation: The Primary Role with a Baader Herschel Wedge\u003c\/h3\u003e\n\u003cp\u003eFor white-light solar observing, a single Baader Polarizing Filter is the perfect companion to a Herschel Safety Wedge. The wedge itself acts as a linear polarizer, meaning the light exiting it is already polarized. By simply rotating this single filter in your eyepiece barrel or diagonal, you can smoothly adjust the final image brightness to your preference without altering color or contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCrucial Safety Warning:\u003c\/strong\u003e A polarizing filter must \u003cstrong\u003enever\u003c\/strong\u003e be used for solar observation on its own. It must always be placed behind a primary solar filter, such as a Baader AstroSolar front-mounted film filter or a Herschel Safety Wedge. Using an eyepiece filter alone will result in immediate and permanent eye damage.\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\u003eLunar \u0026amp; Planetary Viewing: Variable Attenuation and Contrast\u003c\/h3\u003e\n\u003cp\u003eOn its own, a single polarizing filter can subtly increase contrast when viewing planets, helping to define faint cloud belts on Jupiter or surface details on Mars. Its real strength for night observing comes from using two filters together. By threading a second Baader Single Polarizing Filter into the first, you create a variable neutral density filter.\u003c\/p\u003e\n\u003cp\u003eAs you rotate one filter relative to the other, you can dial in the exact amount of brightness reduction needed to view the full Moon without glare or to tease out faint details near the terminator. This provides a level of control that fixed neutral density filters cannot match.\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 Considerations: Flexibility vs. Image Purity\u003c\/h3\u003e\n\u003cp\u003eThe Baader Polarizing Filter is designed for maximum flexibility. However, it's important to understand the optical trade-offs. For variable brightness control, you can stack two single filters or use Baader's dedicated Double Polarizing Filter, which integrates both rotating elements into a single, convenient housing.\u003c\/p\u003e\n\u003cp\u003eIf your goal is the absolute highest image fidelity with minimal light scatter, a fixed-transmission Neutral Density (ND) filter is optically superior. ND filters introduce fewer glass-to-air surfaces into the light path, which maximizes contrast and image purity. For observers who prioritize convenience and adjustability, the polarizing filter system is ideal; for those seeking ultimate image quality at a fixed brightness, an ND filter is the better choice.\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\"\u003eWhy do I only need one Baader Polarizing Filter for my Herschel Wedge?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader Herschel Safety Wedge internally polarizes the sunlight it transmits. Because the light is already polarized, a single polarizing filter threaded onto your eyepiece is sufficient to act as a dimmer switch—simply rotating it will adjust the final image brightness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I adjust brightness on the Moon with a Baader Single Polarizing Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo adjust brightness on the Moon or planets, you need \u003cstrong\u003etwo\u003c\/strong\u003e single polarizing filters. Thread one onto your eyepiece, and then thread the second one into the first. By rotating the eyepiece, you change the alignment of the filters, allowing you to vary the light transmission from maximum to nearly fully blocked.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader Polarizing Filter for solar viewing by itself?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eAbsolutely not.\u003c\/strong\u003e A polarizing filter alone provides nowhere near the protection required for safe solar viewing. It must only be used downstream from a primary, objective-side solar filter like Baader AstroSolar film or a Herschel Safety Wedge. Using it alone will cause instant and irreversible blindness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a Baader Polarizing Filter better than a Neutral Density (ND) filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt depends on your goal. A polarizing filter system offers \u003cstrong\u003eflexibility\u003c\/strong\u003e to adjust brightness, which is excellent for changing conditions or targets. For the absolute \u003cstrong\u003ehighest image quality\u003c\/strong\u003e, a fixed Neutral Density filter is superior because it has fewer optical surfaces, resulting in less scatter and higher contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between buying two Baader single filters and the Baader Double Polarizing Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFunctionally, they achieve the same result. Buying two single filters gives you more modularity—you can use just one for planetary contrast or with a Herschel wedge. The dedicated Baader Double Polarizing Filter integrates both filters into a single, rotating cell, which is often more convenient to use as a dedicated lunar or planetary filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Polarizing Filter thread into my standard eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Baader Polarizing Filters are available in 1.25\" and 2\" sizes and feature standard filter threads (M28.5x0.6 for 1.25\" and M48x0.75 for 2\") that are compatible with the vast majority of astronomical eyepieces and accessories.\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\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Round Mounted, 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eDouble mounted (LPFC 6mm) - total height 15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eLunar, Planetary, Solar, Specialty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eNeutral Density, Polarizing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003efull Spectrum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group, planeoptically polished\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Cleaning_and_Maintenance_of_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Cleaning and Maintenance of Optics Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\" Round Mounted","offer_id":44967364198685,"sku":"BAA-2408343","price":62.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967364231453,"sku":"BAA-2408342","price":105.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Polarizing-Filter-Single-1__55320.1597110991.1280.1280.jpg?v=1684341161"},{"product_id":"baader-polarizing-filter-double","title":"Baader Polarizing Filter - Double","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eContinuously variable brightness adjustment\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" barrel sizes\u003c\/li\u003e\n\u003cli\u003eReduces glare on the Moon and bright planets\u003c\/li\u003e\n\u003cli\u003eSingle-unit, double-filter design for high contrast\u003c\/li\u003e\n\u003cli\u003eEssential for tuning brightness in solar viewing (with a proper solar filter)\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\u003eBaader Polarizing Filter - Double\u003c\/h2\u003e\n      \u003cp\u003eThe Baader Double Polarizing Filter, available in 1.25\" and 2\" formats, delivers continuously variable brightness control for high-contrast views of the Moon and planets. It is also an essential tool for fine-tuning solar image brightness when used downstream from a certified front-mounted filter like Baader's AstroSolar Safety Film ND 5.0.\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\u003eVariable Brightness Control for Lunar and Planetary Detail\u003c\/h3\u003e\n      \u003cp\u003eBy simply rotating one part of the filter cell, you can adjust the image brightness to the ideal level for your target and magnification. This allows you to dial down the overwhelming glare of a full Moon to reveal subtle crater rays and surface textures, or to dim bright planets like Venus and Jupiter to better resolve cloud bands and atmospheric details.\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\u003eA Unified Double-Filter System for High-Contrast Alignment\u003c\/h3\u003e\n      \u003cp\u003eUnlike stacking two separate filters, the Baader Double Polarizing Filter is constructed as a single, inseparable unit. This design ensures the two polarizing elements remain perfectly parallel and aligned, which is critical for preventing internal reflections and preserving image contrast, especially at high magnifications.\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\u003ePolarizing vs. Neutral Density Filters: A Question of Flexibility\u003c\/h3\u003e\n      \u003cp\u003eWhile a fixed neutral density (ND) filter offers the absolute highest image quality due to having fewer glass surfaces, a polarizing filter provides unmatched flexibility. If your observing targets vary from the bright Moon to dimmer planets, the ability to precisely control the level of light reduction makes the Baader Polarizing Filter an indispensable tool in your accessory case.\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\"\u003eHow do I adjust the brightness with the Baader Polarizing Filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Baader Double Polarizing Filter consists of a two-part cell. While the filter is threaded into your eyepiece or diagonal, you can smoothly rotate the outer part of the housing. This rotation changes the alignment of the two polarizing elements, allowing you to continuously vary the light transmission from maximum to minimum brightness.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader Polarizing Filter for solar observing by itself?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cb\u003eAbsolutely not.\u003c\/b\u003e A polarizing filter provides no protection from harmful infrared or ultraviolet radiation. It must \u003cb\u003eonly\u003c\/b\u003e be used for solar observing when placed \u003cb\u003eafter\u003c\/b\u003e a primary, objective-mounted solar filter like Baader AstroSolar Safety Film or a Herschel Wedge. Using an eyepiece filter like this for solar viewing without a primary front filter will cause permanent eye damage and destroy the filter.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the advantage of this Baader double filter over stacking two separate polarizing filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Baader Double Polarizing Filter is a single, factory-aligned unit. This prevents potential image degradation from misaligned or non-parallel surfaces that can occur when stacking two separate filters, ensuring maximum contrast and sharpness.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I choose the Baader Polarizing Filter over an ND filter for viewing Jupiter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA polarizing filter is ideal for Jupiter because you can fine-tune the brightness to changing conditions or magnifications. An ND filter has a fixed transmission, which might be too dark at high power or not dark enough at low power. The Baader Polarizing Filter allows you to dial in the perfect contrast to see faint details in Jupiter's cloud belts regardless of the eyepiece you use.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Polarizing Filter help me see more detail on the full Moon with my 8\" SCT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, significantly. An 8\" SCT gathers a great deal of light, making the full Moon uncomfortably bright and washing out subtle detail. The Baader Polarizing Filter allows you to reduce the glare to a comfortable level, dramatically increasing contrast and making it easier to see features like crater ejecta blankets and rilles.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy can't the two filters in the Baader Double Polarizing Filter be separated?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe filters are designed as an integrated unit to maintain perfect optical alignment. This is key to delivering high-contrast views. If they were separable, it would be easy to introduce tilt or spacing errors that could degrade the image, which this unified design prevents.\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\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" and 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01 (1.25\" Round Mounted)\u003cbr\u003e0.03 (2\" Round Mounted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eDouble mounted (LPFC 6mm) - total height 15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eLunar, Planetary, Solar, Specialty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eNeutral Density, Polarizing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecial Features\u003c\/td\u003e\n\u003ctd\u003edouble polarizing filter for stepless brightness adjustment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003efull Spectrum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group, planeoptically polished\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  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\" Round Mounted","offer_id":44967364428061,"sku":"BAA-2408340","price":117.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967364460829,"sku":"BAA-2408344","price":169.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Polarizing-Filter-Double-1__41097.1597110992.1280.1280.jpg?v=1684341169"},{"product_id":"baader-u-venus-filter-350nm","title":"Baader U-Venus Filter - 350nm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e350nm Central Wavelength\u003c\/li\u003e\n\u003cli\u003e60nm Bandwidth (320-380nm)\u003c\/li\u003e\n\u003cli\u003e~80% Peak Transmission\u003c\/li\u003e\n\u003cli\u003eBlocks Visible and IR light from 200nm to 1120nm\u003c\/li\u003e\n\u003cli\u003eDielectric Multi-Coated Schott Glass\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\u003eDownloads\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\u003eBaader U-Venus Filter - 350nm\u003c\/h2\u003e\n\u003cp\u003eThe Baader U-Venus Filter isolates a specific 60nm bandpass centered on 350nm, designed to reveal the high-contrast cloud structures of the Venusian atmosphere otherwise invisible to the eye. It achieves approximately 80% peak transmission within its 320-380nm window while completely blocking the entire visual and infrared spectrum from 200nm to 1120nm, ensuring only pure ultraviolet data reaches your sensor.\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\u003eIsolating Venus's Atmosphere: The 350nm UV Window\u003c\/h3\u003e\n\u003cp\u003eIn visible light, Venus presents as a brilliant, featureless white disc due to its dense, highly reflective cloud deck. However, at the deep ultraviolet wavelength of 350nm, atmospheric chemicals like sulfur dioxide absorb sunlight, creating dark, dynamic patterns. The Baader U-Venus filter precisely targets this 350nm window, transforming the planet from a blank canvas into a world of swirling clouds and complex weather systems for your camera to capture.\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\u003eAdvanced Coatings for 80% Transmission and Deep Blocking\u003c\/h3\u003e\n\u003cp\u003eThis filter's effectiveness comes from its advanced dielectric multi-coatings, applied to an optically polished Schott glass substrate. These coatings deliver a high peak transmission of approximately 80% within the narrow 60nm passband. Critically, the filter provides complete blocking of all other wavelengths from 200nm up to 1120nm, eliminating contamination from visible and near-infrared light that would otherwise overwhelm the faint UV signal and wash out delicate cloud details.\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\u003eImaging Venus with a 5\" Telescope and UV-Sensitive Camera\u003c\/h3\u003e\n\u003cp\u003eImaging in the deep UV is a demanding technique that requires a specific equipment setup. The Baader U-Venus filter is not a visual accessory; it is designed for use with a monochrome astronomy camera that has high sensitivity in the ultraviolet spectrum. Due to the dimness of the UV signal, a telescope with a minimum aperture of 5 inches is required, though an 8-inch or larger instrument is strongly recommended to achieve a bright enough image for the short exposures used in lucky imaging.\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\"\u003eWhy is the Baader U-Venus filter centered at 350nm for imaging Venus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eVenus's surface is hidden by a uniform, highly reflective cloud deck in visible light. At \u003cstrong\u003e350nm in the deep ultraviolet\u003c\/strong\u003e, specific chemicals in the atmosphere absorb sunlight, creating dark, high-contrast patterns. This allows imagers to capture the dynamic cloud structures and weather systems that are otherwise completely invisible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of camera do I need for the Baader U-Venus 350nm filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou must use a \u003cstrong\u003emonochrome imaging camera\u003c\/strong\u003e with high sensitivity in the ultraviolet spectrum. Standard color cameras have internal filters that block UV light, and many older mono cameras have low UV quantum efficiency. Modern mono CMOS sensors are generally the best choice for this application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I see Venus's clouds visually with the Baader U-Venus filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e The human eye is not sensitive to the 320-380nm wavelengths passed by this filter. It is designed exclusively for photographic and electronic imaging with UV-sensitive cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader U-Venus 350nm filter work with my 4\" refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you might record a faint signal, it is \u003cstrong\u003enot recommended\u003c\/strong\u003e. Successful UV imaging requires significant light-gathering power. Baader recommends a minimum aperture of 5 inches, with 8 inches or more being ideal to achieve a bright enough image for lucky imaging techniques and to overcome the dimness of the UV signal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the deep blocking from 200nm to 1120nm improve images with the Baader U-Venus filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy completely blocking all visible and near-infrared light, the filter ensures that only the desired 350nm UV signal reaches the sensor. This prevents longer wavelengths from \"leaking\" through and washing out the faint UV cloud details, which dramatically \u003cstrong\u003eincreases contrast\u003c\/strong\u003e and reveals subtle atmospheric features.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader U-Venus 350nm filter for deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is not its intended purpose. While some specialized research involves UV imaging of reflection nebulae or specific star types, the vast majority of deep-sky objects are extremely dim in the UV. This filter is highly optimized for imaging the solar system's brightest inner planet, \u003cstrong\u003eVenus\u003c\/strong\u003e.\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\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" \u0026amp; 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral Wavelength (CWL)\u003c\/td\u003e\n\u003ctd\u003e350nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth (FWHM)\u003c\/td\u003e\n\u003ctd\u003e60nm (320nm - 380nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd\u003e~80%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e200nm - 1120nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eOptically Polished Schott Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eDielectric Multi-Coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eSpecialty, UV-Pass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eNarrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003eUV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003edielectrically coated, planeoptically polished\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\"\u003eBaader U-Venus 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\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\" Round Mounted","offer_id":44967365476637,"sku":"BAA-2458292","price":348.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967365509405,"sku":"BAA-2458291","price":487.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-U-Venus-Filter-350nm-1__53498.1597110999.1280.1280.jpg?v=1684341185"},{"product_id":"zwo-ch4-methane-filter-20nm-1-25","title":"ZWO CH4 Methane Filter - 20nm 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReveals high-altitude detail on Jupiter and Saturn\u003c\/li\u003e\n\u003cli\u003e20nm bandpass centered on the methane absorption line\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" (31.75mm) threaded cell\u003c\/li\u003e\n\u003cli\u003eReduces effects of atmospheric seeing\u003c\/li\u003e\n\u003cli\u003e2-Year ZWO Warranty\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\u003eDownloads\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\u003eZWO 20nm CH4 Methane Band Filter - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe ZWO CH4 Methane Filter isolates a specific 20nm bandpass deep in the near-infrared spectrum, targeting the strong methane absorption lines in the atmospheres of gas giants. Housed in a standard 1.25\" (31.75mm) threaded cell, this filter is purpose-built to reveal high-altitude clouds and storm systems on Jupiter and Saturn that are completely invisible in visible light.\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\u003eIsolating Planetary Detail with a 20nm Bandpass\u003c\/h3\u003e\n\u003cp\u003eThe 20nm FWHM (Full Width at Half Maximum) is precisely tuned to the methane (CH4) absorption band. When you image Jupiter, regions rich in methane absorb this wavelength of light and appear dark, while high-altitude features like the Great Red Spot or bright equatorial zones reflect this light strongly, creating dramatic contrast. This allows you to resolve atmospheric stratification and storm structures that are otherwise lost against the planet's brighter, lower-level cloud decks.\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\u003eSeeing-Resistant Imaging with a 1.25\" Filter\u003c\/h3\u003e\n\u003cp\u003eBecause this filter operates in the near-infrared, it leverages a key principle of atmospheric optics: longer wavelengths of light are less susceptible to distortion from air turbulence (\"seeing\"). On nights of average or poor seeing, the ZWO CH4 filter can deliver a steadier, sharper image than a standard luminance or color filter. This stability is critical for capturing fine planetary detail, making this 1.25\" filter an essential tool for dedicated planetary imagers.\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\u003eCompatibility and Use with Monochrome Cameras\u003c\/h3\u003e\n\u003cp\u003eThis is a specialized filter designed for monochrome cameras that have good sensitivity in the near-infrared. While it can be used with some IR-sensitive color cameras, the best results are achieved with a mono sensor where you can optimize exposure for this specific wavelength. The standard 1.25\" threaded cell ensures it fits any standard filter wheel, filter drawer, or 1.25\" nosepiece, making it a seamless addition to your existing imaging train.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Threads:\u003c\/strong\u003e The 1.25\" cell is threaded to screw directly into standard astronomical accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMono Sensor Optimized:\u003c\/strong\u003e Achieves maximum contrast and detail when paired with a sensitive monochrome planetary camera.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtective Case:\u003c\/strong\u003e Includes a durable plastic case to keep the filter safe and clean when not in use.\u003c\/li\u003e\n\u003c\/ul\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\"\u003eHow will the ZWO CH4 filter change my images of Jupiter's Great Red Spot?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Great Red Spot (GRS) is a high-altitude storm. With the \u003cstrong\u003eZWO CH4 filter\u003c\/strong\u003e, the GRS will appear exceptionally bright against the surrounding, darker methane-rich atmospheric belts. This dramatically increases its contrast and visibility, allowing you to capture its structure even when it appears washed out in visible-light images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat camera do I need to use the ZWO 20nm CH4 filter with my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need an imaging camera with good sensitivity in the near-infrared (around 890nm, where methane absorbs). \u003cstrong\u003eMonochrome planetary cameras\u003c\/strong\u003e are the ideal choice as they typically have higher IR sensitivity than one-shot color cameras. Standard DSLRs are generally not sensitive enough at this wavelength without modification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO CH4 filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is designed for imaging only. The human eye is not sensitive to the near-infrared wavelengths that the ZWO CH4 filter transmits, so you would not be able to see anything through it visually.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ZWO CH4 filter help with bad seeing conditions?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter passes light in the near-infrared part of the spectrum. These longer wavelengths are less distorted by turbulence in Earth's atmosphere (\"seeing\") compared to shorter, visible-light wavelengths. The result is a more stable image at the sensor, which often translates to sharper final images on nights with unsteady air.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 1.25\" ZWO CH4 filter fit my existing filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The ZWO CH4 filter is housed in a standard \u003cstrong\u003e1.25\" (31.75mm) threaded cell\u003c\/strong\u003e. It will screw into any filter wheel, filter drawer, or accessory designed to accept standard 1.25\" astronomical filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO CH4 filter useful for planets other than Jupiter and Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it is most effective on Jupiter and Saturn due to their prominent methane atmospheres, it can also be used to study the atmospheres of Uranus and Neptune. However, these ice giants are much dimmer and smaller, requiring larger telescopes and longer exposures to achieve good results.\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\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-CH4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eCH4 (Methane) Band\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass (FWHM)\u003c\/td\u003e\n\u003ctd\u003e20nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e31.75mm (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat\u003c\/td\u003e\n\u003ctd\u003eThreaded Round Cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended Use\u003c\/td\u003e\n\u003ctd\u003ePlanetary Imaging\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\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\"\u003eZWO CH4 20nm Methane Filter in 1.25\" Cell\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 Filter 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\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload ZWO Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967386022173,"sku":"ZWO-CH4","price":139.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-20nm-CH4-Methane-Filter-1-25-inch-1__16094.1596910046.1280.1280.jpg?v=1684341754"},{"product_id":"lumicon-neutral-density-filter","title":"Lumicon Neutral Density Filter","description":"\u003c!-- more --\u003e\u003ch2\u003eND13\u003c\/h2\u003e\u003cp\u003eLumicon Neutral Density 13 Filter will tone down the glare from the full Moon and allow more planetary detail than ever! Lumicon ND13 transmits 13% of all incident light, while blocking 87%. For lunar observing with 8\" (200mm) and larger telescopes.\u003c\/p\u003e\u003cp\u003eLumicon Neutral Density Filters are made from high quality optical glass and allow for maximum contrast on viewing planetary and lunar detail. Individually precision ground, highly polished with maximum light transmission coatings on both sides.\u003c\/p\u003e\u003ch2\u003eND25\u003c\/h2\u003e\u003cp\u003eLumicon Neutral Density 25 Filter can boost contrast to pull out more details on the over bright full or gibbous Moon and split those faint double stars! Lumicon ND25 transmits 25% of all incident light, while blocking 75%. For lunar and planetary observing with 5\" (125mm) and larger telescopes.\u003c\/p\u003e\u003cp\u003eLumicon Neutral Density Filters are made from renowned Schott and Hoya optical glass and allow for maximum contrast on viewing planetary and lunar detail. Individually precision ground, highly polished with maximum light transmission coatings on both sides.\u003c\/p\u003e\u003ch2\u003eND50\u003c\/h2\u003e\u003cp\u003eLumicon Neutral Density 50 Filter will help reveal subtle details of the solar system! Lumicon ND50 transmits 50% of all incident light, while blocking 50%.  Perfect for lunar and planetary observing, and splitting double stars.\u003c\/p\u003e\u003cp\u003eLumicon Neutral Density Filters are made from high quality optical glass and allow for maximum contrast and detail. Individually precision ground, highly polished with maximum light transmission coatings on both sides.\u003c\/p\u003e","brand":"Lumicon","offers":[{"title":"1.25\" \/ 13","offer_id":44967494484253,"sku":"LUM-LF1080","price":82.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" \/ 25","offer_id":44967494517021,"sku":"LUM-LF1085","price":82.0,"currency_code":"CAD","in_stock":false},{"title":"1.25\" \/ 50","offer_id":44967494549789,"sku":"LUM-LF1090","price":82.0,"currency_code":"CAD","in_stock":false},{"title":"2\" \/ 13","offer_id":44967494582557,"sku":"LUM-LF2080","price":85.0,"currency_code":"CAD","in_stock":false},{"title":"2\" \/ 25","offer_id":44967494615325,"sku":"LUM-LF2085","price":85.0,"currency_code":"CAD","in_stock":false},{"title":"2\" \/ 50","offer_id":44967494648093,"sku":"LUM-LF2090","price":85.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lumicon-Neutral-Density-Filter-ND13-1-25-inch__27867.1597638221.1280.1280.jpg?v=1684342951"},{"product_id":"lunt-polarizing-filter","title":"Lunt Polarizing Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eVariable brightness control for solar viewing\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" barrel sizes\u003c\/li\u003e\n\u003cli\u003eThreads directly onto standard eyepieces\u003c\/li\u003e\n\u003cli\u003eEngineered for use with Lunt White Light Wedges\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\u003eLunt Polarizing Filter\u003c\/h2\u003e\n\u003cp\u003eThe Lunt Polarizing Filter provides essential, continuously variable brightness control for solar observation, offered in both 1.25\" and 2\" formats to match your equipment. It is the recommended accessory for any Lunt White Light Wedge, allowing you to fine-tune the Sun's intense image to a perfectly comfortable level for detailed visual work.\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\u003eVariable Brightness Control for 1.25\" and 2\" Solar Setups\u003c\/h3\u003e\n\u003cp\u003eWhen observing the Sun through a white light wedge, the resulting image is safe but intensely bright. The Lunt Polarizing Filter screws directly onto the barrel of your 1.25\" or 2\" eyepiece to manage this brightness. By simply rotating the filter's housing, you can adjust the image from bright to dim, tailoring the view to your personal preference and revealing subtle details in sunspots and granulation that might otherwise be washed out by glare.\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\"\u003eHow do I use the Lunt Polarizing Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt Polarizing Filter is simple to use. First, choose the filter size (\u003cstrong\u003e1.25\" or 2\"\u003c\/strong\u003e) that matches your eyepiece barrel. Screw the filter onto the bottom of the eyepiece, then insert the eyepiece into your Lunt White Light Wedge. To adjust image brightness, simply rotate the eyepiece within the diagonal; the filter assembly will turn, changing the polarization angle and dimming or brightening the view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt Polarizing Filter by itself for solar viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eAbsolutely not.\u003c\/strong\u003e The Lunt Polarizing Filter is an image-dimming accessory, not a primary solar safety filter. It does not block the harmful infrared (IR) or ultraviolet (UV) radiation from the Sun. It \u003cstrong\u003emust\u003c\/strong\u003e be used in conjunction with a primary solar filter like a Lunt White Light Wedge to observe the Sun safely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich size Lunt Polarizing Filter do I need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou should choose the Lunt Polarizing Filter that matches the barrel size of the eyepieces you intend to use with your Lunt White Light Wedge. If your wedge is a 2\" model but you use 1.25\" eyepieces with an adapter, you will need the 1.25\" filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Lunt Polarizing Filter help when observing sunspots with a White Light Wedge?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eObserving sunspots requires managing the extreme contrast between the dark umbra and the bright surrounding photosphere. The Lunt Polarizing Filter allows you to reduce the overall image brightness, which lowers eye fatigue and makes it easier to discern fine details within the sunspot's penumbra and the granular texture of the solar surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Lunt Polarizing Filter help reduce glare when observing the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While designed for solar use with a wedge, a variable polarizing filter is also highly effective for lunar observation, especially around the full Moon phase when the glare can be overwhelming. The Lunt Polarizing Filter allows you to dial down the Moon's brightness to a comfortable level, improving contrast on subtle features like crater rays and rilles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Lunt Polarizing Filter impart any color to the image?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt Polarizing Filter is designed to be color-neutral. It reduces the brightness of all wavelengths of light evenly, ensuring that the white-light view of the Sun remains true to color without any noticeable tint.\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\u003eSKU\u003c\/td\u003e\n\u003ctd\u003ePF1.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\", 2\"\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"1.25\"","offer_id":44967534756125,"sku":"LSS-PF-1.25","price":36.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":44967534788893,"sku":"LSS-PF-2","price":45.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-Polarizing-Filter__02772.1598228937.1280.1280.jpg?v=1684343613"},{"product_id":"apm-nd-3-0-filter-1-25","title":"APM ND 3.0 Filter - 1.25\"","description":"\u003c!-- more --\u003e\u003cb\u003eGrey Filter ND 3,0 (1000x) 0,1%  1,25''\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications\u003cbr\u003e\u003cbr\u003e\u003c\/b\u003eThis filter will be used in a Herschel Wedge, to reduce the transmitted light to a usable amount. Additional you need a second grey filter or polar filter or Solar Continuum filter.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAdaption\u003cbr\u003e\u003cbr\u003e\u003c\/b\u003eThe filters are simply screwed into the 1.25\" filter thread of the eyepiece or camera adaption. The filter is also available in 2\".\u003cbr\u003e\u003cbr\u003e\u003cb\u003eTransmission\u003cbr\u003e\u003cbr\u003e\u003c\/b\u003eThe smaller the percentage of light transmission, the stronger the filter is. For example a 0,1% filter will allow 1\/1000 of the light to pass through, while the rest will be blocked.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003e\u003cu\u003eDelivery contains:\u003c\/u\u003e\u003cbr\u003e\u003c\/b\u003e\u003cul\u003e\n\u003cli\u003eGrey Filter ND3.0 1.25\"\u003c\/li\u003e\n\u003cli\u003ePlastic Box\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eHousing material:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eAluminium\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eType of filter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eGrey Filter ND3.0\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFilterthread:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1.25\" \/ 28.5 mm Thread both sides\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eDensity:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eND 3.0\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnectingthread:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eM 28.5 mm both sides\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967663927581,"sku":"APM-ND3.0-125","price":29.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-ND-3-0-Filter-1-25-inch-1__99441.1600124038.1280.1280.jpg?v=1684345451"},{"product_id":"optolong-uhc-filter","title":"Optolong UHC Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces skyglow from artificial and natural light pollution\u003c\/li\u003e\n\u003cli\u003eBlocks \u0026gt;99% of mercury vapor and sodium vapor light\u003c\/li\u003e\n\u003cli\u003ePasses key nebula emission lines including H-Alpha, H-Beta, and OIII\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront RMS of ¼ λ\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" mounted sizes, plus DSLR clip-in formats\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\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\u003eOptolong UHC Filter\u003c\/h2\u003e\n\u003cp\u003eThe Optolong UHC (Ultra High Contrast) Filter is engineered to reclaim night sky views from light-polluted areas, delivering \u0026gt;99% blocking of artificial light sources across a 300-700nm range. By isolating critical nebula emission lines with a precision ¼ λ transmitted wavefront, it dramatically increases the contrast between your target and a brightened sky background. The entire optical system maintains 30s parallelism, ensuring the enhanced view is not distorted.\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\u003eUHC Suppression: \u0026gt;99% Light Pollution Blocking at OD3\u003c\/h3\u003e\n\u003cp\u003eThe UHC filter aggressively targets the most common sources of urban skyglow. It achieves an optical density of OD3, blocking more than 99% of light from mercury vapor lamps, high and low-pressure sodium vapor lights, and the natural skyglow caused by neutral oxygen emission. This selective blocking darkens the sky background significantly, making faint nebula structures visible where they would otherwise be 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\u003eTargeted Transmission: High Contrast on OIII, H-Beta, and H-Alpha Nebulae\u003c\/h3\u003e\n\u003cp\u003eWhile blocking unwanted light, the Optolong UHC filter maintains high transmission for the most important deep-sky wavelengths. It passes the light from emission nebulae at OIII (496nm, 500nm), H-Beta (486nm), and H-Alpha (656nm). This makes it exceptionally effective on targets like the Orion Nebula (M42) and the Lagoon Nebula (M8), revealing intricate detail and structure by separating the nebula's light from the washed-out sky.\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 Precision: ¼ λ Wavefront and 60\/40 Surface Quality\u003c\/h3\u003e\n\u003cp\u003eA filter is only as good as the image it passes. The Optolong UHC is built on an optical glass substrate polished to a surface quality of 60\/40 and a transmitted wavefront of ¼ λ or better. Ion-assisted deposition coatings ensure durability and resistance to scratching, while a 30s parallelism guarantees that you are not introducing optical errors into your imaging or visual train. This preserves the sharpness and resolution of your telescope.\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\u003eOptolong UHC vs. CLS: Choosing the Right Filter for Your Sky\u003c\/h3\u003e\n\u003cp\u003eThe Optolong UHC has a narrower bandpass compared to a City Light Suppression (CLS) filter, giving it higher contrast. This makes the UHC a better choice for observers in more heavily light-polluted urban and suburban environments. A CLS filter provides a more natural color balance and works well in darker locations, while the UHC excels at digging faint emission nebulae out of the most challenging skyglow.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUHC Filter:\u003c\/strong\u003e Best for severe light pollution, maximizing contrast on emission nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLS Filter:\u003c\/strong\u003e Better for mild light pollution or dark sites, offering a broader passband and more natural star colors.\u003c\/li\u003e\n\u003c\/ul\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 is the main difference between the Optolong UHC filter and a CLS filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary difference is the width of the passband. The \u003cstrong\u003eOptolong UHC (Ultra High Contrast) filter\u003c\/strong\u003e has a narrower passband, providing more aggressive light pollution rejection and higher contrast on emission nebulae. A CLS (City Light Suppression) filter has a broader passband, resulting in more natural star colors but less intense contrast, making it better suited for moderately light-polluted skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Optolong UHC filter improve my view of the Orion Nebula (M42) from a city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFrom a city, the Orion Nebula (M42) often appears as a small, bright core with its fainter outer structures washed out by skyglow. The Optolong UHC filter blocks this skyglow while passing the nebula's own H-Alpha, H-Beta, and OIII light. This darkens the background sky, dramatically increasing contrast and allowing you to see the faint, extended wings and intricate dust lanes of the nebula that were previously invisible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Optolong UHC filter suitable for astrophotography with a color camera or DSLR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Optolong UHC filter is designed for both visual use and astrophotography with color cameras, including unmodified DSLRs and dedicated one-shot-color astronomy cameras. Its substantial red passband allows it to capture critical H-Alpha data, which is often weak in other light pollution filters, leading to more balanced and detailed nebula images from the city.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Optolong UHC filter make galaxies and star clusters brighter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Optolong UHC filter works by selectively blocking light, which means it will dim all objects to some degree. It is designed for \u003cstrong\u003eemission nebulae\u003c\/strong\u003e, which emit light at specific wavelengths the filter passes. Broadband targets like \u003cstrong\u003egalaxies, reflection nebulae, and star clusters\u003c\/strong\u003e emit light across the entire spectrum. The filter will block much of their light, making them appear dimmer and often harder to see. For these objects, it's best to observe from a dark site without a filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong UHC filter for visual observing with my 8\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. An 8\" Dobsonian is an excellent instrument for visual deep-sky observing, and the Optolong UHC filter is a perfect accessory for it, especially from suburban skies. It will significantly enhance views of emission nebulae like the Swan Nebula (M17) and the Veil Nebula (NGC 6960), making them stand out clearly against a darkened sky background.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Optolong UHC filter not recommended for solar observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eWARNING: NEVER use this filter for solar observation.\u003c\/strong\u003e The Optolong UHC filter is designed to block specific, narrow wavelengths of light from artificial sources at night. It does not block the intense, full-spectrum visible and invisible (infrared, ultraviolet) radiation from the Sun. Looking at the Sun with this filter, or any filter not explicitly designed for solar viewing, will cause immediate and permanent blindness.\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\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eOptical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e300-700nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003eOD3, light pollution line blocking \u0026gt;99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40 (MIL-O-13830A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003e¼ λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Formats\u003c\/td\u003e\n\u003ctd\u003e1.25\" Mounted, 2\" Mounted, Clip for Canon EOS APS-C, Clip for Canon EOS Full Frame, Clip for Nikon Full Frame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":44967781695773,"sku":"OPT-10101","price":77.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":44967781728541,"sku":"OPT-10102","price":119.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Canon EOS APS-C","offer_id":44967781761309,"sku":"OPT-UHC-EOS-APSC","price":133.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Canon EOS Full Frame","offer_id":44967781794077,"sku":"OPT-UHC-EOS-FF","price":161.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Nikon Full Frame","offer_id":44967781826845,"sku":"OPT-UHC-NIKON-FF","price":161.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Optolong-UHC-2inch__75062.1612994619.1280.1280.jpg?v=1684345844"},{"product_id":"antlia-u-venus-filter-1-25","title":"Antlia U-Venus Filter - 1.25\"","description":"\u003c!-- more --\u003e\nAntlia Venus-U filter is designed for imaging the cloud structure of Venus and Jupiter with CCD cameras on a telescope. Cloud details primarily reflect in the ultraviolet band which cannot normally be imaged using broadband filters. The Venus-U filter uses the latest dielectric interference coating technology to achieve high transmission efficiency and exceptional isolation of the critical UV bandwidths. The filter effectively blocks the contrast damaging frequencies beyond 400nm which typically swamp the ultraviolet cloud details on camera sensors. Like the highest quality Antlia LRGB filters, the U-Venus filter minimizes halos around bright stars and increase the contrast.\u003cbr\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRecommendations in the use of this filter: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1. When U-Venus filter is used with a planetary camera, it is recommended to remove any protective UV-IR window in front of a color planetary camera because this filter may attenuate transmittance of the critical ultraviolet band that contains cloud details.\u003c\/p\u003e\n\u003cp\u003e2. The lower the frequency in the UV band, the longer will be the exposure to achieve sufficient signal in your image. The sensitivity of most sensors also decreases rapidly at shorter UV wavelengths.\u003c\/p\u003e\n\u003cp\u003e3. It should be noted that when using DSLR to shoot ultraviolet flowers, the camera needs to be specially modified to remove the infrared cut filter inside the camera.\u003c\/p\u003e\n\u003cp\u003e4. In non astronomical use, the lighting conditions may block UV transmissions e.g. the UV contents of electronic flash emission, because of a combination of lower emission at shorter wavelengths and increased absorption by the glass of the flash tube. These factors combine together to require a substantially increased exposure time (for continuous UV sources), UV intensity and ISO sensitivity as the wavelength decreases.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNon-astronomical applications：\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUse for general UV photography (flowers, health of plants,insects, forensics and medical imaging)\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eoptical substrate\u003c\/p\u003e\n\u003cp\u003eThickness: 1.25” mounted (2mm+\/-0.05mm)\u003c\/p\u003e\n\u003cp\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003c\/p\u003e\n\u003cp\u003e30 arcsec parallelism\u003c\/p\u003e\n\u003cp\u003eTave＞80%\u003c\/p\u003e\n\u003cp\u003eOD3（＞0.001）@ 200-1050nm\u003c\/p\u003e\n\u003cp\u003e2 sides Dielectric multi-coating\u003c\/p\u003e\n\u003cp\u003eSingle \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1.25”(M28.5*0.6)\u003c\/p\u003e\n\u003cp\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNotes: \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1.Using the filter for visual observations is impossible due to the eye's insensitivity to this spectral range (UV). \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2.This filter is NOT to be used for visual observations, specifically the sun or UV light sources.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45078062792989,"sku":"ANT-UVENUS","price":283.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Antlia-U-Venus.jpg?v=1685815618"},{"product_id":"antlia-h-beta-and-oiii-visual-filter-1-25","title":"Antlia H-beta and OIII Visual Filter - 1.25\"","description":"\u003c!-- more --\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAntlia HB-OIII filter is engineered specifically for night visual nebulae observation at a high contrast and Deep-sky astrophotography. Its transmission is 90% or greater at critical wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm). You’ll notice much higher contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula, and extremely faint nebulae by Antlia HB-OIII filter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eWhen it is used for Astro Deep-sky imaging, it enhances the details of the OIII and H-Beta emission lines with astronomical cameras and DSLRs. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eMain Application and Performance:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAntlia HB-OIII filter was coated with almost total suppression of optical density (OD)4 on unwanted wavelength and the filter cut-off wavelength is 300-1000nm, which meets the spectral requirements of photographic cameras and further enhances the suppression of the IR region, compared with the visual filters with a cut-off depth of OD3@350-750nm, it performs better to darken the sky background and make deep-sky observation and photography of nebulae, star clusters, and galaxies more easily.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe HB-OIII filter helps faint objects become much more visible against the blackened background and produces near-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under both light-polluted and dark skies.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSince human eyes are less sensitive at night, large aperture telescopes are recommended to gather light and funnel it into the observer's eyes.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45328145711389,"sku":"ANT-HB-OIII-1.25","price":141.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Antlia-Hbeta-OIII-Visual-Filter.png?v=1688578775"},{"product_id":"dav-cf-1-25","title":"David Astro Planetary Color Filter Kit with Case - 1.25\"","description":"\u003c!-- more --\u003e\n\u003cul\u003e\n\u003cli\u003eFilter No.12\u003c\/li\u003e\n\u003cli\u003eFilter No.21\u003c\/li\u003e\n\u003cli\u003eFilter No.23A\u003c\/li\u003e\n\u003cli\u003eFilter No.56\u003c\/li\u003e\n\u003cli\u003eFilter No.82\u003c\/li\u003e\n\u003cli\u003eMoon \u0026amp; Sky filter\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"David Astro","offers":[{"title":"Default Title","offer_id":49171614204189,"sku":"DAV-CF-1.25","price":48.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/DAV-CF-125.jpg?v=1729718830"},{"product_id":"david-astro-variable-polarizing-filter-1-25","title":"David Astro Variable Polarizing Filter - 1.25\"","description":"\u003c!-- more --\u003e\u003cp\u003eThe \u003cstrong\u003eVariable Polarizing Filter\u003c\/strong\u003e is an essential tool for astronomical observing, designed to enhance your viewing experience by reducing glare and controlling brightness. This adjustable filter allows you to fine-tune the amount of light entering your eyepiece, making it ideal for observing the Moon, planets, and bright stars without overwhelming glare.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Light Transmission\u003c\/strong\u003e: Allows continuous control over light levels from 1% to 40%, perfect for adapting to various brightness conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Contrast\u003c\/strong\u003e: Reduces glare and enhances detail, especially for lunar and planetary observations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy to Use\u003c\/strong\u003e: Simple twist mechanism lets you adjust the filter’s density on the fly without removing it from the eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Quality Optics\u003c\/strong\u003e: Made from precision glass for clear, distortion-free viewing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Compatibility\u003c\/strong\u003e: Fits standard telescope eyepieces, ensuring broad usability across different setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhether you're reducing the brightness of a full Moon or bringing out fine details on planets, the Variable Polarizing Filter provides better control and comfort during your stargazing sessions.\u003c\/p\u003e","brand":"David Astro","offers":[{"title":"Default Title","offer_id":49179007811869,"sku":"DAV-VPOL-1.25","price":28.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/DAV-VPOL-1.25_5a5f6bb7-07fe-467c-9a4f-5eacf9b56757.jpg?v=1726771715"},{"product_id":"antlia-ch4-methane-filter-1-25","title":"Antlia CH4 Methane Filter - 1.25\"","description":"\u003c!-- more --\u003e\u003cp\u003eAntlia methane (CH4) filter is a specialized filter that allows light in the near infrared portion of the spectrum centered at 889nm to pass through with a bandpass that is 20nm wide. This filter was developed in order to measure finer details and more contrast of the methane that is characteristic of Jupiter, Mars, Saturn and other planets.\u003cbr\u003eThe human eye is not sensitive to light beyond about 700nm hence no person can see what is transmitted by this filter, so this filter is not suitable for visual applications.\u003c\/p\u003e\n\u003cp\u003eThe Methane (CH4) filter is recommended for planetary imaging such like Mars, Jupiter, Saturn and the other planets.\u003cbr\u003eIn order to produce good results, you are likely to require relatively longer exposures times and larger aperture telescope with this filter than with other filters.\u003c\/p\u003e\n\u003cp\u003eTechnical Data:\u003cbr\u003eoptical substrate\u003cbr\u003eThickness: 1.25” (2mm+\/-0.05mm)\u003cbr\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003cbr\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003cbr\u003e30 arcsec parallelism\u003cbr\u003eCenter-Wavelength of Antlia CH4 filter: 889nm\u003cbr\u003eTave＞90% , 90% transmission at 889nm\u003cbr\u003eOD5（0.001%）@ 200-1050nm\u003cbr\u003e2 sides Multi-layers anti-reflection coating\u003cbr\u003eSingle \/ Non-glued substrate\u003c\/p\u003e\n","brand":"Antlia","offers":[{"title":"Default Title","offer_id":50257849975069,"sku":"ANT-CH4","price":236.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ABUIABACGAAgsuPZ_AUovoD4vQIwoAY4oAY.jpg?v=1755106117"},{"product_id":"optolong-variable-polarizing-filter","title":"Optolong Variable Polarizing Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eContinuously Variable Light Transmission\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" Barrel Sizes\u003c\/li\u003e\n\u003cli\u003eIdeal for Lunar, Planetary, and Terrestrial Viewing\u003c\/li\u003e\n\u003cli\u003eReduces Glare and Enhances Contrast\u003c\/li\u003e\n\u003cli\u003eDurable CNC-Machined Metal 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\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\u003eOptolong Variable Polarizing Filter\u003c\/h2\u003e\n\u003cp\u003eAvailable in both 1.25\" and 2\" barrel sizes, the Optolong Variable Polarizing Filter allows you to continuously adjust image brightness, providing precise glare control on the Moon and bright planets by simply rotating the filter housing.\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\u003eFine-Tune Brightness on the Moon, Venus, and More\u003c\/h3\u003e\n\u003cp\u003eUnlike a standard, fixed-transmission Moon filter, a variable polarizer acts like a dimmer switch for your eyepiece. By rotating the top half of the two-piece filter, you can dial in the perfect amount of light attenuation for any target. This allows you to apply maximum filtering to reduce the overwhelming glare of a full Moon, then back it off to preserve detail on a delicate crescent Moon or when observing Venus.\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\u003eBeyond Astronomy: Cutting Glare in Terrestrial Viewing\u003c\/h3\u003e\n\u003cp\u003eThis filter's utility extends to daytime terrestrial observation and photography. Just like a polarizing filter on a DSLR camera, the Optolong Variable Polarizer enhances views by cutting through reflected glare. When observing over water or through atmospheric haze, a simple turn of the filter can dramatically increase contrast and make distant details pop.\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\u003eSchott Glass Construction in a CNC-Machined Cell\u003c\/h3\u003e\n\u003cp\u003eOptolong builds this filter with high-quality Schott glass, which is then multi-coated using an ion-assisted deposition process. This technique ensures the coatings are durable, scratch-resistant, and optically stable. The filter cell is CNC-machined from lightweight, strong metal, then sand-blasted and black-anodized for maximum durability and stray light control. The result is a slim, robust filter that won't vignette and is built to last.\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\u003eVariable Polarizer vs. Fixed Moon Filter: The Key Difference\u003c\/h3\u003e\n\u003cp\u003eA standard Moon filter is a single piece of neutral density glass with a fixed transmission percentage. It works, but it's a one-size-fits-all solution. A variable polarizing filter offers critical flexibility.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed Moon Filter:\u003c\/strong\u003e Provides one level of brightness reduction. May be too dark for a crescent Moon or not dark enough for a full Moon at high power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptolong Variable Polarizer:\u003c\/strong\u003e Lets you set the brightness precisely for the target, your telescope's aperture, and the current seeing conditions, ensuring you never over- or under-dim the view.\u003c\/li\u003e\n\u003c\/ul\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\"\u003eHow do I adjust the brightness with the Optolong Variable Polarizing Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSimply thread the filter onto a 1.25\" or 2\" eyepiece or accessory. Then, while looking through the eyepiece, slowly rotate the top ring of the filter. You will see the image brightness change, allowing you to set the most comfortable and detailed view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the main advantage of the Optolong Variable Polarizing Filter over a standard Moon filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe key advantage is \u003cstrong\u003eflexibility\u003c\/strong\u003e. A standard Moon filter has a fixed light reduction (e.g., 25% or 13% transmission). The Optolong Variable Polarizing Filter allows you to continuously adjust the brightness, making it adaptable to any lunar phase, planet, or even daytime terrestrial viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong Variable Polarizing Filter for observing the Sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eAbsolutely not.\u003c\/strong\u003e The Optolong Variable Polarizing Filter is \u003cstrong\u003eNOT a solar filter\u003c\/strong\u003e and is not designed for direct solar observation. Attempting to view the Sun with this filter will cause immediate and permanent eye damage and will destroy your equipment. Only use certified solar filters for solar viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Optolong Variable Polarizing Filter improve views of the Moon through my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent tool for an 8\" SCT. The large aperture of your telescope gathers a great deal of light, making the Moon uncomfortably bright. The Optolong Variable Polarizing Filter allows you to reduce the glare to a comfortable level, which increases contrast and makes it easier to see fine details like rilles, crater walls, and maria.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Optolong Variable Polarizing Filter work for daytime, terrestrial viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor terrestrial use, the Optolong Variable Polarizing Filter cuts down on polarized, reflected light. This is especially effective for reducing glare from water, glass, or wet surfaces. By rotating the filter, you can darken the sky, enhance the color of foliage, and see through reflections, improving overall image contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm trying to photograph a waterfall with my telescope; will the Optolong Variable Polarizing Filter help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. When used for terrestrial photography, the Optolong Variable Polarizing Filter will reduce the harsh glare off the water's surface and wet rocks. This will allow your camera to capture more saturated colors and detail that would otherwise be washed out by reflections.\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\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Round Mounted, 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Material\u003c\/td\u003e\n\u003ctd\u003eSchott Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eMulti-coated with ion-assisted deposition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Material\u003c\/td\u003e\n\u003ctd\u003eCNC Machined, Anodized Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Round Mounted","offer_id":50344085651741,"sku":"OPT-12501","price":52.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":50344085684509,"sku":"OPT-12502","price":64.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/optolong-variable-polarising-filter-2-inch-237882_700x700_jpg.webp?v=1757631904"},{"product_id":"baader-c2-swan-band-comet-filter-15nm","title":"Baader C2 Swan-Band Comet Filter (15nm)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eTargets C2 Swan Bands in comet gas tails\u003c\/li\u003e\n\u003cli\u003e15nm bandpass for high-contrast views\u003c\/li\u003e\n\u003cli\u003eO-III parallel transmission for nebula observation\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" mounted formats\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\u003eDownloads\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\u003eBaader C2 Swan-Band Comet Filter (15nm)\u003c\/h2\u003e\n\u003cp\u003eThe Baader C2 Swan-Band Comet Filter isolates faint cometary emissions within a narrow 15nm bandpass, dramatically increasing the contrast of gas tails against the skyglow. This specialized design targets the unique C2 Swan Bands, revealing delicate streamers and structures that are lost when using general-purpose nebula filters, and is available in both 1.25\" and 2\" mounted formats to fit any standard eyepiece or accessory.\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\u003eIsolating Comet Gas Tails: The 15nm C2 Swan-Band Advantage\u003c\/h3\u003e\n\u003cp\u003eWhile a comet's bright dust tail is simply reflected sunlight, its ion or gas tail glows with its own distinct light. The Baader C2 Swan-Band filter is engineered with a 15nm bandpass to isolate this specific emission from diatomic carbon (C2), which is ejected from the comet's nucleus. By blocking out interfering skyglow and light from the dust tail, the filter makes the faint, ethereal structure of the gas tail visible.\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\u003eA Dual-Purpose Filter: O-III Parallel Transmission\u003c\/h3\u003e\n\u003cp\u003eUnlike single-purpose comet filters, the Baader C2 Swan-Band filter is designed to be \"O-III parallel.\" This means its transmission window also passes the critical 501nm line from doubly-ionized oxygen (O-III), the same light emitted by planetary and other emission nebulae. This clever design allows the filter to serve a dual role in your accessory case, enhancing views of objects like the Dumbbell Nebula (M27) or the Orion Nebula (M42).\u003c\/p\u003e\n\u003cp\u003eWhile a dedicated, narrower O-III filter will provide the absolute highest contrast on nebulae, the C2 filter offers a significant boost over unfiltered views, making it a more useful tool than a filter you might only use once every few years for a bright comet.\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\u003eC2 Swan-Band vs. UHC\/O-III Filters: Why Specialization Matters for Comets\u003c\/h3\u003e\n\u003cp\u003eAn observer's first instinct might be to use a standard UHC or O-III nebula filter on a comet, but this is often counterproductive. Those filters are designed to block the very wavelengths the comet's gas tail emits.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eO-III Filters:\u003c\/strong\u003e A typical O-III filter will completely block the C2 Swan Bands, effectively making the gas tail invisible while doing nothing to dim the dust tail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUHC \/ Broadband Filters:\u003c\/strong\u003e While better than nothing, a UHC filter's bandpass is too wide, allowing significant skyglow and light from the dust tail to pass through, which reduces contrast and hides faint detail.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Baader C2 Swan-Band filter is the correct tool for the job. It selectively passes the light from the gas tail while rejecting the light that obscures it, delivering a view that general-purpose filters cannot match.\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 the Baader C2 Swan-Band filter do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader C2 Swan-Band filter is a narrow-band filter designed to increase the contrast of a comet's gas (ion) tail. It has a \u003cstrong\u003e15nm bandpass\u003c\/strong\u003e that selectively transmits light from diatomic carbon (C2), which is the primary emission from the gas tail, while blocking out light pollution and excessive glare from the comet's dust tail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader C2 Swan-Band filter for objects other than comets?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The filter is designed with \"O-III parallel\" transmission, meaning it also passes light from doubly-ionized oxygen. This makes it effective for enhancing contrast on many emission nebulae, particularly planetary nebulae like the Ring Nebula (M57) and larger structures like the Veil Nebula (NGC 6960).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this 15nm C2 filter compare to a standard O-III filter for viewing nebulae?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA dedicated O-III filter will typically have a narrower bandpass (e.g., 7-12nm) and will provide higher contrast on O-III-rich objects. The Baader C2 filter's 15nm bandpass is wider to accommodate the Swan Bands, so while it provides a significant enhancement on nebulae, a specialized O-III filter will yield a darker sky background and more pronounced detail on those specific targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader C2 Swan-Band filter help me see the dust tail of a comet?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the opposite is true. The dust tail shines by reflecting sunlight, which is broadband white light. This filter is designed to \u003cstrong\u003eblock\u003c\/strong\u003e most of that light to make the faint, self-luminous gas tail stand out. It will dim the dust tail and coma significantly to improve the visibility of the ion tail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm observing a bright comet with my 10\" f\/5 Dobsonian. Will the Baader C2 filter really make a difference?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. In a 10\" telescope, a bright comet's coma and dust tail can be overwhelmingly bright, washing out the fainter gas tail. The Baader C2 filter will dim the coma and dust tail, darkening the background sky and allowing the delicate streamers, knots, and structure within the gas tail to become clearly visible. It often reveals a tail that was completely invisible without filtration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 2\" Baader C2 Swan-Band filter for imaging a planetary nebula like the Dumbbell Nebula (M27)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the filter can be used for imaging. Because it passes O-III, it can be effective for capturing detail in planetary nebulae. For serious tri-color imaging, dedicated narrowband filters (O-III, H-alpha, S-II) are superior, but for one-shot color or monochrome imaging, the C2 filter can help isolate nebular structure from a light-polluted sky.\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\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e15nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Transmission\u003c\/td\u003e\n\u003ctd\u003eC2 Swan Bands\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Transmission\u003c\/td\u003e\n\u003ctd\u003eO-III Parallel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Mounted, 2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eGas evolution of comets, O-III-paralel Imaging, Contrast Enhancement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd\u003e513 nm (for the C2 lines at 511 and 514nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003e≤ 505 – 520 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003edielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e2\" Mounted\u003c\/h3\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter size\u003c\/td\u003e\n\u003ctd\u003e2 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHBW (Halfbandwidth)\u003c\/td\u003e\n\u003ctd\u003e≤ 15nm\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\"\u003eBaader C2 Swan-Band Comet Filter (Selected Size)\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\"\u003eProtective 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\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Filter_Problems_FAQ_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Filter Problems FAQ Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\" Mounted","offer_id":51320832950557,"sku":"BAA-2961860","price":116.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":51320832983325,"sku":"BAA-2961863","price":232.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-Swan-Band-Comet-Filter.jpg?v=1779478120"},{"product_id":"tele-vue-bandmate-nebustar-filter","title":"Tele Vue BandMate Nebustar Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnique Narrowband Design:\u003c\/strong\u003e Transmits both Hβ and OIII emission lines in a single, targeted passband for maximum contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlocks Red Wavelengths:\u003c\/strong\u003e Unlike standard UHC filters, it eliminates red light to prevent star bloat and produce sharper, natural-looking stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in Germany by Astronomik:\u003c\/strong\u003e All materials and manufacturing are German-sourced and produced by a world leader in astronomical filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndividually Tested and Serialized:\u003c\/strong\u003e Every filter is optically tested by Tele Vue and spectrographically verified by Astronomik to ensure peak optical quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Application:\u003c\/strong\u003e Engineered as a superior general-purpose nebula filter for telescopes of any aperture or design.\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\u003eTele Vue BandMate Nebustar Filter\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue BandMate Nebustar Filter, available in 1.25\" and 2\" formats, is a unique narrowband nebula filter that transmits key Hβ and OIII emission lines while completely blocking red wavelengths to eliminate star bloat. Manufactured in Germany for Tele Vue by Astronomik, each serialized filter passes a 5-point inspection process, including optical and spectrographic testing, to guarantee zero image degradation.\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\u003eHβ + OIII Transmission in 1 Filter\u003c\/h3\u003e\n\u003cp\u003eThe Nebustar's design captures the two most prominent non-red emission lines from nebulae—Oxygen-III and Hydrogen-beta—in a single, efficient passband. This dual-line transmission makes it a highly effective general-purpose tool, dramatically darkening the sky background and boosting contrast on a wide variety of targets.\u003c\/p\u003e\n\u003cp\u003eFrom the Veil Nebula (NGC 6960) to the Orion Nebula (M42), the filter reveals faint structures that are often lost to urban skyglow. It excels in telescopes of all apertures by isolating the nebula's light from the background, making faint details pop into view.\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\u003eA 5-Point Quality Control Process for Zero Image Degradation\u003c\/h3\u003e\n\u003cp\u003eEvery BandMate Nebustar filter is held to a standard far exceeding typical production filters. Each unit is individually serialized and subjected to a comprehensive, multi-stage inspection process by both Astronomik in Germany and Tele Vue in the USA to ensure it will not alter the pristine views your telescope produces.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpectrographic Analysis:\u003c\/strong\u003e Astronomik verifies that the coating's transmission curve meets the exact design specification for the Hβ and OIII passband.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Testing:\u003c\/strong\u003e Tele Vue inspects each filter at high power to ensure it does not degrade image sharpness or introduce any optical aberrations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Testing:\u003c\/strong\u003e The filter housing is tested for proper threading and fit in standard 1.25\" or 2\" accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCosmetic Inspection:\u003c\/strong\u003e A detailed visual check is performed to screen for any pinholes, digs, or sleeks in the coating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerialization:\u003c\/strong\u003e Each filter receives a unique serial number, creating a permanent record of its quality control passage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eNebustar vs. Standard UHC: Why Blocking Red Matters\u003c\/h3\u003e\n\u003cp\u003eThe critical distinction between the Nebustar and a traditional UHC (Ultra High Contrast) filter is its treatment of the red end of the spectrum. Standard UHC filters also pass the red Hydrogen-alpha line, which can cause bright, reddish stars to appear bloated and unnaturally colored, distracting from the nebula itself.\u003c\/p\u003e\n\u003cp\u003eBy specifically blocking all red wavelengths, the Nebustar produces a view with tighter, sharper, and more color-neutral stars. This creates a more aesthetically pleasing image where the subtle blues and greens of planetary and emission nebulae stand out against a dark background populated with pinpoint stars.\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 makes the Tele Vue Nebustar different from a regular UHC filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary difference is that the \u003cstrong\u003eTele Vue Nebustar blocks red wavelengths\u003c\/strong\u003e. Standard UHC filters pass red light (specifically H-alpha), which can cause bright stars to look bloated and reddish. The Nebustar's design provides enhanced nebulosity with sharper, more natural-looking stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Tele Vue Nebustar filter work well on the Orion Nebula (M42) in my 8\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The Nebustar is an excellent choice for the Orion Nebula (M42). It passes both the \u003cstrong\u003eHβ and OIII lines\u003c\/strong\u003e, which are strong in this object, allowing you to see fainter, intricate details in the nebula's wings and the Trapezium region while suppressing light pollution and sharpening surrounding stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Tele Vue Nebustar a good filter for galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the Nebustar is not recommended for galaxies. Galaxies are broadband objects, meaning they emit light across the entire visible spectrum. A narrowband filter like the Nebustar will block most of a galaxy's light, making it appear much dimmer. For galaxies, it's best to observe from a dark sky site without a filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does Tele Vue have Astronomik in Germany make the Nebustar filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTele Vue partners with \u003cstrong\u003eAstronomik\u003c\/strong\u003e because they are a world leader in producing high-quality, dielectrically-coated astronomical filters with precise transmission characteristics. Every filter is made in Germany, then independently tested by Tele Vue in the USA to ensure it meets their rigorous standards for optical quality, guaranteeing it won't degrade the image from your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Tele Vue Nebustar filter for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for visual use, the Nebustar can be used for color imaging. However, because it blocks red light, it prevents the capture of H-alpha, which is a critical wavelength for many emission nebulae. For serious astrophotography, dedicated multi-band or single-band (H-alpha, OIII, SII) filters are generally preferred.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Tele Vue Nebustar perform on the Veil Nebula (NGC 6960) with a large refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Veil Nebula is a classic OIII target, and the Nebustar performs exceptionally well on it. In a refractor, the filter will make the delicate, filamentary structure of the Veil stand out dramatically against a blackened sky background. The sharp, pinpoint stars delivered by the filter will complement the high-quality optics of your telescope.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNarrowband Nebula Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePassband\u003c\/td\u003e\n\u003ctd\u003eHβ (Hydrogen-Beta) and OIII (Oxygen-III)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocked Wavelengths\u003c\/td\u003e\n\u003ctd\u003eIncludes all red wavelengths\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" and 2\" (threaded for standard eyepieces\/accessories)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eGeneral-purpose visual observation of nebulae\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eAstronomik, Germany (for Tele Vue)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuality Control\u003c\/td\u003e\n\u003ctd\u003eIndividually tested (Optical, Spectrographic, Mechanical, Cosmetic) and Serialized\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\"\u003eTele Vue BandMate Nebustar Filter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 (in selected size)\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\"\u003eProtective 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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"1.25\" Mounted","offer_id":52661820653853,"sku":"TV-B2N-0125","price":204.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":52661820686621,"sku":"TV-B2N-0200","price":450.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele-Vue-B2N-0200_Bandmate-Type-2-Nebustar_v1.jpg?v=1785439830"},{"product_id":"svbony-moon-filter","title":"SVBONY Moon Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces glare for comfortable lunar and planetary observing\u003c\/li\u003e\n\u003cli\u003eFits any standard 1.25\" eyepiece or accessory\u003c\/li\u003e\n\u003cli\u003eStandard M28.5x0.6 filter threads\u003c\/li\u003e\n\u003cli\u003eEnhances contrast on bright celestial objects\u003c\/li\u003e\n\u003cli\u003eConstructed with a 1.85mm thick optical glass substrate\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 1.25\" Moon Filter\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY 1.25\" Moon Filter is an essential accessory for observing bright celestial objects, built on a 1.85mm glass substrate to ensure optical flatness. It threads directly into any standard 1.25\" eyepiece with its M28.5x0.6 threads, dimming the overwhelming glare of the Moon to reveal subtle surface detail. This filter improves contrast not just on the Moon, but on bright planets as well.\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\u003eReduce Glare with a 1.85mm Contrast-Boosting Filter\u003c\/h3\u003e\n\u003cp\u003eViewing the Moon, especially during its brighter phases, can be uncomfortably dazzling and wash out fine details. This filter reduces the overall brightness, acting like sunglasses for your telescope, which allows your eye to relax and perceive more subtle features like crater rays, rilles, and variations in mare composition. The 1.85mm thick optical glass is designed as a multi-bandpass filter that also helps darken the sky background, increasing the contrast between your target and the surrounding space.\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\u003eUniversal Fit: M28.5x0.6 Threads for 1.25\" Eyepieces\u003c\/h3\u003e\n\u003cp\u003eEngineered for maximum compatibility, the SVBONY Moon Filter features standard M28.5x0.6 threads. This ensures it can be screwed directly onto the barrel of any 1.25\" eyepiece, diagonal, or camera nosepiece. The durable, anodized metal housing protects the glass element, and its low-profile design allows it to be stacked with other filters, such as a color filter for planetary observation, to further isolate specific 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 is the primary purpose of the SVBONY 1.25\" Moon Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary purpose of the SVBONY 1.25\" Moon Filter is to reduce the intense glare from the Moon, making observation more comfortable and revealing finer surface details that are otherwise washed out by the brightness. It also enhances contrast on bright planets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY 1.25\" Moon Filter on planets like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While designed for the Moon, the SVBONY 1.25\" filter's glare-reducing properties are also effective for observing bright planets. It can help cut through the brightness of Jupiter and Venus, making it easier to see subtle cloud bands or phase details.\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 1.25\" Moon Filter to my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter is not attached to the telescope itself, but to your 1.25\" eyepiece or accessory. Simply screw the filter into the M28.5x0.6 threads on the bottom of your eyepiece barrel before inserting the eyepiece into the focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY 1.25\" Moon Filter help with city light pollution?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe source description notes it helps darken the sky background by filtering some wavelengths from man-made lighting. While it is not a dedicated deep-sky light pollution filter (like a UHC or CLS), it can provide a modest improvement in contrast on brighter objects observed from suburban skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this SVBONY filter compatible with a 2\" eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this specific model is the 1.25\" version with M28.5x0.6 threads and will not fit a 2\" eyepiece. SVBONY also manufactures a 2\" version (with M48x0.75 threads) for observers using larger format eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY 1.25\" Moon Filter for imaging the Moon with my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's very useful for lunar imaging. The Moon is bright enough to saturate camera sensors with very short exposures. Using the SVBONY 1.25\" Moon Filter allows you to use longer, more manageable exposure times, which can reduce noise and prevent blowing out highlights in bright areas like the crater Tycho.\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 Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Models\u003c\/td\u003e\n\u003ctd\u003eF9114A (1.25\"), F9114L (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Type\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6 (1.25\"), M48x0.75 (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\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 1.25\" Moon 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 Protective 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":52861233299741,"sku":"SV-F9114L","price":16.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861233332509,"sku":"SV-F9114A","price":20.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-1-25-Moon-Filter-Reduce-Glare-Optical-Glass-for-Telescope-1_d0fe9cfa-567e-4225-93aa-85aa17ec3b02.jpg?v=1788659999"},{"product_id":"svbony-sv155-7-piece-telescope-filter-set-125in","title":"SVBONY SV155 7-Piece Telescope Filter Set - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e7-Piece Filter Set\u003c\/li\u003e\n\u003cli\u003eIncludes Moon, CPL, and 5 Color Filters\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch Barrel Size\u003c\/li\u003e\n\u003cli\u003eM28.5*0.6 Filter Threads\u003c\/li\u003e\n\u003cli\u003e2mm Thick Optical Glass\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 SV155 1.25 inch 7-Piece Telescope Filter Set\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV155 7-piece filter set equips your 1.25-inch eyepieces for detailed lunar and planetary observation. This kit includes 7 essential filters—a Moon filter, a Circular Polarizing (CPL) filter, and 5 distinct color filters—all constructed from 2mm thick optical glass. Each filter threads directly into any standard 1.25-inch eyepiece with M28.5*0.6 threads, providing an immediate and noticeable boost in contrast on specific celestial targets.\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\u003eA 7-Piece Set for Lunar and Planetary Contrast\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive kit is designed as a powerful starter pack for visual observers. The 7 filters provide the tools needed to manage the overwhelming brightness of the Moon and to selectively enhance subtle details on the planets, which are often washed out by atmospheric turbulence or the planet's own brightness. Instead of a single, generic filter, you get a specialized selection to tackle specific observational challenges.\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\u003eCPL \u0026amp; Moon Filters: Cutting Glare on Bright Targets\u003c\/h3\u003e\n\u003cp\u003eObserving the Moon without a filter can be uncomfortably bright, causing your pupil to constrict and hiding faint surface features. The included Moon filter acts like a pair of sunglasses for your telescope, reducing overall brightness to reveal subtle rilles, crater walls, and mare textures. The CPL filter goes a step further by specifically blocking polarized light, which dramatically increases contrast not only on the Moon but also on planetary surfaces and atmospheres.\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\u003e5 Planetary Color Filters: Isolating Specific Surface Details\u003c\/h3\u003e\n\u003cp\u003eColor filters work by blocking certain wavelengths of light, which makes features of a complementary color stand out more clearly. This is a classic technique for bringing out faint details on planets that are otherwise invisible. The SV155 set includes five of the most useful planetary filters for visual work.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e#23A Bright Red:\u003c\/strong\u003e Sharpens boundaries of Mars' polar ice caps and enhances surface details.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#21 Orange:\u003c\/strong\u003e Increases contrast in Jupiter's cloud belts and helps reveal the Great Red Spot. Also useful for sharpening details on Mars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#12 Yellow:\u003c\/strong\u003e Brings out reddish and orange features on Jupiter and Saturn, and enhances crater details on the Moon.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#56 Bright Green:\u003c\/strong\u003e Enhances the view of ice fogs on Mars and improves contrast within Saturn's ring system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#82A Bright Blue:\u003c\/strong\u003e Accentuates atmospheric details, like the cloud belts and zones on Jupiter and Saturn.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUniversal 1.25\" Fit with M28.5*0.6 Threads\u003c\/h3\u003e\n\u003cp\u003eEach of the 7 filters in the SV155 set is housed in a durable aluminum alloy cell and features standard M28.5*0.6 threads. This ensures compatibility with virtually any 1.25-inch (31.7mm) telescope eyepiece, filter wheel, or camera nosepiece on the market. The 2mm thick optical glass is ground and polished to maintain the integrity of your optical train, ensuring you see planetary details without added distortion.\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 is the main purpose of the SVBONY SV155 7-piece filter set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV155 set is designed for visual observers to enhance contrast and detail on the Moon and planets. The \u003cstrong\u003eMoon and CPL filters\u003c\/strong\u003e reduce glare from bright objects, while the \u003cstrong\u003efive color filters\u003c\/strong\u003e selectively block parts of the light spectrum to make specific features, like Jupiter's cloud bands or Mars' polar caps, easier to see.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich filter from the SV155 set is best for viewing Jupiter's Great Red Spot?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e#21 Orange filter\u003c\/strong\u003e is the most effective in the SV155 set for enhancing Jupiter's Great Red Spot. It increases the contrast between the reddish spot and the surrounding lighter cloud zones. The \u003cstrong\u003e#82A Bright Blue filter\u003c\/strong\u003e is also useful for highlighting the boundaries of Jupiter's belts and zones.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the CPL filter in the SV155 set differ from the Moon filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eMoon filter\u003c\/strong\u003e is a neutral density filter; it reduces the brightness of all colors of light equally, acting like sunglasses to make viewing more comfortable. The \u003cstrong\u003eCPL (Circular Polarizing) filter\u003c\/strong\u003e specifically blocks polarized light, which is often reflected glare. This not only reduces brightness but can also significantly increase surface contrast, making it useful for planets as well as the Moon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV155 filters fit my telescope's 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The SVBONY SV155 filters feature standard \u003cstrong\u003eM28.5*0.6 threads\u003c\/strong\u003e and are designed for a \u003cstrong\u003e1.25-inch (31.7mm)\u003c\/strong\u003e barrel. They will screw directly into the base of almost any 1.25-inch eyepiece, regardless of the telescope brand.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are there five different colors in the SV155 filter set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDifferent colors are used to highlight specific features on different planets. A filter works by passing its own color while blocking others, which increases the contrast of features that have a complementary color. For example:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA \u003cstrong\u003ered filter\u003c\/strong\u003e helps see surface features on Mars.\u003c\/li\u003e\n\u003cli\u003eA \u003cstrong\u003eblue filter\u003c\/strong\u003e helps see atmospheric clouds on Jupiter and Saturn.\u003c\/li\u003e\n\u003cli\u003eAn \u003cstrong\u003eorange filter\u003c\/strong\u003e helps see details within Jupiter's belts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the SVBONY SV155 filters made of glass or plastic?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV155 filters are made with \u003cstrong\u003e2mm thick optical glass\u003c\/strong\u003e lenses set in anodized aluminum alloy frames for durability and clear, distortion-free views.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eColor Filter, Moon Filter, CPL Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.7mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM28.5*0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Thickness\u003c\/td\u003e\n\u003ctd\u003e2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003eGood\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861234446621,"sku":"SV-F9135A","price":38.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV155-1-25-inch-7-Piece-Filters-Set-for-Moon-Viewing-Telescope-Filter-1_9ad2a52d-c2c9-4f1e-9fdd-354f1685e58f.jpg?v=1788660045"},{"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":25.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861234774301,"sku":"SV-F9147B","price":27.0,"currency_code":"CAD","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"},{"product_id":"svbony-linear-polarizer-filter","title":"SVBONY Linear Polarizer Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces light transmission to a comfortable 13% for lunar viewing\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch barrel size fits most eyepieces and accessories\u003c\/li\u003e\n\u003cli\u003eThreads into any accessory with standard M28.5 x 0.6 filter threads\u003c\/li\u003e\n\u003cli\u003eNeutral-colored optical glass provides true-to-life color fidelity\u003c\/li\u003e\n\u003cli\u003eEnhances contrast on bright planets and the Moon for visual and photographic use\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 Linear Polarizer Filter 1.25\"\u003c\/h2\u003e\n      \u003cp\u003eThe Svbony 1.25-inch Linear Polarizer Filter is engineered to dramatically reduce the Moon's overwhelming glare by limiting light transmission to a comfortable 13%. This single filter threads directly into any standard M28.5 x 0.6 eyepiece or accessory, making it an essential tool for revealing fine lunar and planetary detail without straining your eyes.\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\u003eReduce Lunar Glare to a Comfortable 13%\u003c\/h3\u003e\n      \u003cp\u003eA full or gibbous Moon viewed through a telescope can be uncomfortably bright, overwhelming your eye and washing out subtle details. This filter transmits just 13% of the incoming light, dimming the view to a perfect level for extended observation. By reducing eye strain, you can spend more time studying crater walls, rilles, and maria without losing your dark adaptation.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eExtended Viewing Comfort:\u003c\/strong\u003e The 13% transmission makes long observing sessions possible without discomfort or after-images.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTrue Color Rendition:\u003c\/strong\u003e Made with neutral-colored optical glass, the filter reduces brightness without altering the Moon's natural grey and brown tones.\u003c\/li\u003e\n      \u003c\/ul\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\u003eUniversal Fit: Standard 1.25-inch M28.5 Threads\u003c\/h3\u003e\n      \u003cp\u003eDesigned for maximum compatibility, the Svbony filter features standard M28.5 x 0.6 threads in a 1.25-inch housing. This ensures it will connect securely to the vast majority of 1.25-inch eyepieces, diagonals, and camera nosepieces on the market. By cutting through glare, the filter boosts contrast, making it easier to see subtle details on the Moon and separate cloud bands on bright planets like Jupiter, both visually and for photography.\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 is the main purpose of the Svbony 1.25\" Linear Polarizer Filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIts primary purpose is to reduce the intense brightness of the Moon, making it more comfortable to observe through a telescope. It transmits only \u003cstrong\u003e13% of the light\u003c\/strong\u003e, which reduces glare and eye strain, and improves the contrast of surface features.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a 13% transmission level good for observing the Moon with the Svbony filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 13% transmission level is a carefully chosen balance. It's dark enough to cut the painful glare of a near-full Moon in most telescopes, but bright enough to still see fine details clearly. This allows for comfortable, long-duration study of the lunar surface.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Svbony Linear Polarizer Filter for objects other than the Moon?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it is also effective for reducing glare from other bright objects like Venus and Jupiter, helping to reveal subtle cloud details. However, it is a trade-off; because it blocks so much light, it is not suitable for viewing faint deep-sky objects like nebulae or galaxies, which would be rendered invisible.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Svbony filter fit my eyepieces?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIf you have standard \u003cstrong\u003e1.25-inch eyepieces\u003c\/strong\u003e, then yes. The Svbony filter has standard \u003cstrong\u003eM28.5 x 0.6\u003c\/strong\u003e threads, which is the industry standard for 1.25-inch astronomical filters and eyepieces.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this Svbony filter help when imaging Jupiter with my 8\" SCT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIn an 8\" SCT, Jupiter is extremely bright, which can lead to overexposed images and loss of detail. The Svbony 13% filter acts like sunglasses for your camera, reducing the planet's brightness to a more manageable level. This allows you to use longer exposures to reduce atmospheric seeing effects without blowing out the highlights on the planet's cloud bands.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Svbony 1.25\" filter change the color of the Moon or planets?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. The filter is made from \u003cstrong\u003eneutral-colored optical glass\u003c\/strong\u003e. It is designed to reduce the brightness across the entire visual spectrum evenly, so you see a dimmer but true-color view without any artificial color cast.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhen observing the lunar terminator with my 100mm refractor, is the Svbony 13% filter still useful?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhile the terminator (the line between light and shadow) is less bright than the full disk, a 13% filter can still be very helpful. It enhances contrast by darkening the sky background and reducing scattered light within the telescope, making the shadows along the terminator appear deeper and more defined. This can make low-relief features pop.\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 Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLight Transmission\u003c\/td\u003e\n\u003ctd\u003e13%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM28.5 x 0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eNeutral-Colored Optical Glass\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 1.25\" Linear Polarizer 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 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861235429661,"sku":"SV-F9165A","price":22.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861235462429,"sku":"SV-F9165B","price":17.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-Linear-Polarizer-Filters-1_5c6dd808-ea4a-406f-b5e1-0335afad20cf.jpg?v=1788660087"},{"product_id":"svbony-sv115-18nm-oiii-narrowband-filter","title":"SVBONY SV115 18nm OIII Narrowband Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2-inch diameter filter for standard eyepieces and accessories\u003c\/li\u003e\n\u003cli\u003e18nm bandpass isolates key Oxygen-III emission lines\u003c\/li\u003e\n\u003cli\u003e90% peak transmittance at 495.9nm and 500.7nm\u003c\/li\u003e\n\u003cli\u003eBlocks unwanted light pollution from 400-700nm\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\u003eDownloads\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 SV115 OIII Filter 2 inch 18nm\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV115 OIII Filter isolates nebula emissions by using an 18nm bandpass centered on the critical 495.9nm and 500.7nm Oxygen-III wavelengths. This 2-inch filter achieves 90% peak transmittance for these lines while blocking the surrounding light pollution spectrum from 400-700nm, dramatically increasing contrast for visual observation and imaging.\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\u003eIsolating Nebulae: The 18nm Oxygen-III Window\u003c\/h3\u003e\n\u003cp\u003eThis filter is engineered to pass only the light from doubly ionized oxygen, the signature emission of planetary and most emission nebulae. By rejecting nearly all other visible light across the 400-700nm spectrum, the SV115 darkens the sky background, making faint structures in objects like the Veil Nebula (NGC 6960) or the Dumbbell Nebula (M27) pop into view. The 18nm Full-Width at Half-Maximum (FWHM) is wide enough for bright visual views while still providing a significant contrast boost over broader UHC-style filters.\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\u003e90% Peak Transmittance for Brighter Details\u003c\/h3\u003e\n\u003cp\u003eHigh light transmission is critical, especially for a filter designed to reject most of the spectrum. The SV115's optical coatings deliver a 90% peak transmittance at the key 495.9nm and 500.7nm OIII lines, ensuring the targeted nebula signal reaches your eye or camera sensor with minimal loss. This efficiency means nebulae appear brighter and more detailed, which is particularly beneficial when observing from light-polluted locations or when using smaller aperture telescopes.\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\u003eSV115 18nm OIII vs. Narrower Filters: The Visual Advantage\u003c\/h3\u003e\n\u003cp\u003eCompared to scientific-grade 7nm or 3nm OIII filters, the SV115's 18nm bandpass represents a deliberate trade-off optimized for visual use and versatile imaging. While narrower filters produce even higher contrast, they often dim the view and surrounding stars excessively, sometimes making it difficult to locate targets.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrighter Image:\u003c\/strong\u003e The 18nm window allows more photons through, resulting in a brighter, more engaging visual experience, especially in mid-size telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore Natural Star Fields:\u003c\/strong\u003e By not being excessively restrictive, the SV115 retains more starlight, providing a more context-rich view of the nebula within its stellar neighborhood.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLess Sensitive to Off-Band Stars:\u003c\/strong\u003e The slightly wider bandpass is more forgiving for imaging systems, reducing the appearance of halos around very bright, off-band stars.\u003c\/li\u003e\n\u003c\/ul\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 types of celestial objects will the SVBONY SV115 18nm OIII filter improve most?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV115 OIII filter is specifically designed for \u003cstrong\u003eemission nebulae\u003c\/strong\u003e that are rich in doubly ionized oxygen. It provides the most dramatic improvement on planetary nebulae like the Ring Nebula (M57) and the Dumbbell Nebula (M27), as well as supernova remnants like the Veil Nebula (NGC 6960).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV115 18nm OIII filter perform on the Orion Nebula (M42) from a city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFrom a light-polluted site, the SV115 will be highly effective on the Orion Nebula (M42). It will darken the washed-out city sky, significantly boosting the contrast of the nebula's core and revealing the faint, wing-like structures that are normally invisible. The \u003cstrong\u003e18nm bandpass\u003c\/strong\u003e is an excellent compromise, cutting through skyglow while keeping the view bright enough to enjoy visually.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs an 18nm OIII filter like the SV115 good for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the SV115 is a capable filter for color camera astrophotography. While dedicated imagers often use narrower filters (e.g., 7nm), the \u003cstrong\u003e18nm bandpass\u003c\/strong\u003e is a great starting point for one-shot-color cameras, as it isolates the OIII signal effectively without being so restrictive that it requires extremely long sub-exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose an 18nm OIII filter over a narrower 7nm or 3nm version?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \u003cstrong\u003e18nm bandpass\u003c\/strong\u003e is generally better for visual astronomy. Narrower filters can dim the view too much, making faint objects difficult to see at all. The 18nm width provides a strong contrast enhancement while maintaining a brighter image and showing more stars in the field of view, which helps with orientation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV115 2-inch OIII filter work with my 8-inch f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. An 8-inch SCT is an excellent instrument for this filter. The 2-inch format allows you to use it with low-power, wide-field 2-inch eyepieces to frame large targets like the Veil Nebula (NGC 6960). The filter will dramatically increase contrast on these objects, which can be challenging in an SCT from suburban skies without filtration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the SVBONY SV115 OIII filter brighten nebulae?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo filter can make an object brighter than it is without a filter in perfectly dark skies. Instead, the SV115 works by \u003cstrong\u003eselectively dimming the background skyglow\u003c\/strong\u003e far more than it dims the nebula. This process dramatically increases the contrast between the nebula and the sky, making the nebula much easier to see.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNarrowband OIII (Oxygen-III)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral Wavelengths\u003c\/td\u003e\n\u003ctd\u003e495.9nm and 500.7nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM (Bandpass)\u003c\/td\u003e\n\u003ctd\u003e18nm (±2nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e400-700nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\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\"\u003eSV115 OIII Filter 2 inch 18nm\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\"\u003eProtective Plastic 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\u003cul class=\"DAV-grid\"\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":52861235527965,"sku":"SV-F9186A","price":64.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861235560733,"sku":"SV-F9186B","price":78.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV115-OIII-Filter-2-inch-18nm-Reducing-Light-Polution-1_4a007e91-244a-45a6-8067-b680fa8db4dc.jpg?v=1788660107"},{"product_id":"svbony-sv132-25nm-h-beta-narrowband-filter","title":"SVBONY SV132 25nm H-Beta Narrowband Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eTargets the 486nm Hydrogen-Beta emission line\u003c\/li\u003e\n\u003cli\u003e25nm bandpass for enhanced contrast\u003c\/li\u003e\n\u003cli\u003e80% peak transmittance at the H-Beta wavelength\u003c\/li\u003e\n\u003cli\u003eBlocks Mercury (Hg) and Sodium (Na) light pollution to 0.1%\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch barrel with M28.5*0.6 threads\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 SV132 H-Beta Filter 25nm 1.25inch\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV132 H-Beta Filter isolates a specific 25nm window around the 486nm H-Beta emission line, a critical tool for observing nebulae that are otherwise invisible. With 80% transmittance at its target wavelength and aggressive 0.1% blocking of common Mercury (Hg) and Sodium (Na) streetlight emissions, this 1.25-inch filter dramatically increases the contrast of famously difficult objects like the Horsehead Nebula (B33) and the California Nebula (NGC 1499).\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\u003eA 25nm Bandpass for Elusive Nebulae\u003c\/h3\u003e\n\u003cp\u003eCertain nebulae emit almost exclusively in the blue-green light of Hydrogen-Beta at 486nm. The SV132's 25nm FWHM (Full Width at Half Maximum) is engineered specifically for these targets. This bandpass is narrow enough to reject city glow and natural skyglow, yet wide enough to deliver a bright image in moderate to large-aperture telescopes under dark skies.\u003c\/p\u003e\n\u003cp\u003eWithout an H-Beta filter, objects like the Cocoon Nebula (IC 5146) are often completely lost against the background sky. By transmitting 80% of the nebula's specific light while dimming the surrounding stars and sky, the SV132 makes these challenging deep-sky targets achievable from your backyard.\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\u003e1\/4 Wave Optics and 0.1% Light Pollution Blocking\u003c\/h3\u003e\n\u003cp\u003eThe SV132 is built on a double-side polished optical glass substrate with a surface accuracy of 1\/4 wave, ensuring it does not degrade the sharpness or clarity of your telescope's optics. Advanced coatings reject light pollution from Mercury (Hg) vapor lamps at 435nm and 578nm, and Sodium (Na) vapor lamps at 589nm, with just 0.1% transmission.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHomogeneous Coatings:\u003c\/strong\u003e A planetary rotation system during the coating process ensures uniformity across the entire filter surface, preventing hotspots or variations in the passband.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Contrast Views:\u003c\/strong\u003e By precisely blocking out the 400-700nm continuum spectrum outside the H-Beta line, the filter renders a darker sky background, making the faint structure within nebulae pop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimized Halos:\u003c\/strong\u003e The combination of a quality 1.85mm thick substrate and precise coatings eliminates distracting halos around bright stars.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Specialist's Filter: When to Use the SV132 H-Beta\u003c\/h3\u003e\n\u003cp\u003eIt's critical to understand that the H-Beta filter is a specialized instrument, not a general-purpose \"nebula filter.\" While it is essential for H-Beta dominant objects, it will significantly dim or completely block the light from most other nebulae, galaxies, and star clusters which are brighter in other wavelengths like Oxygen-III or Hydrogen-Alpha.\u003c\/p\u003e\n\u003cp\u003eThe SV132's metal cell features standard M28.5*0.6 threads, making it compatible with any standard 1.25-inch eyepiece or accessory. For observers with 8-inch or larger telescopes seeking to hunt down the most elusive objects on their list, this filter is an indispensable tool.\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 specific objects is the SVBONY SV132 H-Beta filter for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV132 H-Beta filter is designed for a select group of emission nebulae that are almost invisible without it. Its primary targets are the \u003cstrong\u003eHorsehead Nebula (Barnard 33)\u003c\/strong\u003e, the \u003cstrong\u003eCalifornia Nebula (NGC 1499)\u003c\/strong\u003e, and the \u003cstrong\u003eCocoon Nebula (IC 5146)\u003c\/strong\u003e. It can also help with parts of the Lambda Orionis cluster (Collinder 69).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV132 H-Beta filter make the Orion Nebula (M42) look better?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it will make the Orion Nebula (M42) look significantly worse. M42 is extremely bright in Oxygen-III and Hydrogen-Alpha wavelengths, which the SV132 is designed to block. For targets like M42, M8 (the Lagoon Nebula), or M27 (the Dumbbell Nebula), a UHC or OIII filter is the correct choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is the SV132 H-Beta different from a UHC or OIII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThey target completely different wavelengths. The SV132 passes light at \u003cstrong\u003e486nm (H-Beta)\u003c\/strong\u003e. An OIII filter passes light around \u003cstrong\u003e500nm (Oxygen-III)\u003c\/strong\u003e, which is best for planetary nebulae. A UHC (Ultra High Contrast) filter has two passbands, one for H-Beta and one for OIII, making it a more general-purpose filter for most emission nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat telescope is best for the SVBONY SV132 25nm H-Beta filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis filter works best with moderate to large aperture telescopes, typically \u003cstrong\u003e8 inches (200mm) or larger\u003c\/strong\u003e. Because the target nebulae are inherently very faint, a larger aperture is needed to collect enough light for a satisfying view. It is most effective under dark skies, as severe light pollution can overwhelm even a narrowband filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the SVBONY SV132 have a 25nm bandpass?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e25nm bandpass (FWHM)\u003c\/strong\u003e is a balance between contrast and brightness. It is narrow enough to effectively block out most forms of light pollution and natural skyglow, which increases contrast. However, it's not so narrow that it makes the image too dim in amateur-sized telescopes, which can happen with ultra-narrow imaging filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 1.25\" SV132 H-Beta filter for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for visual use, it can be used for imaging with a color camera to enhance the H-Beta signal in certain targets. However, dedicated astrophotography filters typically have a much narrower bandpass (e.g., 3nm to 7nm) for maximum contrast and are often threaded for filter wheels or camera noses rather than eyepieces.\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\u003eFilter Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Size\u003c\/td\u003e\n\u003ctd\u003eM28.5*0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass (FWHM)\u003c\/td\u003e\n\u003ctd\u003e25±3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelength\u003c\/td\u003e\n\u003ctd\u003e486nm (Hydrogen-Beta)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e80% at 486nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e400-700nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury (Hg) Line Transmission\u003c\/td\u003e\n\u003ctd\u003e0.1% at 435nm \u0026amp; 578nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSodium (Na) Line Transmission\u003c\/td\u003e\n\u003ctd\u003e0.1% at 589nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\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\"\u003eSV132 1.25\" H-Beta 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\"\u003eProtective Plastic 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":52861235659037,"sku":"SV-W9102A","price":66.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861235691805,"sku":"SV-W9102B","price":73.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV132-H-Beta-Filter-25nm-1-25inch-Light-Pollution-Filter-1_63fda3de-6ff9-4a65-9f77-87ce7c5656e7.jpg?v=1788660123"},{"product_id":"svbony-sv139-nd0-6-neutral-density-moon-filter-125in","title":"SVBONY SV139 ND0.6 Neutral Density Moon Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces lunar glare with a fixed ND0.6 optical density\u003c\/li\u003e\n\u003cli\u003eTransmits a neutral 25% of incoming light\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch barrel fits most eyepieces\u003c\/li\u003e\n\u003cli\u003eMulti-coated optical glass for maximum contrast\u003c\/li\u003e\n\u003cli\u003eDurable 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\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 ND0.6 filter is a fixed-transmission neutral density filter for any standard 1.25-inch eyepiece, designed to reduce overwhelming lunar brightness to comfortable levels. By transmitting a neutral 25% of incoming light, the ND0.6 filter reveals subtle surface details on the Moon, from fine rilles to complex crater walls, without altering its natural color balance.\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\u003eTaming Lunar Glare: The ND0.6 (25% Transmission) Advantage\u003c\/h3\u003e\n\u003cp\u003eObserving the Moon, especially near its full phase, can be uncomfortably bright through a telescope, causing your pupil to contract and washing out fine detail. The SV139 ND0.6 filter cuts this glare by 75%, allowing your eye to relax and perceive significantly more surface contrast. This fixed 25% transmission is an ideal all-purpose reduction for viewing different lunar phases in a wide range of telescope apertures.\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\u003e1.25\" Anodized Aluminum Cell with Multi-Coated Optics\u003c\/h3\u003e\n\u003cp\u003eThe SV139 filter is built into a durable, black-anodized aluminum cell that threads directly onto any standard 1.25-inch eyepiece or accessory. The optical glass is fully multi-coated to suppress internal reflections and ghosting, ensuring that the only thing you see is a sharp, high-contrast image of your target. This construction prevents the filter itself from degrading the view it's meant to improve.\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\u003eSV139 ND0.6 vs. Variable Polarizing Filters: Simplicity and Throughput\u003c\/h3\u003e\n\u003cp\u003eA variable polarizing filter offers adjustable brightness, which can be useful for different targets. However, the SVBONY SV139 ND0.6 filter's single-element design provides higher light throughput and fewer internal surfaces for reflections compared to a stacked polarizer. Its simplicity means there's no need to dial in the correct setting—it delivers a consistent 25% transmission for reliable, high-contrast lunar views every time.\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\"\u003eHow does the SVBONY SV139 ND0.6 filter perform on the full Moon in an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt's an excellent match. An 8\" Schmidt-Cassegrain gathers significant light, making the full Moon uncomfortably bright. The \u003cstrong\u003eND0.6\u003c\/strong\u003e filter reduces the glare to a comfortable \u003cstrong\u003e25%\u003c\/strong\u003e, allowing you to see sharp detail along the terminator and within bright ray systems like those of Copernicus and Tycho without dazzling your eye.\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 see more detail on Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, particularly in larger telescopes. While primarily a lunar filter, the SV139 can reduce the intense brightness of planets like Jupiter and Venus, which can help in discerning subtle features. In an 8\" or larger telescope, cutting the glare can make it easier to pick out faint cloud bands or the Great Red Spot on Jupiter.\u003c\/p\u003e\n\u003c\/div\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 refers to an optical density of 0.6. This means the filter transmits 10\u003csup\u003e-0.6\u003c\/sup\u003e, or \u003cstrong\u003e25%\u003c\/strong\u003e, of the light that passes through it. It's a logarithmic scale where ND0.3 is 50% transmission, ND0.6 is 25%, and ND0.9 is 12.5%. The ND0.6 is considered a great medium-level filter for general lunar work.\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 density\u003c\/strong\u003e filter, the SV139 is engineered to reduce brightness equally across the entire visible spectrum. Unlike color filters (e.g., yellow or blue), it will not impart any tint, preserving the Moon's true grey and white coloration.\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 filter has standard \u003cstrong\u003e1.25-inch filter threads (M28.5x0.6)\u003c\/strong\u003e. You simply screw it into the threaded barrel of any standard 1.25-inch eyepiece. It can also be attached to other 1.25-inch accessories like diagonals or Barlow lenses that accept filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV139 ND0.6 a good choice for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for lunar and bright planetary imaging. It helps prevent the camera sensor from being overexposed by the bright lunar surface or planets. This allows you to use longer exposure times to capture fainter details or lower the camera's gain for reduced noise in your final image.\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 Density\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\"\u003eSV139 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\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":52861235986717,"sku":"SV-W9108A","price":13.0,"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_f7341da8-b200-4c68-9ed6-96d125fb3a9f.jpg?v=1788660179"},{"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":13.0,"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-W9108B_29210557-1fc0-4351-b54b-60152cf50f46.jpg?v=1788660188"},{"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 ND1.2 Density\u003c\/li\u003e\n\u003cli\u003eTransmits 6.25% 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 ND1.2 Neutral Density Filter\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV139 1.25-inch ND1.2 filter is engineered to transmit just 6.25% 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 sixteen (a 4-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\u003eND1.2 Density: 6.25% 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 ND1.2 density provides a 93.75% 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 \"ND1.2\" mean for the SVBONY SV139 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eND1.2\u003c\/strong\u003e signifies a Neutral Density filter that allows \u003cstrong\u003e6.25% of light to pass through\u003c\/strong\u003e it (a transmission factor of 10^-1.2). This is equivalent to a 4-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 ND1.2 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 ND1.2 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 ND3.0, 0.1% 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 ND1.2 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\u003eND1.2 (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 ND1.2 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"},{"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\u003eND3.0 Neutral Density Filter\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch Barrel Size\u003c\/li\u003e\n\u003cli\u003eTransmits 0.1% of Incoming Light (10-Stop \/ 1000× Reduction)\u003c\/li\u003e\n\u003cli\u003eIdeal for Herschel Solar Wedges \u0026amp; Solar Imaging Accessories\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated Optical Glass in Black 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 ND3.0 Neutral Density Filter\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV139 1.25-inch ND3.0 Neutral Density filter provides an intense 0.1% light transmission (a 10-stop or 1000× reduction) without altering natural color rendition. This specialized filter threads directly into standard 1.25-inch eyepieces and accessories, serving as an essential light attenuation tool primarily used alongside Herschel solar wedges, dedicated solar setups, and specialized solar imaging rigs.\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\u003eND3.0 Transmission: Safe Light Reduction for Solar Wedges \u0026amp; Imaging\u003c\/h3\u003e\n\u003cp\u003eBecause an ND3.0 filter cuts 99.9% of incoming light, it is far too dark for nighttime lunar or planetary observation. Instead, its core application is downstream solar light control. When paired with a Herschel solar wedge (which reflects 95–96% of sunlight away), the SV139 ND3.0 filter safely steps down the remaining intense beam to a comfortable level for white-light solar viewing of sunspots, granulation, and solar faculae.\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 Optical Glass in a Standard 1.25\" Cell\u003c\/h3\u003e\n\u003cp\u003eConstructed with high-quality fully multi-coated optical glass, the SV139 minimizes internal reflections and maintains crisp image contrast. The standard 1.25-inch cell features double-sided threads (M28.5 x 0.6mm), allowing you to easily stack it with a Polarizing filter or a solar continuum filter for further light fine-tuning.\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 is the main use for an ND3.0 filter in astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \u003cstrong\u003eND3.0 filter\u003c\/strong\u003e reduces light intensity by 99.9% (transmitting just 0.1%, or a 10-stop reduction). Because it is so dark, it is primarily used in solar observation downstream of a Herschel solar wedge to bring the remaining light down to safe, comfortable visual or photographic levels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I look at the Sun using ONLY this ND3.0 filter on my eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNO. NEVER use an ND3.0 filter alone at the eyepiece for solar viewing.\u003c\/strong\u003e Unfiltered sunlight focused by a telescope aperture will instantly shatter or melt an eyepiece filter and cause permanent blindness. An ND3.0 filter must only be used \u003cem\u003ebehind\u003c\/em\u003e a proper front-aperture solar filter or inside a dedicated Herschel solar wedge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY ND3.0 filter for nighttime viewing of the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, an ND3.0 filter is generally far too dark for nighttime lunar observing. Cutting 99.9% of the light will render the lunar surface dim and difficult to perceive. For visual lunar observing, lighter filters like ND0.6 (25% transmission), ND0.9 (12.5% transmission), or ND1.2 (6.25% transmission) are recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is the ND3.0 filter used with a Herschel Solar Wedge?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Herschel wedge dumps ~95% of incoming solar energy out of its heat trap, but the remaining 5% light beam is still too bright for direct human eyes. Threading the ND3.0 filter into the wedge's eyepiece barrel reduces that remaining light by 99.9%, bringing the final view into a safe, comfortable intensity range for white-light solar observing.\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 ND3.0 with other filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The SV139 aluminum cell features threads on both sides. In solar setups, observers frequently stack an ND3.0 filter with a Variable Polarizer (to fine-tune brightness) or a Solar Continuum filter (to highlight sunspot details and contrast).\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 setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter features standard 1.25-inch threads (M28.5 x 0.6mm). It simply threads onto the bottom barrel of any standard 1.25-inch eyepiece, camera nosepiece, or Herschel wedge accessory adapter.\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\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\u003eND3.0 (0.1% Transmission \/ 10-Stop)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 in (M28.5 x 0.6 Thread)\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\" ND3.0 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":13.0,"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-W9108D_f30713f0-55c3-4128-9cfc-0ce4e0594c16.jpg?v=1788660207"},{"product_id":"explore-scientific-310250","title":"Explore Scientific 2\" Variable Polarizing Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2\" Filter Barrel Size\u003c\/li\u003e\n\u003cli\u003eContinuously Variable Brightness\u003c\/li\u003e\n\u003cli\u003eIdeal for Lunar, Planetary, and Solar Observing\u003c\/li\u003e\n\u003cli\u003eNeutral Gray Color Rendition\u003c\/li\u003e\n\u003cli\u003eStackable with Other 2\" Filters\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\u003eDownloads\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\u003e2\" Variable Polarizing Filter\u003c\/h2\u003e\n\u003cp\u003eThe 2\" Variable Polarizing Filter offers continuous brightness adjustment for any 2\" eyepiece, allowing you to dial down intense glare from the Moon and planets. This dual-threaded 2\" filter makes it possible to perfectly tailor the view to your target, revealing fine details that are washed out by excessive light.\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\u003eContinuously Variable Brightness Control for Your 2\" Eyepieces\u003c\/h3\u003e\n\u003cp\u003eUnlike fixed neutral density filters, this 2\" variable polarizer allows you to fine-tune image brightness on the fly. A simple rotation of the filter's two-part housing adjusts the light transmission, giving you precise control to match the viewing conditions and your target's brightness perfectly. The filter provides a neutral gray image, ensuring that colors remain true without any distracting tint.\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\u003eEliminate Glare on the Moon, Planets, and Sun\u003c\/h3\u003e\n\u003cp\u003eBright celestial objects like the full Moon and planets can be so dazzling that they hide subtle surface features. This 2\" filter acts like a dimmer switch for your telescope, reducing glare to reveal lunar rilles, planetary cloud bands, and delicate crater ejecta. It prevents the \"blooming\" effect that washes out high-contrast details.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCritical Solar Safety:\u003c\/strong\u003e For solar viewing, this 2\" filter is an essential tool for managing brightness but must \u003cstrong\u003eonly\u003c\/strong\u003e be used in conjunction with a dedicated, professional-grade solar filter (like a full-aperture white light filter or a Herschel wedge). It is not a standalone solar filter and will not protect your eyes from harmful radiation if used alone.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eStackable 2\" Design for Advanced Filter Combinations\u003c\/h3\u003e\n\u003cp\u003eEngineered for maximum utility, this filter features standard 2\" threads on both sides (internal and external). This design allows you to stack it with other 2\" filters from your collection. You can combine it with a color filter to enhance features on Mars or Jupiter while simultaneously controlling the planet's intense brightness.\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\u003eVariable Polarizer vs. Fixed ND Filters: The Control Advantage\u003c\/h3\u003e\n\u003cp\u003eWhile a fixed Neutral Density (ND) filter provides a single level of light reduction, a variable polarizer offers a major advantage in flexibility.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed ND Filter Advantage:\u003c\/strong\u003e A single ND filter is a simple, set-it-and-forget-it solution for a specific brightness level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" Variable Polarizer Advantage:\u003c\/strong\u003e This single filter effectively replaces an entire set of fixed ND filters. You can adjust for changing atmospheric seeing, different eyepiece magnifications, or the varying phases of the Moon without ever needing to swap filters at the eyepiece.\u003c\/li\u003e\n\u003c\/ul\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\"\u003eHow do I adjust the brightness with the 2\" Variable Polarizing Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOperation is simple: thread the 2\" filter onto your eyepiece or accessory, then slowly rotate the filter's housing. As you turn it, you will see the image dim or brighten, allowing you to set the perfect level of light transmission for your target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 2\" Variable Polarizing Filter for looking at the Sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but \u003cstrong\u003eONLY\u003c\/strong\u003e as a secondary filter. For safe solar viewing, you \u003cstrong\u003eMUST\u003c\/strong\u003e use this polarizing filter in combination with a dedicated, professional-grade, full-aperture solar filter or a Herschel wedge. Never use this filter as the primary or only protection for solar observation, as it does not block harmful UV and IR radiation and will result in permanent eye damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will this 2\" filter improve my view of Jupiter with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn a bright planet like Jupiter, this 2\" filter reduces glare that can wash out subtle details. By dimming the image to a comfortable level, you can more easily see fine cloud bands, the Great Red Spot, and shadow transits of the Galilean moons. The neutral gray tint ensures Jupiter's colors remain true.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this 2\" filter useful for observing the full Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The full Moon is bright enough to be uncomfortable and cause temporary flash-blindness, hiding fine details. This 2\" variable filter allows you to dim the view significantly, revealing incredible detail in crater walls, rays, and rilles without being overwhelmed by glare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 2\" Variable Polarizing Filter add any color to the view?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The filter is designed to provide a neutral gray filter effect. It reduces brightness across the visual spectrum evenly, so the natural colors of the Moon, planets, and stars remain unchanged.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack this 2\" variable polarizer with other filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The filter features both internal and external 2\" filter threads. This allows you to stack it with other filters, such as a color filter to enhance planetary features or a light pollution filter, giving you combined filtering effects.\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\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e4007922041025\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":52909408321821,"sku":"ES-310250","price":252.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-2-Variable-Polarizing-Filter-1_3f3af942-fd85-4fb0-9bd3-87d547e5b2d8.jpg?v=1789061604"},{"product_id":"player-one-ch4-8nm-1-25-inch-filter-e-series","title":"Player One CH4 8nm Filter E-series - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIsolates the 8nm methane (CH4) absorption band\u003c\/li\u003e\n\u003cli\u003eStandard 1.25″ filter cell format\u003c\/li\u003e\n\u003cli\u003eOptimized for modern CMOS and CCD planetary cameras\u003c\/li\u003e\n\u003cli\u003eE-series features high-quality optical glass and multi-layer coatings\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\u003eCH4 8nm 1.25″ Filter E-series\u003c\/h2\u003e\n\u003cp\u003eThe Player One CH4 8nm 1.25″ E-series Filter isolates the specific methane absorption band, darkening the methane-rich belts of Jupiter and Saturn to dramatically increase the visibility of high-altitude storms and atmospheric features. This E-series filter is built to a higher standard using high-quality optical glass and advanced multi-layer coatings, optimized for the high sensitivity of modern CMOS and CCD sensors.\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\u003eTargeting Gas Giants: The 8nm Methane Bandpass\u003c\/h3\u003e\n\u003cp\u003eMethane gas in the atmospheres of Jupiter and Saturn strongly absorbs sunlight. This filter's narrow 8nm bandpass is centered on this absorption line, making methane-rich areas appear very dark. Features at higher altitudes, above the main methane layers—such as bright equatorial zones and prominent storms like the Great Red Spot—reflect sunlight before it is absorbed and therefore stand out with exceptional contrast.\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\u003eE-Series Optics for CMOS\/CCD Imaging\u003c\/h3\u003e\n\u003cp\u003eThe E-series represents an upgrade in optical manufacturing, designed specifically for astrophotography with modern cameras. Each filter uses a high-quality glass substrate and multi-layer composite coatings to ensure high transmission within the narrow bandpass while suppressing unwanted out-of-band light. This construction minimizes halos and internal reflections, preserving the fine details captured by your sensor.\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\u003ePlayer One E-Series vs. S-Series: An Upgraded Standard\u003c\/h3\u003e\n\u003cp\u003ePlayer One offers two filter lines, and the E-series is the premium option for imagers seeking the best possible results. While the S-series provides excellent value, the E-series is manufactured to a higher standard.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstrate and Coatings:\u003c\/strong\u003e The E-series employs higher quality optical glass and more advanced multi-layer coating technology than the S-series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget Optimization:\u003c\/strong\u003e This upgraded construction is specifically aimed at maximizing the signal-to-noise ratio for sensitive CMOS and CCD cameras.\u003c\/li\u003e\n\u003c\/ul\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 is the primary purpose of the Player One E-series CH4 8nm filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary purpose of the \u003cstrong\u003ePlayer One CH4 8nm filter\u003c\/strong\u003e is to enhance the contrast of atmospheric features on Jupiter and Saturn. By selectively passing light only in the methane absorption band, it darkens the main cloud belts, making high-altitude phenomena like storms, ovals, and bright zones appear much more prominent in monochrome images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 8nm bandpass on the CH4 filter affect my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe narrow \u003cstrong\u003e8nm bandpass\u003c\/strong\u003e is a trade-off. It provides very high contrast by rejecting almost all light outside the methane line, but it also significantly dims the image. This requires longer exposure times or higher gain settings, making it best suited for planetary cameras with high sensitivity and low read noise. It is not suitable for visual observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main difference between the Player One E-series and S-series filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eE-series is an upgraded version of the S-series\u003c\/strong\u003e. According to Player One, the E-series uses a higher quality optical glass substrate and more advanced multi-layer composite coating technology. This results in a filter manufactured to a higher standard, optimized for professional results with modern CMOS and CCD cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 1.25\" E-series CH4 filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is designed exclusively for imaging. The 8nm bandpass is extremely restrictive and passes so little light that the image through an eyepiece would be far too dim for the human eye to see any detail. It relies on the ability of a camera sensor to accumulate light over time (long exposures).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the E-series CH4 filter improve my images of Jupiter with a C8 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a Celestron 8\" SCT, the \u003cstrong\u003ePlayer One CH4 filter\u003c\/strong\u003e will allow you to capture a high-contrast map of Jupiter's upper atmosphere. The Great Red Spot, which can sometimes have low contrast in visible light, will appear as a bright, high-altitude feature against the darkened South Equatorial Belt. You will also be able to more clearly define the structure of the bright Equatorial Zone and detect other smaller storms (ovals) that are difficult to resolve in broadband images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Player One CH4 filter useful for imaging Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003eCH4 filter\u003c\/strong\u003e is excellent for Saturn. It enhances the contrast of the planet's own atmospheric belts and zones, similar to its effect on Jupiter. Critically, it also darkens the planet's globe significantly more than the icy rings, which do not contain methane. This makes the rings stand out with brilliant separation from the planet itself, creating a striking and detailed image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cp\u003e\u003ca title=\"Player One 2-Year Warranty\" href=\"https:\/\/davidastro.com\/pages\/player-one-warranty-policy\" target=\"_blank\"\u003ePlayer One 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Player One","offers":[{"title":"Default Title","offer_id":52913424957725,"sku":"POA-CH4-125E","price":181.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"ioptron-tfe100","title":"iOptron Green Moon Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnhances contrast on lunar and planetary features\u003c\/li\u003e\n\u003cli\u003eReduces glare for more comfortable viewing\u003c\/li\u003e\n\u003cli\u003eImproves detail in Martian polar caps and dust storms\u003c\/li\u003e\n\u003cli\u003eHighlights cloud structures on Jupiter and Saturn\u003c\/li\u003e\n\u003cli\u003eThreads into standard astronomy eyepieces and accessories\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\u003eDownloads\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\u003eGreen Moon Filter\u003c\/h2\u003e\n\u003cp\u003eThe Green Moon Filter is a fundamental tool for visual observers seeking to increase contrast and reduce glare when viewing bright celestial objects. By selectively passing green light, this filter darkens the sky background and enhances specific surface and atmospheric details on the Moon and planets that are often washed out by unfiltered light. It provides a significant improvement in observable detail, making it an essential accessory for any eyepiece collection.\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\u003eEnhancing Lunar Detail: From Bright Maria to Subtle Rilles\u003c\/h3\u003e\n\u003cp\u003eWhen observing the Moon, especially during its brighter phases, overwhelming glare can flatten the view and hide subtle features. The Green Moon Filter dims the image to a more comfortable level while dramatically increasing the contrast between lunar features with different albedos (reflectivity). It excels at separating bright ejecta rays from the surrounding terrain and defining the boundaries of dark maria and the floors of craters.\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\u003ePlanetary Observation: Isolating Features on Mars, Jupiter, and Venus\u003c\/h3\u003e\n\u003cp\u003eBeyond the Moon, the Green Moon Filter is a versatile planetary accessory. On Mars, it improves the visibility of the polar ice caps and highlights surface frost and high-altitude clouds. For Jupiter and Saturn, it boosts the contrast of their atmospheric belts and zones. It's particularly effective at making the Great Red Spot on Jupiter stand out more clearly and can even help in discerning the faint cloud patterns on Venus.\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\u003eGreen vs. Neutral Density: Choosing the Right Filter for the Moon\u003c\/h3\u003e\n\u003cp\u003eObservers often choose between a green filter and a standard neutral density (ND) or \"Moon\" filter. While both reduce brightness, they serve different purposes.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeutral Density Filter:\u003c\/strong\u003e This filter reduces brightness uniformly across the entire visual spectrum, like sunglasses for your telescope. It provides a natural color view and is purely for glare reduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGreen Moon Filter:\u003c\/strong\u003e This filter provides targeted contrast enhancement by transmitting only a specific portion of the spectrum. While it also reduces glare, its primary function is to make specific red and blue-toned features appear darker, thereby increasing the visibility of subtle details. For detailed study, the green filter is often the superior choice.\u003c\/li\u003e\n\u003c\/ul\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 the Green Moon Filter do to the view of the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Green Moon Filter increases contrast and reduces overall glare. This makes it easier to see fine details like crater walls, rilles, and the subtle textures of the lunar maria. It gives the Moon a green tint but makes surface features stand out more distinctly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Green Moon Filter useful for planets?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is highly effective for several planets. It helps to distinguish the polar caps and dust storms on \u003cstrong\u003eMars\u003c\/strong\u003e, enhances the visibility of the cloud belts and Great Red Spot on \u003cstrong\u003eJupiter\u003c\/strong\u003e, and can reveal faint patterns in the thick atmosphere of \u003cstrong\u003eVenus\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Green Moon Filter improve views of Mars?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen observing Mars, the Green Moon Filter is excellent for increasing the contrast of the white polar ice caps against the planet's reddish surface. It also helps in identifying high-altitude atmospheric hazes and localized dust storms, which can be difficult to see without filtration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Green Moon Filter to see cloud bands on Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The Green Moon Filter enhances the boundaries between Jupiter's reddish-brown belts and its lighter zones. It is particularly useful for making the Great Red Spot (GRS) appear more defined and can help resolve smaller, transient storms within the Jovian atmosphere.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Green Moon Filter make the image dimmer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, all color filters reduce the total amount of light reaching your eye. This dimming effect is beneficial as it reduces glare on bright objects like the Moon and planets, making extended observation more comfortable and revealing more detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is a Green Moon Filter different from a variable polarizing filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003eGreen Moon Filter\u003c\/strong\u003e enhances contrast by selectively transmitting green light, which helps specific features stand out. A \u003cstrong\u003evariable polarizing filter\u003c\/strong\u003e is a type of neutral density filter that allows you to adjust the brightness from about 1% to 40% transmission without altering color. The polarizer is for controlling glare, while the green filter is for boosting contrast.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eColored Glass Filter - Green\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eLunar \u0026amp; Planetary Visual Observing\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\"\u003eGreen Moon 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\"\u003eProtective 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\u003cp\u003eNo downloads are available for this product.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWarranty information for this product is not available.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":52917295448349,"sku":"IOP-TFE100","price":20.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/iOptron-Green-Moon-Filter-1_232402bc-a3c5-4efc-a5d5-fd5c6c38b7bc.jpg?v=1789142198"},{"product_id":"optolong-moon-skyglow-filter","title":"Optolong Moon \u0026 Skyglow Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBlocks over 99% of common light pollution emission lines\u003c\/li\u003e\n\u003cli\u003eMaintains over 90% average transmission for bright, detailed views\u003c\/li\u003e\n\u003cli\u003eλ\/4 transmitted wavefront ensures no image degradation\u003c\/li\u003e\n\u003cli\u003eDurable B270 substrate with 1.85mm thickness\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" mounted sizes\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\u003eOptolong Moon \u0026amp; Skyglow Filter\u003c\/h2\u003e\n\u003cp\u003eThe Optolong Moon \u0026amp; Skyglow Filter dramatically improves visual and photographic contrast by blocking over 99% of disruptive artificial light pollution and natural skyglow. By maintaining an average transmission greater than 90% for desirable wavelengths, it darkens the sky background without dimming celestial targets, all while preserving image sharpness with a λ\/4 transmitted wavefront across its 1.85mm thick B270 glass substrate.\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\u003e\u0026gt;99% Light Pollution Rejection with \u0026gt;90% Transmission\u003c\/h3\u003e\n\u003cp\u003eThis filter isolates and rejects the most common sources of light pollution, such as sodium vapor streetlights, darkening the sky background to make faint details visible. With a high transmission rate of over 90% across the visible spectrum, galaxies, nebulae, and star clusters retain their brightness and structure, resulting in a significantly higher-contrast view.\u003c\/p\u003e\n\u003cp\u003eThis balanced approach makes the Moon \u0026amp; Skyglow filter highly versatile. It provides a noticeable improvement from moderately light-polluted skies without the aggressive color shifting of narrowband filters, making it an ideal general-purpose tool for both visual observing and astrophotography.\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\u003eλ\/4 Wavefront Accuracy and Durable B270 Construction\u003c\/h3\u003e\n\u003cp\u003eAn astronomical filter is useless if it degrades the sharp image from your telescope. Optolong constructs the Moon \u0026amp; Skyglow filter from B270 optical glass polished to a λ\/4 transmitted wavefront accuracy and 30s parallelism. These specifications ensure that the filter will not introduce aberrations or distortions, preserving the fine details on planetary surfaces and the pinpoint sharpness of stars.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIon-Assisted Coatings:\u003c\/strong\u003e Precision coatings are applied using an ion-assisted deposition process, ensuring durability, scratch resistance, and stable performance that does not shift with temperature changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60\/40 Surface Quality:\u003c\/strong\u003e This specification controls for cosmetic imperfections, guaranteeing a clean optical surface that won't scatter light or reduce contrast.\u003c\/li\u003e\n\u003c\/ul\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 is the primary purpose of the Optolong Moon \u0026amp; Skyglow filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Optolong Moon \u0026amp; Skyglow filter is a broadband light pollution filter designed to increase the contrast of celestial objects. It selectively blocks common wavelengths of artificial light and natural skyglow, which darkens the sky background and makes faint details on the Moon, planets, galaxies, and nebulae easier to see.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Optolong Moon \u0026amp; Skyglow filter improve my view of the Orion Nebula (M42) from the suburbs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFrom a suburban location, the skyglow washes out the faint, outer structures of nebulae like M42. The Optolong Moon \u0026amp; Skyglow filter blocks this interfering light, making the sky background appear much darker. This allows the faint nebulosity extending from the core of the Orion Nebula to stand out, revealing more of its intricate dust lanes and structure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Optolong Moon \u0026amp; Skyglow filter effective for planetary viewing in an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it can be beneficial. While planets are bright, they are often observed against a bright sky background, especially at lower altitudes. The filter darkens the sky immediately surrounding the planet, which can increase the perceived contrast of subtle details like Jupiter's cloud bands or Saturn's Cassini Division. It also helps reduce glare when observing the bright lunar surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Optolong Moon \u0026amp; Skyglow filter suitable for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this filter is very effective for astrophotography, particularly with one-shot color cameras. By blocking over 99% of major light pollution sources, it allows for longer sub-exposures before the skyglow saturates the sensor. This results in cleaner images with better contrast and more natural star colors compared to unfiltered shots from a light-polluted area.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the λ\/4 wavefront specification mean for the Optolong Moon \u0026amp; Skyglow filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003eλ\/4 (1\/4 wave)\u003c\/strong\u003e wavefront rating is a measure of optical precision. It guarantees that the filter's glass is flat and parallel enough that it will not distort the light passing through it by more than one-quarter of a wavelength of light. This is critical for high-resolution viewing and imaging, as it ensures the filter will not degrade the sharpness of the image produced by your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong Moon \u0026amp; Skyglow filter for solar observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eAbsolutely not.\u003c\/strong\u003e This filter is designed for night-sky use only and provides no protection from the Sun's harmful radiation. Looking at the Sun with this filter, or any filter not specifically designed for safe solar observation, will cause immediate and permanent eye damage, including blindness. Always use a certified solar filter that covers the front of your telescope.\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\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eB270 Optical Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAverage Transmission\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;99% (on light pollution lines)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Mounted, 2\" Mounted\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\"\u003eOptolong Moon \u0026amp; Skyglow 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\"\u003eProtective 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\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":52941911294237,"sku":"OPT-10501","price":45.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":52941911327005,"sku":"OPT-10502","price":67.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-Moon-Skyglow-Filter-1_176bee0d-3759-4793-929e-bc873bad8163.jpg?v=1789592332"},{"product_id":"optolong-oiii-18nm-filter","title":"Optolong OIII 18nm Nebula Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e18nm Bandpass Centered on OIII Emission Lines (500nm)\u003c\/li\u003e\n\u003cli\u003eGreater than 80% Average Light Transmission (Tave)\u003c\/li\u003e\n\u003cli\u003eBlocks \u0026gt;99% of Major Light Pollution Lines\u003c\/li\u003e\n\u003cli\u003e1.85mm Thick Optical Glass Substrate\u003c\/li\u003e\n\u003cli\u003eλ\/4 Transmitted Wavefront and 60\/40 Surface Quality\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\u003eOptolong OIII 18nm Nebula Filter\u003c\/h2\u003e\n\u003cp\u003eThe Optolong OIII 18nm Nebula Filter isolates the critical 500nm emission lines from planetary nebulae and supernova remnants with its focused 18nm bandpass. By achieving over 80% average transmission at these key wavelengths while blocking more than 99% of light pollution within its 400-700nm range, this filter dramatically increases contrast. The optically flat λ\/4 wavefront ensures your telescope's resolution is preserved, delivering sharp, high-contrast views even from suburban skies.\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\u003eIsolating Nebulae: The 18nm OIII Passband\u003c\/h3\u003e\n\u003cp\u003eThis filter is engineered to transmit a specific 18nm sliver of the blue-green spectrum, centered at 500nm. This window precisely captures the light from doubly ionized oxygen (OIII), the primary emission from targets like the Dumbbell Nebula (M27) and the Veil Nebula (NGC 6960). By isolating this light, the filter renders these faint structures visible against a darkened sky background.\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\u003eHigh-Contrast Views from Blocking \u0026gt;99% of Light Pollution\u003c\/h3\u003e\n\u003cp\u003eThe core function of the Optolong OIII filter is to improve contrast by aggressively rejecting unwanted light. It blocks over 99% of the primary wavelengths associated with mercury vapor, sodium vapor streetlights, and natural skyglow. This doesn't make the nebula brighter in absolute terms; it darkens the sky so severely that the nebula's faint details stand out in stark relief, transforming a washed-out view into a well-defined object.\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\u003ePrecision Optics: λ\/4 Wavefront and 60\/40 Surface Quality\u003c\/h3\u003e\n\u003cp\u003eA filter should only reveal detail, not degrade it. Optolong builds this filter on a 1.85mm optical glass substrate polished to a 60\/40 surface quality and a transmitted wavefront of λ\/4 or better. This level of optical precision ensures that the filter will not introduce aberrations or soften the image, preserving the sharpness delivered by your telescope's main optics. The multi-layer, ion-assisted coatings provide durability and resistance to scratching while ensuring wavelength stability regardless of temperature.\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\u003e18nm vs. Narrower OIII Filters: The Visual Advantage\u003c\/h3\u003e\n\u003cp\u003eWhile astrophotographers often use ultra-narrow 3nm or 7nm OIII filters, the 18nm bandpass of this Optolong filter is intentionally wider for visual astronomy. This wider window allows more photons to reach your eye, resulting in a significantly brighter and more comfortable view through the eyepiece.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrighter Image:\u003c\/strong\u003e The 18nm design prevents the image from becoming overly dim, which can happen with narrower filters, especially in telescopes under 8 inches of aperture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintains Contrast:\u003c\/strong\u003e It still provides a dramatic contrast boost, making it an ideal middle ground between a broadband UHC filter and a specialized imaging filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBetter for More Objects:\u003c\/strong\u003e The increased brightness makes it effective on a wider range of emission nebulae, not just the very brightest planetary nebulae.\u003c\/li\u003e\n\u003c\/ul\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 objects work best with the Optolong 18nm OIII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Optolong 18nm OIII filter excels on nebulae rich in ionized oxygen. It is most effective on \u003cstrong\u003eplanetary nebulae\u003c\/strong\u003e like the Ring Nebula (M57) and the Dumbbell Nebula (M27), and \u003cstrong\u003esupernova remnants\u003c\/strong\u003e such as the Veil Nebula complex (NGC 6960\/6992). It can also enhance portions of larger emission nebulae like the Lagoon Nebula (M8).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Optolong 18nm OIII filter make nebulae brighter from my city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, a narrowband filter cannot make an object intrinsically brighter. Its purpose is to \u003cstrong\u003eincrease contrast\u003c\/strong\u003e. It works by blocking over 99% of common light pollution sources, which makes the sky background appear much darker. This allows the faint light from the nebula to stand out more clearly, making it easier to see, but the nebula's actual brightness remains unchanged.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Optolong 18nm OIII filter improve my view of the Dumbbell Nebula (M27) in my 8\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8\" Dobsonian, the Optolong 18nm OIII filter will make a dramatic difference on M27, especially from suburban skies. The sky background will darken significantly, causing the nebula's classic \"apple core\" shape to pop with well-defined edges. You may also begin to see the fainter lobes and internal structures that are often lost in the skyglow without a filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 18nm OIII filter too aggressive for viewing the Orion Nebula (M42) with a 4\" refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a very bright object like the Orion Nebula (M42), an 18nm OIII filter is an excellent choice. While M42 is bright enough to see without a filter, the OIII filter will isolate the intricate, wispy details in the nebula's core and wings, revealing structure that is normally overwhelmed by the nebula's own brightness. The 18nm bandpass is wide enough that the view in a 4\" scope will remain bright and engaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose an 18nm OIII filter instead of a narrower 7nm version for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 18nm bandpass is specifically optimized for the human eye. Narrower filters, like 7nm or 3nm versions, are designed for CCD\/CMOS sensors and can produce an image that is too dim for satisfying visual use, particularly in smaller telescopes. The 18nm filter provides a powerful contrast boost while maintaining enough image brightness for a comfortable and detailed view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong 18nm OIII filter for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it is primarily designed for visual use, you can use the 18nm OIII for astrophotography, especially with one-shot color cameras from light-polluted areas. It provides a stronger signal and more natural star shapes than ultra-narrowband filters. However, for serious narrowband imaging from any location, a dedicated 7nm, 5nm, or 3nm OIII filter will provide higher contrast and better rejection of moonlight.\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\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e18nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral Wavelength\u003c\/td\u003e\n\u003ctd\u003e500nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Material\u003c\/td\u003e\n\u003ctd\u003eOptical Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAverage Transmission\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;80%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e400-700nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;99% of light pollution lines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Mounted, 2\" Mounted\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\"\u003eOptolong OIII 18nm Nebula Filter (Selected Size)\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\"\u003eProtective Plastic 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\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":52941926269213,"sku":"OPT-12701","price":111.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":52941926301981,"sku":"OPT-12702","price":151.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-narrowband-OIII-filter-is-designed-for-nebula-observation-allowing-18nm-bandwidth-of-light-centered-on-a-wavelength-of-500nm-through-1_d6a50468-3847-45e5-a0b6-0ecabb379087.jpg?v=1789592430"},{"product_id":"tele-vue-bandmate-oiii-filter","title":"Tele Vue BandMate OIII Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIsolates doubly ionized oxygen (OIII) emission lines\u003c\/li\u003e\n\u003cli\u003eDramatically increases contrast on planetary nebulae and supernova remnants\u003c\/li\u003e\n\u003cli\u003eManufactured by Astronomik in Germany for Tele Vue\u003c\/li\u003e\n\u003cli\u003eIndividually tested and serialized for optical quality\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" mounted formats\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\u003eTele Vue BandMate OIII Filter\u003c\/h2\u003e\n\u003cp\u003eAvailable in 1.25-inch and 2-inch formats, the Tele Vue BandMate OIII Filter isolates the critical OIII emission lines from planetary nebulae and supernova remnants, with each serialized filter undergoing rigorous German manufacturing and testing by Astronomik and Tele Vue to guarantee image integrity.\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\u003eOIII Narrowband: Isolating Planetary Nebulae and Supernova Remnants\u003c\/h3\u003e\n\u003cp\u003eThe BandMate OIII filter transmits a narrow band of light centered on the 501nm wavelengths emitted by doubly ionized oxygen. This is the dominant light produced by emission nebulae, particularly planetary nebulae and the delicate filaments of supernova remnants. By blocking nearly all other light, the filter dramatically darkens the sky background and boosts the contrast of these specific objects.\u003c\/p\u003e\n\u003cp\u003eTargets like the Dumbbell Nebula (M27), the Ring Nebula (M57), and the Veil Nebula (NGC 6960) transform from faint smudges into detailed structures. This filter is an essential tool for visual observers looking to pull the most detail out of these challenging deep-sky objects, especially from light-polluted locations.\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\u003eGerman-Made Optics with Rigorous Tele Vue Testing\u003c\/h3\u003e\n\u003cp\u003eTele Vue partners with Astronomik of Germany to produce the BandMate series, ensuring a level of quality control that exceeds industry standards. Each filter undergoes a multi-stage inspection process before it is approved for sale, guaranteeing that it will not degrade the pristine images produced by Tele Vue optics.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpectrographic Analysis:\u003c\/strong\u003e Astronomik tests each filter on a spectrograph to confirm the coating precisely matches its design specification for OIII transmission.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Power Optical Test:\u003c\/strong\u003e Tele Vue individually tests each filter at high power to ensure it introduces no image degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical \u0026amp; Cosmetic Inspection:\u003c\/strong\u003e Every filter is checked for proper threading and fit, and examined for cosmetic flaws like pinholes or sleeks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerialization:\u003c\/strong\u003e Each filter is serialized, providing a traceable record of its quality control passage.\u003c\/li\u003e\n\u003c\/ul\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\"\u003eHow will the Tele Vue BandMate OIII filter improve my view of the Veil Nebula (NGC 6960) in a 10\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a 10\" scope, the Tele Vue BandMate OIII will make the faint, filamentary structure of the Veil Nebula (NGC 6960) stand out dramatically against a much darker sky background. The filter isolates the specific light emitted by the nebula, revealing intricate details that are normally washed out by skyglow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Tele Vue BandMate OIII filter to see the Ring Nebula (M57) from my light-polluted suburban backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Tele Vue BandMate OIII filter is exceptionally effective in light-polluted conditions. It blocks the wavelengths associated with common streetlights and general skyglow, while selectively passing the light from the Ring Nebula (M57). This significantly increases contrast, making the nebula's shape and central star easier to observe even from suburban skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Tele Vue BandMate OIII different from other OIII filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary difference is the rigorous, dual-company quality control. Every Tele Vue BandMate OIII is made by \u003cstrong\u003eAstronomik in Germany\u003c\/strong\u003e and then independently tested by \u003cstrong\u003eTele Vue in the USA\u003c\/strong\u003e. This includes spectrographic analysis, high-power optical testing, and cosmetic inspection, with each filter being serialized. This is how Tele Vue keeps every BandMate filter consistent.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Tele Vue BandMate OIII filter useful for galaxies or star clusters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is not recommended for broadband targets like galaxies and star clusters. These objects emit light across the entire visible spectrum. The Tele Vue BandMate OIII will block most of that light, making these objects extremely dim or invisible. It is a specialized filter designed specifically for emission nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich size Tele Vue BandMate OIII filter, 1.25\" or 2\", should I choose?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose the size that matches your eyepieces. If you primarily use \u003cstrong\u003e1.25\" eyepieces\u003c\/strong\u003e for high-magnification views of planetary nebulae, the 1.25\" filter is ideal. If you use \u003cstrong\u003e2\" wide-field eyepieces\u003c\/strong\u003e to view large supernova remnants like the Veil Nebula, the 2\" filter is necessary to avoid vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWho manufactures the Tele Vue BandMate OIII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Tele Vue BandMate OIII filter is manufactured for Tele Vue by \u003cstrong\u003eAstronomik in Germany\u003c\/strong\u003e, a renowned producer of high-quality astronomical filters. All materials are sourced from Germany, and each filter is co-inspected by both companies.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNarrowband, OIII (doubly ionized oxygen)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" and 2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eAstronomik, Germany, for Tele Vue\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Targets\u003c\/td\u003e\n\u003ctd\u003ePlanetary nebulae, supernova remnants\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuality Control\u003c\/td\u003e\n\u003ctd\u003eOptical, spectrographic, mechanical and cosmetic testing; serialized\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\"\u003eTele Vue BandMate OIII Filter (1.25\" or 2\", as selected)\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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"2\" Mounted","offer_id":53005139443997,"sku":"TV-B2O-0200","price":364.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Mounted","offer_id":53005139476765,"sku":"TV-B2O-0125","price":200.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Tele-Vue-BandMate-OIII-Filter-1_fb5ca95c-903f-4c20-afb0-fa9f523adf06.jpg?v=1790041570"},{"product_id":"tele-vue-bandmate-h-beta-filter","title":"Tele Vue BandMate H-Beta Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFilter Type: Hydrogen-Beta (Hβ) Narrowband\u003c\/li\u003e\n\u003cli\u003eAvailable Sizes: 1.25\" and 2\" Mounted\u003c\/li\u003e\n\u003cli\u003ePrimary Targets: Horsehead Nebula, California Nebula\u003c\/li\u003e\n\u003cli\u003eManufacturing: Made in Germany by Astronomik for Tele Vue\u003c\/li\u003e\n\u003cli\u003eQuality Control: Individually serialized and spectrograph-tested\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\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\u003eTele Vue BandMate H-Beta Filter\u003c\/h2\u003e\n\u003cp\u003eAvailable in both 1.25\" and 2\" formats, the Tele Vue BandMate H-Beta Filter is a specialized narrowband filter manufactured by Astronomik in Germany to isolate the critical hydrogen-beta emission line. This filter is the key to observing notoriously difficult targets like the Horsehead Nebula (Barnard 33) and California Nebula (NGC 1499), which are very hard to see without it, even from a dark site.\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\u003eIsolating H-Beta: Unveiling the Horsehead \u0026amp; California Nebulae\u003c\/h3\u003e\n\u003cp\u003eThe H-Beta filter is a highly specialized tool designed for a single purpose: to pass the aqua-colored hydrogen-beta emission line common to a select few, but scientifically significant, nebulae. By aggressively blocking all other wavelengths, it dramatically increases the contrast of these faint objects, making them detectable.\u003c\/p\u003e\n\u003cp\u003eThis filter is particularly effective on large, diffuse targets that can fill the field of view of a wide-angle eyepiece. Unlike general-purpose \"light pollution\" filters, the H-Beta is an indispensable key for unlocking specific deep-sky challenges that are impossible without it.\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\u003eA Two-Stage, Serialized Inspection Standard\u003c\/h3\u003e\n\u003cp\u003eTo meet Tele Vue's stringent requirements, every BandMate filter undergoes a rigorous, multi-stage quality control process. Each filter is produced for Tele Vue by Astronomik in Germany, using German-sourced materials, and is individually serialized to track its inspection results.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpectrographic Test:\u003c\/strong\u003e Astronomik tests each filter on a spectrograph to guarantee the coating's transmission curve meets the precise H-Beta specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Test:\u003c\/strong\u003e Tele Vue performs a second, independent test at high power to ensure the filter introduces no degradation to the image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical \u0026amp; Cosmetic Inspection:\u003c\/strong\u003e Each filter is inspected for mechanical fit and cosmetic defects like pinholes or sleeks, ensuring flawless build quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eH-Beta vs. OIII: Targeting Different Nebulae\u003c\/h3\u003e\n\u003cp\u003eBeginning observers often wonder whether to start with an H-Beta or an OIII filter. While both are narrowband filters, they target completely different classes of celestial objects, making them complementary tools rather than competitors.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTele Vue H-Beta Filter:\u003c\/strong\u003e This is a specialist's filter for hydrogen-emitting targets. Its primary use is for the Horsehead Nebula, California Nebula, and a few others. It is not a general-purpose nebula filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOIII Filter:\u003c\/strong\u003e An Oxygen-III filter is more versatile, enhancing contrast on a much wider variety of objects, including most planetary nebulae like the Dumbbell Nebula (M27) and supernova remnants like the Veil Nebula (NGC 6960).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor most observers, an OIII filter is the better first choice. The H-Beta is the logical next step for those specifically seeking to conquer the famous, yet challenging, targets that require it.\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 makes the Tele Vue BandMate H-Beta filter essential for certain nebulae?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Tele Vue BandMate H-Beta filter isolates the specific 486nm wavelength of light emitted by ionized hydrogen. Objects like the \u003cstrong\u003eHorsehead Nebula\u003c\/strong\u003e and \u003cstrong\u003eCalifornia Nebula\u003c\/strong\u003e radiate strongly at this wavelength but are extremely faint visually. This filter darkens the sky background significantly, allowing the faint structure of these specific nebulae to become visible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Tele Vue H-Beta filter help me see the Horsehead Nebula (Barnard 33) from my suburban backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt helps, but a suburban sky makes it very hard. The Horsehead Nebula is famously difficult even from a dark site; the H-Beta filter provides the contrast that can make it detectable there, on a dark, moonless night. For best results, use it with a larger aperture telescope (8\" or more) and a low-power, wide-field eyepiece to frame the object against the brighter nebula IC 434.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a wide-angle 2\" eyepiece. Is the Tele Vue H-Beta filter effective for the California Nebula (NGC 1499)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The California Nebula is a very large object that requires a wide true field of view to see in its entirety. The Tele Vue H-Beta filter is designed to perform well even with wide-angle eyepieces, maintaining image quality across the field while providing the critical contrast needed to trace the nebula's faint outline.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Tele Vue H-Beta filter tested by both Astronomik and Tele Vue?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis dual-testing protocol ensures uncompromising quality. \u003cstrong\u003eAstronomik\u003c\/strong\u003e, the manufacturer, uses a spectrograph to verify that the filter's transmission curve is precisely centered on the H-Beta line. \u003cstrong\u003eTele Vue\u003c\/strong\u003e then conducts its own high-power optical tests to confirm the filter will not degrade the sharp images their eyepieces and telescopes produce. Each filter is also serialized for quality tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eShould I buy a Tele Vue H-Beta filter or an OIII filter first?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most observers, an \u003cstrong\u003eOIII filter\u003c\/strong\u003e is the better first choice as it enhances a much wider range of objects, particularly planetary nebulae and supernova remnants. The \u003cstrong\u003eH-Beta filter\u003c\/strong\u003e is a more specialized tool for a limited list of targets. It is an essential second filter for dedicated observers wanting to log challenging objects like the Horsehead Nebula.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Tele Vue BandMate H-Beta filter threaded for standard eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Tele Vue BandMate H-Beta filter is available in both 1.25\" and 2\" sizes, and each version is threaded to screw directly into the barrel of any standard eyepiece or accessory of the corresponding size.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNarrowband, Hydrogen-beta (Hβ)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" and 2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eAstronomik, Germany (for Tele Vue)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Targets\u003c\/td\u003e\n\u003ctd\u003eHorsehead Nebula, California Nebula, and other hydrogen-emitting nebulae\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuality Control\u003c\/td\u003e\n\u003ctd\u003eOptically, spectrographically, mechanically, and cosmetically tested\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerialization\u003c\/td\u003e\n\u003ctd\u003eYes, each filter is individually serialized\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\"\u003eTele Vue BandMate H-Beta Filter (1.25\" or 2\", as selected)\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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"2\" Mounted","offer_id":53005139542301,"sku":"TV-B2H-0200","price":364.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Mounted","offer_id":53005139575069,"sku":"TV-B2H-0125","price":200.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Tele-Vue-BandMate-H-Beta-Filter-1_386ced24-0148-45dd-875e-9c232743e6fb.jpg?v=1790041579"}],"url":"https:\/\/davidastro.com\/collections\/visual-filters.oembed?page=2","provider":"David Astro","version":"1.0","type":"link"}