{"title":"Filters","description":"\u003cdiv\u003e\n  \u003cp\u003e\n    A filter decides what light reaches your sensor or your eye, and under Canadian suburban skies that decision often matters more than aperture. The right narrowband filter can make a nebula imageable from a driveway that visually shows almost nothing. David Astro carries filters in Canada — narrowband, LRGB, light pollution, planetary, solar and scientific — in 1.25\", 2\", 31 mm, 36 mm and unmounted formats, shipped from Canadian stock.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    Filter selection is where our team spends a lot of time, because bandwidth, f-ratio and sensor size interact in ways that are not obvious from a product page. Tell us your telescope and camera and we will recommend a set that works together.\n  \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- more --\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eFilter Types and When Each One Earns Its Place\u003c\/h2\u003e\n  \u003cp\u003e\n    Filters do not add signal. They remove unwanted light so that the signal you want has better contrast against the background. Choosing well means knowing which unwanted light you are fighting.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/collections\/narrowband-filters\"\u003eNarrowband filters:\u003c\/a\u003e\u003c\/strong\u003e Ha, OIII and SII passbands, typically 3 to 12 nm. Narrower bands reject more light pollution and moonlight but demand accurate focus and longer exposures.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/collections\/lrgb-filters\"\u003eLRGB filter sets:\u003c\/a\u003e\u003c\/strong\u003e Parfocal luminance, red, green and blue for colour imaging with monochrome sensors, with the luminance channel carrying most of the detail.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/collections\/light-pollution-filters-1\"\u003eLight pollution filters:\u003c\/a\u003e\u003c\/strong\u003e Broadband rejection of mercury and sodium emission lines. Effective against older street lighting and much less effective against broad-spectrum LED.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/collections\/planetary-filters\"\u003ePlanetary and colour filters:\u003c\/a\u003e\u003c\/strong\u003e Wratten-standard colour filters that raise contrast on specific planetary features — a red or orange filter on Mars, blue on Jupiter's belts.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/collections\/white-light\"\u003eSolar filters:\u003c\/a\u003e\u003c\/strong\u003e Full-aperture white-light filters for safe observation of sunspots and transits.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/collections\/neutral-density-and-polarizing-filters\"\u003eNeutral density and polarizing:\u003c\/a\u003e\u003c\/strong\u003e Variable brightness reduction for lunar observing without altering colour balance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eWhy Choose David Astro for Filters\u003c\/h2\u003e\n  \u003cp\u003e\n    A filter that performs beautifully at f\/7 can produce a shifted passband and soft results at f\/3. That is the kind of detail worth asking about before ordering.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eF-ratio matched recommendations:\u003c\/strong\u003e Narrowband passbands shift blueward in fast optical systems, so we recommend filters specified for your focal ratio rather than the narrowest available.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSensor size and vignetting:\u003c\/strong\u003e We size filters to your sensor diagonal and filter wheel placement, so an undersized filter does not clip your corners.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSpacing accounted for:\u003c\/strong\u003e Filter glass shifts focus by roughly a third of its thickness, and we include that in the back-focus calculation we provide.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAuthorized dealer:\u003c\/strong\u003e Genuine filters with full manufacturer warranty and verified coatings, in Canadian inventory and shipped domestically.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eShips from Canada:\u003c\/strong\u003e No duties or brokerage charges for Canadian buyers.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eFilters in Canada — Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003e\u003cstrong\u003eDo light pollution filters still work under LED streetlights?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eMuch less well than they did under sodium lighting. LED emits across a broad spectrum, so there is no narrow band to reject. Narrowband filters remain effective because they pass only emission lines regardless of what the streetlight does.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eHow narrow should my Ha filter be?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eFor f\/5 and slower, 3 to 5 nm gives excellent contrast. Below about f\/4, the incident light cone shifts the passband and a 6 to 7 nm filter, or one specified for fast optics, performs better.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eWhat size filters do I need?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eMatch the sensor diagonal plus the distance from filter to sensor. A 36 mm filter typically covers APS-C in a standard wheel; full frame usually needs 50 mm square or unmounted 2 inch.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eAre filters shipped from Canada?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eYes, in-stock filters are held in our Canadian warehouse and reach Canadian customers without customs handling.\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eBuilding a filter set?\u003c\/h2\u003e\n  \u003cp\u003eTell us your telescope, camera and sky conditions and we will recommend the right bandwidths and sizes. Canadian stock, fast domestic shipping.\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-uhc-lpr-filter-1-25","title":"Celestron UHC\/LPR Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSelectively blocks mercury vapor, sodium vapor, and natural sky glow\u003c\/li\u003e\n\u003cli\u003eAchieves over 97% transmission of critical nebula emission lines\u003c\/li\u003e\n\u003cli\u003eFeatures a moderate 60nm passband for natural views with high contrast\u003c\/li\u003e\n\u003cli\u003eEfficient H-Alpha passband at 656nm for astrophotography\u003c\/li\u003e\n\u003cli\u003eSized for standard 1.25\" 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\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 UHC\/LPR Filter - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron UHC\/LPR Filter for 1.25\" eyepieces delivers a dramatic increase in contrast by achieving over 97% transmission of key nebula wavelengths while suppressing common light pollution. Its 60nm passband provides a significant boost for telescopes in the 4\" to 11\" aperture range, darkening the sky without eliminating background star fields. This filter also includes an efficient H-Alpha passband at 656nm, making it a valuable tool for both visual observers and 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\u003eBlocking Unwanted Light with \u0026gt;97% Transmission\u003c\/h3\u003e\n\u003cp\u003eThis Ultra High Contrast (UHC) filter is engineered to isolate and reject specific wavelengths associated with urban skyglow—primarily from mercury and sodium-vapor streetlights—and the neutral oxygen that causes natural sky glow. While aggressively blocking these sources, the advanced multi-layer dielectric coatings allow more than 97% of the light from emission nebulae to pass through. The result is a significantly darker background sky, making faint structures in objects like the Orion Nebula (M42) or Lagoon Nebula (M8) 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\u003eIonbeam-Hardened Durability for 1.25\" Barrels\u003c\/h3\u003e\n\u003cp\u003eCelestron employs plasma-assisted, Ionbeam-hardened coatings on the UHC\/LPR filter, creating an optical surface that is highly resistant to scratching and degradation from cleaning and environmental exposure. This modern coating technology ensures the filter's high transmission and sharp cutoffs are maintained for years of use. The precisely machined 1.25\" aluminum cell threads smoothly onto standard eyepieces, diagonals, and camera nosepieces without binding.\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 60nm Passband Optimized for Nebulae\u003c\/h3\u003e\n\u003cp\u003eThe filter's 60nm passband strikes a critical balance, offering a major contrast enhancement while maintaining a more natural-feeling view compared to ultra-narrowband filters. This moderate bandwidth allows enough of the stellar continuum through to keep star fields rich, which is especially appreciated by users of 4\" to 11\" telescopes. For imagers, the inclusion of the critical 656nm H-Alpha line means you can capture vital hydrogen-alpha data without needing a separate, dedicated filter.\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 will the Celestron UHC\/LPR 1.25\" filter improve my view of the Orion Nebula (M42) from the city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFrom a light-polluted location, the Celestron UHC\/LPR filter will dramatically darken the greyish background sky, increasing the contrast between the nebula and its surroundings. This allows you to see fainter, extended structures in M42's outer wings and resolve more detail within the bright core of the Trapezium that would otherwise be washed out by city lights.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this 1.25\" filter a good choice for my 8\" Schmidt-Cassegrain telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. Telescopes in the 4\" to 11\" range benefit significantly from this filter. On an 8\" SCT, the UHC\/LPR filter will provide a substantial contrast boost on emission and planetary nebulae without making the image too dim, preserving the brightness advantage of your telescope's aperture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between this Celestron UHC\/LPR filter and a broadband filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA UHC (Ultra High Contrast) filter like this one has a narrower passband (around 60nm) than a typical broadband or \"minus-violet\" filter. It more aggressively targets specific light pollution lines, resulting in a darker sky background and noticeably higher contrast on emission nebulae. Broadband filters offer a more subtle effect with a more natural color balance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Celestron UHC\/LPR filter for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this filter is designed for both visual and imaging use. Its key advantage for imagers is the inclusion of an efficient H-Alpha passband at 656nm, allowing you to capture crucial red nebulosity with a color camera in a single shot, which many LPR filters block.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this filter help me see galaxies better?\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 are broadband objects, meaning they emit light across the entire visible spectrum. A UHC\/LPR filter works by blocking parts of that spectrum, which will dim the view of the galaxy as much as it dims the light pollution. It is designed specifically for emission nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat specific types of artificial light does the UHC\/LPR filter block?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter is designed to combat the most common sources of urban light pollution. This includes \u003cstrong\u003emercury vapor lights\u003c\/strong\u003e, \u003cstrong\u003ehigh-pressure sodium vapor lights\u003c\/strong\u003e, and \u003cstrong\u003elow-pressure sodium vapor lights\u003c\/strong\u003e. It also reduces the effects of natural \u003cstrong\u003esky glow\u003c\/strong\u003e caused by neutral oxygen emission.\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\u003eUHC\/LPR (Ultra High Contrast \/ Light Pollution Reduction)\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\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;97%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePassband\u003c\/td\u003e\n\u003ctd\u003e60nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH-Alpha Passband\u003c\/td\u003e\n\u003ctd\u003e656nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eMulti-layer dielectric, plasma assisted, Ionbeam hardened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Aperture\u003c\/td\u003e\n\u003ctd\u003e4\" - 11\" (102mm - 280mm)\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\u003cimg class=\"DAV-img-box\" alt=\"Celestron UHC\/LPR Filter - 1.25\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/F7424-A_uhc_lpr_filter_125_1.jpg?v=1680126759\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eUHC\/LPR 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=\"Protective case for 1.25-inch filter\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/zwo-1-25-inch-filter-case.jpg?v=1782035905\"\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":44967149404445,"sku":"CEL-94123","price":132.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-UHC-LPR-Filter-1-25-in-94123-1__39582.1594230266.1280.1280.jpg?v=1684337240"},{"product_id":"celestron-uhc-lpr-filter-2","title":"Celestron UHC\/LPR Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSelectively blocks light pollution from mercury and sodium vapor lights\u003c\/li\u003e\n\u003cli\u003eAchieves over 97% light transmission for maximum brightness\u003c\/li\u003e\n\u003cli\u003e60nm bandpass enhances nebula contrast while maintaining natural star fields\u003c\/li\u003e\n\u003cli\u003eOptimized for 2\" focusers and accessories\u003c\/li\u003e\n\u003cli\u003eIonbeam-hardened coatings for scratch resistance and durability\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 UHC\/LPR Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron UHC\/LPR Filter for 2\" eyepieces dramatically increases contrast by selectively blocking artificial light pollution and natural sky glow, achieving over 97% transmission of critical nebula wavelengths within its 60nm passband. Optimized for telescopes from 4\" to 11\" in aperture, it darkens the sky background and includes a specific passband for the 656nm H-Alpha line, making faint emission structures visible from the city or deep-sky sites.\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\u003eBlocking Key Light Pollution Lines in 4\" to 11\" Telescopes\u003c\/h3\u003e\n\u003cp\u003eThis Ultra High Contrast (UHC) filter is engineered to reject the specific wavelengths produced by mercury vapor, high and low-pressure sodium vapor lights, and the neutral oxygen emission that causes natural sky glow. By eliminating this unwanted light, the background sky appears significantly darker, allowing the faint light from emission nebulae to stand out. This targeted rejection is effective in telescopes from 4\" to 11\" in aperture, where maximizing every photon is critical.\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 60nm Passband Delivering \u0026gt;97% Peak Transmission\u003c\/h3\u003e\n\u003cp\u003eThe filter's design centers on a moderately wide 60nm passband, which allows it to boost nebula contrast without sacrificing a natural-looking star field. Within this window, advanced multi-layer dielectric coatings achieve a peak transmission of over 97%. This high efficiency ensures that views remain bright and detailed, preventing the dimming effect that can occur with less advanced filters and making it an ideal choice for smaller 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\u003eHardened Coatings and a 656nm H-Alpha Passband for Imagers\u003c\/h3\u003e\n\u003cp\u003eCelestron utilizes plasma-assisted and Ionbeam-hardened coatings, creating a durable, scratch-resistant surface that withstands regular use and cleaning. For astrophotographers, the filter's design is especially valuable as it includes an efficient passband for the critical H-Alpha emission line at 656nm. This allows DSLR and color camera users to capture the deep reds of hydrogen-rich nebulae that are often lost in city 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\u003eUHC\/LPR vs. Standard Broadband Filters: A Clear Contrast Advantage\u003c\/h3\u003e\n\u003cp\u003eCompared to a typical broadband Light Pollution Reduction (LPR) filter, the Celestron UHC\/LPR provides a noticeable improvement in contrast on emission and planetary nebulae. While a broadband filter offers a more general reduction of light pollution, the UHC design more aggressively targets specific nuisance wavelengths.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSky Background:\u003c\/strong\u003e The sky view through the UHC\/LPR is significantly darker, making it easier to detect the faint, extended structures of objects like the Veil Nebula (NGC 6960).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNebula Detail:\u003c\/strong\u003e Emission nebulae appear more defined and \"pop\" from the background, revealing subtle shadings and structures that are washed out with a less selective filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural View:\u003c\/strong\u003e The 60nm passband is wide enough to maintain relatively natural star colors, avoiding the heavy color cast associated with extremely narrow \"line\" filters.\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 difference between this Celestron UHC\/LPR and a standard broadband filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Celestron \u003cstrong\u003eUHC\/LPR (Ultra High Contrast\/Light Pollution Reduction)\u003c\/strong\u003e filter has a narrower passband (around 60nm) that more aggressively isolates the key wavelengths from emission nebulae while strongly rejecting light pollution. A standard broadband filter has a wider passband, resulting in a brighter but lower-contrast image. The UHC design produces a darker sky background and makes nebulae 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 Celestron UHC\/LPR filter only for viewing nebulae?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile its primary purpose is to enhance emission, planetary, and reflection nebulae, it is not strictly limited to them. The filter can help darken the sky background and improve contrast on any deep-sky object, though the effect will be most dramatic on nebulae. It is not recommended for viewing galaxies or star clusters, as it will dim these objects without providing a significant contrast benefit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this filter help me see the Orion Nebula (M42) from my suburban backyard with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. An 8\" SCT is an excellent instrument for this filter. The Celestron UHC\/LPR will significantly darken the washed-out suburban sky, dramatically improving the contrast of the Orion Nebula (M42). You will be able to see more of the faint, extended nebulosity and potentially resolve more detail within the Trapezium region.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a 6\" Newtonian at a dark sky site. Is the Celestron UHC\/LPR filter still useful?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, even at a dark sky site, this filter is very effective. It works by blocking natural sky glow in addition to artificial light pollution. By using the filter on objects like the Lagoon Nebula (M8) or the Swan Nebula (M17), you will see a noticeable increase in contrast, making the nebulosity appear more detailed and defined against the blackness of space.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Celestron 2\" UHC\/LPR filter suitable for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is well-suited for imaging with color cameras like DSLRs or dedicated astronomy cameras. The filter's broader 60nm bandpass retains good star color, and its efficient transmission of the H-Alpha wavelength at 656nm is crucial for capturing the red emission regions in many popular deep-sky targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach and use the 2\" UHC\/LPR filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Celestron 2\" UHC\/LPR filter has standard 2\" filter threads (M48x0.75). It can be threaded directly onto the barrel of any 2\" eyepiece or onto a 2\" nosepiece for a camera. Simply screw it on until it is finger-tight and insert the eyepiece or camera into your telescope's focuser as usual.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eUHC\/LPR (Ultra High Contrast \/ Light Pollution Reduction)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;97%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePassband\u003c\/td\u003e\n\u003ctd\u003e60nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH-Alpha Passband\u003c\/td\u003e\n\u003ctd\u003e656nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eMulti-layer dielectric, Ionbeam hardened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Telescopes\u003c\/td\u003e\n\u003ctd\u003e4\" - 11\" aperture\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 UHC\/LPR Filter - 2\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/celestron-uhc-lpr-filter-2.jpg?v=1782200231\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eUHC\/LPR 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\u003cimg class=\"DAV-img-box\" alt=\"Protective Plastic Case for 2-inch Filter\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/2-inch-filter-case.jpg?v=1782200231\"\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 Celestron 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\u003cp\u003eThis product is covered by Celestron's 2-Year Limited Warranty. For more details, please visit the \u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron Warranty Policy\u003c\/a\u003e page.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967149437213,"sku":"CEL-94124","price":174.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-UHC-LPR-Filter-2-in-94124-1__66083.1594230267.1280.1280.jpg?v=1684337242"},{"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-cls-1-25","title":"Explore Scientific Nebula Filter CLS - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCity Light Suppression (CLS) Filter\u003c\/li\u003e\n\u003cli\u003eEnhances Contrast for Deep-Sky Objects\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" Sizes\u003c\/li\u003e\n\u003cli\u003eIdeal for Viewing Nebulae and Galaxies\u003c\/li\u003e\n\u003cli\u003eThreads Directly into Standard Eyepieces\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 CLS - 1.25\" \u0026amp; 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific Nebula Filter CLS, available in standard 1.25\" and 2\" formats, is a general-purpose light pollution filter engineered to darken the sky background and significantly increase contrast on a wide range of deep-sky objects.\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\u003eBroadband Contrast Enhancement for Urban Skies\u003c\/h3\u003e\n\u003cp\u003eThis City Light Suppression (CLS) filter works by selectively blocking common wavelengths of artificial lighting, such as sodium and mercury vapor streetlights, which are the primary cause of urban skyglow. By rejecting this unwanted light while transmitting the key wavelengths emitted by deep-sky objects, the filter provides a dramatically darker sky background. This isolates faint nebulae and galaxies from the washed-out backdrop, making them easier to detect and observe.\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 General-Purpose Filter for Nebulae and Galaxies\u003c\/h3\u003e\n\u003cp\u003eUnlike narrowband filters that target specific emission lines, the CLS is a broadband filter designed for versatility. It improves the view of all types of deep-sky objects, including emission nebulae like the Orion Nebula (M42), reflection nebulae, and even broadband targets like the Andromeda Galaxy (M31). This makes the Explore Scientific CLS an excellent first filter for an observer looking for a single, effective tool to combat light pollution across the celestial catalog.\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 Explore Scientific CLS filter improve views from a suburban backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific CLS filter darkens the sky background by blocking the most common wavelengths of light pollution from streetlights. This increases the contrast between your target object and the sky, making faint details in nebulae and galaxies more visible, even from moderately light-polluted areas.\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 Explore Scientific CLS and a UHC filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003eCLS (City Light Suppression)\u003c\/strong\u003e filter is a broadband filter, meaning it passes a wider range of light, making it effective on galaxies and star clusters in addition to nebulae. A \u003cstrong\u003eUHC (Ultra High Contrast)\u003c\/strong\u003e filter is a narrowband filter that passes a much smaller range of light, primarily the OIII and H-beta lines from emission nebulae. A UHC provides higher contrast on those specific targets but is less effective for broadband sources like galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Explore Scientific CLS filter for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the CLS filter is a popular choice for beginner to intermediate astrophotographers using color cameras (DSLR, Mirrorless, or One-Shot-Color astro cameras). It helps capture better data from light-polluted locations by reducing skyglow, leading to improved contrast and color balance in the final image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific CLS filter help me see the Orion Nebula (M42) with my 8\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The Orion Nebula (M42) is a bright emission nebula that responds extremely well to a CLS filter. With an 8\" telescope, the filter will darken the surrounding sky significantly, making the faint, extended wings of the nebula pop into view and revealing more structure within the bright core.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Explore Scientific CLS filter affect views of the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Andromeda Galaxy (M31) is a broadband target, meaning it emits light across the entire visible spectrum. The Explore Scientific CLS filter will help by dimming the skyglow around the galaxy, which can make its faint outer arms easier to trace. While it will slightly dim the galaxy itself, the contrast enhancement often results in a more detailed overall view, especially of the dust lanes near the core.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Explore Scientific CLS filter thread into all standard 1.25\" and 2\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Both the 1.25\" and 2\" versions of the Explore Scientific CLS filter feature standard filter threads. They are designed to screw directly into the barrel of any corresponding 1.25\" or 2\" eyepiece or accessory, such as a filter wheel or camera nosepiece.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257017195\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\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":"1.25\"","offer_id":44967202554141,"sku":"ES-310225","price":153.99,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":44967202586909,"sku":"ES-310220-1","price":168.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-Nebula-Filter-CLS-1-25-inch-310225-1__83920.1594240362.1280.1280.jpg?v=1684338886"},{"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":"qhyccd-cfw3","title":"QHYCCD CFW3","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMultiple carousel options for 1.25\", 36mm, 2\", and 50mm filters\u003c\/li\u003e\n\u003cli\u003eDirect-drive motor with shortest-path seeking logic\u003c\/li\u003e\n\u003cli\u003eThin body profile enables use with camera lenses\u003c\/li\u003e\n\u003cli\u003eTricolor LED for visual confirmation of filter position\u003c\/li\u003e\n\u003cli\u003eThreaded 12V DC power port for secure connections\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\u003eQHYCCD CFW3 Motorized Filter Wheel\u003c\/h2\u003e\n\u003cp\u003eThe QHYCCD CFW3 series offers robust filter management in 8 different configurations, supporting carousels for filters ranging from 7-position 1.25-inch to 9-position 2-inch formats. Powered by a 12-volt direct-drive motor, the CFW3 uses bidirectional, shortest-path logic to minimize filter change time during automated LRGB or narrowband imaging sequences.\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\u003eShortest-Path Logic: Faster Changes with a 12V Direct-Drive Motor\u003c\/h3\u003e\n\u003cp\u003eUnlike conventional filter wheels that must rotate fully to cycle through positions, the QHYCFW3's motor drive is bidirectional. When you command a filter change, the wheel intelligently calculates the shortest path—clockwise or counter-clockwise—to reach the target filter. This small optimization saves significant time over the course of an imaging session, especially during automated sequences that frequently switch between filters.\u003c\/p\u003e\n\u003cp\u003ePower is supplied via a 12V DC input located on the backplate. The port is threaded to mate securely with compatible power cables, preventing accidental disconnection that could interrupt an exposure or damage equipment.\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\u003e8 Carousel Options: Integrate 1.25\" to 2\" Filters with Camera Lenses\u003c\/h3\u003e\n\u003cp\u003eThe QHYCFW3 is available in multiple \"thin\" and \"standard\" body configurations, with 8 distinct carousel options available for filters from 1.25\" mounted to 50mm unmounted. The thin profile is specifically designed to preserve critical back focus, making it possible to pair the filter wheel with QHY COLDMOS cameras and optional Canon or Nikon lens adapters. This combination lets you shoot wide-field, filtered images through high-quality camera lenses—a capability often impossible with thicker filter wheels.\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\u003eTricolor LED: At-a-Glance Confirmation of up to 9 Filter Positions\u003c\/h3\u003e\n\u003cp\u003eTo provide clear, immediate feedback on the wheel's status, the QHYCFW3 incorporates a tricolor LED indicator. The LED assigns a unique color or color combination to each of the filter positions, with carousels supporting up to 9 filters. This allows you to visually confirm that the wheel has moved to the correct position without having to check your control software, giving you confidence that your imaging plan is proceeding as expected.\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 QHYCFW3 save time compared to other filter wheels?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eQHYCFW3\u003c\/strong\u003e uses a direct-drive motor with \u003cstrong\u003eshortest-path logic\u003c\/strong\u003e. Instead of only rotating in one direction, it can move clockwise or counter-clockwise to reach the next filter in the fewest steps. For example, moving from position 7 back to 1 is a single step, not a full seven-step rotation, saving valuable time during automated imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the different colors on the QHYCFW3's LED mean?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tricolor LED on the \u003cstrong\u003eQHYCFW3\u003c\/strong\u003e assigns a unique color or combination of colors to each filter slot in the carousel. This provides instant visual confirmation of the active filter position without needing to consult your software, which is useful for verifying your sequence is running correctly in the dark.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the QHYCFW3 with a Canon or Nikon camera lens for wide-field imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \"thin\" models of the \u003cstrong\u003eQHYCFW3\u003c\/strong\u003e are specifically designed with a minimal profile. This short optical path, when combined with the short back focus of QHY COLDMOS cameras, allows you to install optional lens adapters and achieve focus with Canon or Nikon lenses for wide-field filtered astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat power supply does the QHYCFW3 require?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eQHYCFW3\u003c\/strong\u003e operates on \u003cstrong\u003e12V DC power\u003c\/strong\u003e. It features a threaded power port on the backplate to ensure a secure connection that won't accidentally pull out during an imaging session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich QHYCFW3 model should I choose for my QHY268M camera with 36mm unmounted filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor that combination, you would select the \u003cstrong\u003eQHYCFW3M-US\u003c\/strong\u003e model. It is a \"thin\" version designed to hold seven 36mm unmounted filters, which is a perfect match for the sensor size and filter requirements of the QHY268M monochrome camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I know which QHYCFW3 model I am buying?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eQHYCFW3\u003c\/strong\u003e is sold in 8 different versions. Please check the product title and selection on the page to ensure you are purchasing the correct model for your filter size (1.25\", 36mm, 2\", or 50mm) and capacity needs (5, 7, or 9 positions).\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 Configurations\u003c\/td\u003e\n\u003ctd\u003eQHYCFW3S-US (Thin) 7 x 1.25\", QHYCFW3S-SR (Standard) 7 x 1.25\", QHYCFW3M-US (Thin) 7 x 36mm, QHYCFW3M-US (Thin) 5 x 2\", QHYCFW3L 7 x 2\", QHYCFW3XL 9 x 2\", QHYCFW3M-SR (Standard) 5 x 2\", QHYCFW3M-SR (Standard) 5 x 50mm\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\"\u003eContents may vary depending on the specific model configuration selected.\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.qhyccd.com\/download\/\" 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\n\u003ca href=\"https:\/\/davidastro.com\/pages\/qhyccd-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eQHYCCD Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"QHYCCD","offers":[{"title":"QHYCFW3S-US (Thin) 7 x 1.25\"","offer_id":44967211663645,"sku":"QHY-110040","price":391.0,"currency_code":"CAD","in_stock":true},{"title":"QHYCFW3S-SR (Standard) 7 x 1.25\"","offer_id":44967211696413,"sku":"QHY-110038","price":391.0,"currency_code":"CAD","in_stock":true},{"title":"QHYCFW3M-US (Thin) 7 x 36mm","offer_id":44967211729181,"sku":"QHY-110045","price":489.0,"currency_code":"CAD","in_stock":true},{"title":"QHYCFW3M-US (Thin) 5 x 2\"","offer_id":49560224039197,"sku":"QHY-110045-5x2","price":489.0,"currency_code":"CAD","in_stock":true},{"title":"QHYCFW3L 7 x 2\"","offer_id":44967211761949,"sku":"QHY-110047","price":867.0,"currency_code":"CAD","in_stock":true},{"title":"QHYCFW3XL 9 x 2\"","offer_id":44967211794717,"sku":"QHY-110048-9x2","price":1679.0,"currency_code":"CAD","in_stock":true},{"title":"QHYCFW3M-SR (Standard) 5 x 2\"","offer_id":44967211827485,"sku":"QHY-110041-5x2","price":489.0,"currency_code":"CAD","in_stock":true},{"title":"QHYCFW3M-SR (Standard) 5 x 50mm","offer_id":44967211893021,"sku":"QHY-110041-5x50","price":489.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/QHYCCD-CFW3-1__46276.1595653760.1280.1280.jpg?v=1684339028"},{"product_id":"william-optics-stc-astro-duo-narrowband-filter","title":"William Optics STC Astro Duo-Narrowband Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual-Bandpass for H-Alpha and Oxygen-III\u003c\/li\u003e\n\u003cli\u003eSuppresses Urban Light Pollution\u003c\/li\u003e\n\u003cli\u003eIon Beam-Assisted Deposition (IBAD) Coatings\u003c\/li\u003e\n\u003cli\u003eHigh Durability and Easy-to-Clean Optical Surfaces\u003c\/li\u003e\n\u003cli\u003eMatte Black Anodized, Teflon-Coated Anti-Flare 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\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\u003eWilliam Optics STC Astro Duo-Narrowband Filter\u003c\/h2\u003e\n\u003cp\u003eThe William Optics STC Astro Duo-Narrowband Filter is engineered to isolate the two most important emission lines for nebula photography, Hydrogen-alpha (Hα) and Oxygen-III (OIII), while aggressively blocking light pollution. By utilizing advanced Ion Beam-Assisted Deposition (IBAD) coatings, this filter delivers exceptional signal-to-noise ratio and maintains spectral stability through changing temperatures, ensuring consistent results from your light-polluted 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\u003eThe Duo-Narrowband Advantage: Isolating Hα and OIII Emission Lines\u003c\/h3\u003e\n\u003cp\u003eUnlike broadband filters that pass a wide swath of the spectrum, the STC Astro Duo-Narrowband Filter targets the specific wavelengths emitted by planetary and emission nebulae. This selective transmission dramatically increases contrast by rejecting sodium and mercury vapor light from city streetlights, as well as natural skyglow, darkening the background and making faint nebulosity stand out.\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\u003eIBAD Coatings: Durability and Spectral Stability\u003c\/h3\u003e\n\u003cp\u003eThe filter employs Ion Beam-Assisted Deposition (IBAD) coating technology, which creates an extremely dense, hard, and moisture-resistant optical surface. This process ensures the filter's bandpass characteristics will not shift due to changes in temperature or humidity during an imaging session—a critical factor for maintaining consistent color balance and data quality. The robust coatings also make the filter surface easier to clean without risk of 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\u003eEngineered Frame: Anti-Reflection and Easy Handling\u003c\/h3\u003e\n\u003cp\u003eEvery component is designed to minimize artifacts. The filter's frame is constructed from matte black anodized aluminum to absorb stray light and prevent internal reflections that can cause halos around bright stars. A Teflon coating on the frame's edge ensures smooth installation and removal from a filter wheel or camera nosepiece, reducing the risk of binding or cross-threading.\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\u003eDuo-Narrowband vs. Broadband LPR Filters: A Sharper Cut\u003c\/h3\u003e\n\u003cp\u003eWhile a standard Light Pollution Reduction (LPR) filter offers a modest improvement from the city, a duo-narrowband design like the STC represents a significant step up for imaging emission nebulae. Where a broadband LPR filter might pass a wide range of blue and red light, the STC filter's tight focus on just the Hα and OIII lines provides a much darker sky background. This makes it the superior choice for objects like the Orion Nebula (M42) or the Lagoon Nebula (M8), though less ideal for broadband targets like galaxies and reflection nebulae which emit light across the entire spectrum.\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 advantage of the William Optics STC Astro Duo-Narrowband Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary advantage is isolating the key \u003cstrong\u003eH-alpha\u003c\/strong\u003e and \u003cstrong\u003eOIII\u003c\/strong\u003e wavelengths emitted by most nebulae. This allows you to capture high-contrast images from light-polluted urban and suburban locations by rejecting the specific wavelengths associated with artificial lighting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the STC Duo-Narrowband 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\u003eIt will perform exceptionally well. The Orion Nebula (M42) is rich in both Hydrogen-alpha and Oxygen-III emissions. The William Optics STC Astro Duo-Narrowband Filter will darken the light-polluted sky background, dramatically increasing the contrast and revealing faint, extended structures in the nebula that would otherwise be invisible from a city.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the STC Duo-Narrowband Filter suitable for imaging galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is not the ideal filter for broadband targets like galaxies. Galaxies and reflection nebulae shine by reflecting starlight across the entire visible spectrum. Because the \u003cstrong\u003eWilliam Optics STC Astro Duo-Narrowband Filter\u003c\/strong\u003e blocks most of that spectrum, it will significantly dim the galaxy and produce poor results. A broadband LPR filter or unfiltered imaging from a dark site is better for galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the IBAD coating on the STC Duo-Narrowband Filter improve my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eIon Beam-Assisted Deposition (IBAD)\u003c\/strong\u003e process creates a very stable coating. This prevents the filter's transmission bands from shifting with temperature or humidity changes throughout the night. This stability ensures you get consistent color data and performance from dusk till dawn, a crucial factor for long-exposure astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the frame of the STC Duo-Narrowband Filter special?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe frame is designed to enhance image quality and usability. It features:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatte Black Anodizing:\u003c\/strong\u003e Absorbs stray light to prevent internal reflections and halos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTeflon Coating:\u003c\/strong\u003e Allows for smooth, easy installation and removal from your imaging train without jamming.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the William Optics STC Duo-Narrowband Filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile technically possible, it is not recommended. Narrowband filters like this one block a tremendous amount of light, and the resulting image through an eyepiece would be extremely dim. These filters are designed specifically for the long exposures used in astrophotography with one-shot-color or monochrome cameras.\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\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967225590045,"sku":"WO-YF-STC-ADN","price":660.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-STC-Astro-Duo-Narrowband-Filter-YF-STC-ADN-1__15183.1596133266.1280.1280.jpg?v=1684339179"},{"product_id":"william-optics-stc-ultra-layer-astro-multispectra-filter-48mm","title":"William Optics STC Ultra Layer Astro Multispectra Filter - 48mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e48mm (M48) Filter Size\u003c\/li\u003e\n\u003cli\u003eMulti-Bandpass Light Pollution Suppression\u003c\/li\u003e\n\u003cli\u003ePasses H-α, H-β, and OIII Emission Lines\u003c\/li\u003e\n\u003cli\u003eSchott B270 Optical Glass Substrate\u003c\/li\u003e\n\u003cli\u003eSTC Ultra-Layer IBAD Anti-Reflection 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\u003eWilliam Optics STC Ultra Layer Astro Multispectra Filter - 48mm\u003c\/h2\u003e\n\u003cp\u003eThe 48mm William Optics STC Ultra Layer Astro Multispectra Filter is engineered to restore natural color and contrast to astrophotography by suppressing common mercury, sodium, and LED light pollution while transmitting crucial H-alpha, H-beta, and OIII nebula lines through its coated Schott B270 optical 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\u003eRestoring Natural Color from Light-Polluted Skies\u003c\/h3\u003e\n\u003cp\u003eThis filter is designed as a direct response to the challenge of urban and suburban imaging. It isolates and blocks the most common sources of artificial skyglow—specifically mercury vapor, high-pressure sodium, and certain disruptive LED frequencies—that wash out faint deep-sky objects.\u003c\/p\u003e\n\u003cp\u003eBy removing the offending wavelengths, the STC Astro Multispectra filter darkens the sky background significantly. This allows you to use longer exposures from compromised locations, revealing faint nebulosity and galactic structure while preserving a natural color balance in stars and surrounding fields.\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 Imaging of H-α, H-β, and OIII Targets\u003c\/h3\u003e\n\u003cp\u003eWhile aggressively filtering light pollution, the STC Astro Multispectra preserves the most important wavelengths for astrophotography. The filter's bandpass is tailored to transmit the deep red of Hydrogen-alpha, the teal of Oxygen-III, and the blue-green of Hydrogen-beta with high efficiency.\u003c\/p\u003e\n\u003cp\u003eThis selective transmission dramatically increases the contrast between emission nebulae and the background sky. Objects like the North American Nebula (NGC 7000) or the Orion Nebula (M42) stand out with enhanced structure and saturation, producing images with greater depth and clarity even from a backyard observatory.\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 B270 Glass and Ion Beam Assisted Coatings\u003c\/h3\u003e\n\u003cp\u003eThe filter's optical foundation is premium Schott B270 glass, known for its clarity and homogeneity. This ensures that the filter imparts no degradation to your imaging system's resolution. Each surface is treated with STC’s proprietary Ultra Layer coatings applied via Ion Beam Assisted Deposition (IBAD).\u003c\/p\u003e\n\u003cp\u003eThis advanced coating process results in an exceptionally hard, durable, and environmentally stable surface that resists moisture and is easier to clean. The multi-layer coatings are also optimized to minimize reflections and prevent the halos around bright stars that can plague inferior filters, ensuring maximum light transmission of the desired wavelengths.\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 kind of light pollution does the WO STC Astro Multispectra filter block?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter is designed to suppress the most common sources of urban light pollution, including \u003cstrong\u003emercury vapor lamps\u003c\/strong\u003e, \u003cstrong\u003ehigh and low-pressure sodium vapor lamps\u003c\/strong\u003e, and certain wavelengths of \u003cstrong\u003eLED lighting\u003c\/strong\u003e that cause skyglow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 48mm STC Astro Multispectra filter good for imaging galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is very effective for broadband targets like galaxies. By reducing skyglow, the filter increases the contrast between the galaxy's faint outer arms and the night sky. Unlike narrowband filters, it preserves the natural star colors in the galaxy's halo and core, making it an excellent choice for imaging M31 from suburban locations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the STC Astro Multispectra filter affect star color compared to a UHC filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe STC Astro Multispectra is designed to produce more \u003cstrong\u003enatural star colors\u003c\/strong\u003e. While a traditional UHC (Ultra High Contrast) filter creates very high contrast on nebulae, it often does so at the cost of a strong blue-green color cast. This filter uses a multi-bandpass approach to let more of the stellar continuum through, resulting in a more balanced and photographically neutral image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the STC Astro Multispectra 48mm filter with a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003e48mm (or 2-inch) filter size\u003c\/strong\u003e is ideal for use with full-frame DSLR or dedicated astronomy cameras. The large format prevents vignetting, ensuring the sensor is evenly illuminated from corner to corner, which is critical for wide-field astrophotography and Milky Way landscapes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the IBAD coatings on this filter special?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eIon Beam Assisted Deposition (IBAD)\u003c\/strong\u003e is an advanced coating process that creates extremely dense and durable layers on the optical surface. This makes the filter's coatings highly resistant to scratching from routine cleaning and degradation from environmental factors like humidity. It also yields superior anti-reflection performance, preventing halos and internal reflections.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this filter suitable for imaging large targets like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This filter is perfect for large, emission-rich targets like the North American Nebula (NGC 7000) or the Veil Nebula complex. It allows the critical \u003cstrong\u003eH-alpha and OIII\u003c\/strong\u003e light from the nebula to pass through while blocking skyglow, making it ideal for capturing these objects with wide-field refractors or camera lenses.\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\u003eAstro Multispectra Light Pollution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e48mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread\u003c\/td\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Substrate\u003c\/td\u003e\n\u003ctd\u003eSchott B270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating Technology\u003c\/td\u003e\n\u003ctd\u003eSTC Ultra Layer IBAD\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\"\u003eWilliam Optics STC Ultra Layer Astro Multispectra Filter - 48mm\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967226573085,"sku":"WO-YF-STC-M48","price":328.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-STC-Ultra-Layer-Astro-Multispectra-Filter-48mm-YF-STC-M48-1__78203.1596133266.1280.1280.jpg?v=1684339482"},{"product_id":"chroma-h-alpha-filter-3nm","title":"Chroma H-alpha Filter - 3nm","description":"\u003c!-- more --\u003e\u003cp\u003eH-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656.3nm, a narrow-band emission filter is required to separate H-alpha from the SII doublet (671.6nm and 673.1nm).\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":44967243612445,"sku":"CT-27001-1.25M","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967243645213,"sku":"CT-27001-31D","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967243677981,"sku":"CT-27001-36D","price":1085.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967243710749,"sku":"CT-27001-2M","price":1820.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967243743517,"sku":"CT-27001-50D","price":1750.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967243776285,"sku":"CT-27001-50X50","price":2170.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-H-alpha-3nm-Filter__77186.1596071504.1280.1280.jpg?v=1684339497"},{"product_id":"chroma-h-alpha-filter-5nm","title":"Chroma H-alpha Filter - 5nm","description":"\u003c!-- more --\u003e\u003cp\u003eH-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656.3nm, a narrow-band emission filter is required to separate H-alpha from the SII doublet (671.6nm and 673.1nm).\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":44967243809053,"sku":"CT-27002-1.25M","price":644.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967243841821,"sku":"CT-27002-31D","price":644.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967243874589,"sku":"CT-27002-36D","price":868.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967243907357,"sku":"CT-27002-2M","price":1365.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967243940125,"sku":"CT-27002-50D","price":1295.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967243972893,"sku":"CT-27002-50X50","price":1932.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-H-alpha-5nm-Filter__56496.1596071505.1280.1280.jpg?v=1684339501"},{"product_id":"chroma-h-alpha-filter-8nm","title":"Chroma H-alpha Filter - 8nm","description":"\u003c!-- more --\u003e\u003cp\u003eH-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656.3nm, a narrow-band emission filter is required to separate H-alpha from the SII doublet (671.6nm and 673.1nm).\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":44967244038429,"sku":"CT-27003-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967244071197,"sku":"CT-27003-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967244103965,"sku":"CT-27003-36D","price":497.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967244136733,"sku":"CT-27003-2M","price":1162.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967244169501,"sku":"CT-27003-50D","price":1092.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967244202269,"sku":"CT-27003-50X50","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-H-alpha-8nm-Filter__69220.1596071506.1280.1280.jpg?v=1684339504"},{"product_id":"chroma-h-beta-filter-3nm","title":"Chroma H-beta Filter - 3nm","description":"\u003c!-- more --\u003e\u003cp\u003eH-beta filters are also useful for imaging nebulae and objects rich in ionized hydrogen. At 486.1nm, a narrow-band filter is required to separate H-beta from nearby blue and green spectral lines. Although weaker than the H-alpha line, this is often used for visual detection as the longer red wavelengths of H-alpha are difficult to detect by eye.\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":44967244235037,"sku":"CT-27004-1.25M","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967244267805,"sku":"CT-27004-31D","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967244300573,"sku":"CT-27004-36D","price":1085.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967244333341,"sku":"CT-27004-2M","price":1820.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967244366109,"sku":"CT-27004-50D","price":1750.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967244398877,"sku":"CT-27004-50X50","price":2170.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-H-beta-3nm-Filter__82264.1596071507.1280.1280.jpg?v=1684339701"},{"product_id":"chroma-h-beta-filter-5nm","title":"Chroma H-beta Filter - 5nm","description":"\u003c!-- more --\u003e\u003cp\u003eH-beta filters are also useful for imaging nebulae and objects rich in ionized hydrogen. At 486.1nm, a narrow-band filter is required to separate H-beta from nearby blue and green spectral lines. Although weaker than the H-alpha line, this is often used for visual detection as the longer red wavelengths of H-alpha are difficult to detect by eye.\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":44967244464413,"sku":"CT-27005-1.25M","price":644.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967244497181,"sku":"CT-27005-31D","price":644.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967244529949,"sku":"CT-27005-36D","price":868.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967244562717,"sku":"CT-27005-2M","price":1365.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967244595485,"sku":"CT-27005-50D","price":1295.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967244628253,"sku":"CT-27005-50X50","price":1932.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-H-beta-5nm-Filter__19579.1596071508.1280.1280.jpg?v=1684339704"},{"product_id":"chroma-sii-filter-3nm","title":"Chroma SII Filter - 3nm","description":"\u003c!-- more --\u003e\u003cp\u003eSII filters isolate the spectral emission of singly ionized sulfur atoms, also common in nebulae. Emission is at two lines occurring as a doublet, at 671.6 and 673.1 nm. This filter also separates sulfur emission from H-alpha emission (656.3nm).\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. 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Emission is at two lines occurring as a doublet, at 671.6 and 673.1 nm. This filter also separates sulfur emission from H-alpha emission (656.3nm).\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":44967244955933,"sku":"CT-27010-1.25M","price":644.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967244988701,"sku":"CT-27010-31D","price":644.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967245021469,"sku":"CT-27010-36D","price":868.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967245054237,"sku":"CT-27010-2M","price":1365.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967245087005,"sku":"CT-27010-50D","price":1295.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967245119773,"sku":"CT-27010-50X50","price":1932.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-SII-5nm-Filter__94086.1596071511.1280.1280.jpg?v=1684339711"},{"product_id":"chroma-sii-filter-8nm","title":"Chroma SII Filter - 8nm","description":"\u003c!-- more --\u003e\u003cp\u003eSII filters isolate the spectral emission of singly ionized sulfur atoms, also common in nebulae. Emission is at two lines occurring as a doublet, at 671.6 and 673.1 nm. This filter also separates sulfur emission from H-alpha emission (656.3nm).\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":44967245185309,"sku":"CT-27011-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967245218077,"sku":"CT-27011-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967245250845,"sku":"CT-27011-36D","price":497.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967245283613,"sku":"CT-27011-2M","price":1162.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967245316381,"sku":"CT-27011-50D","price":1092.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967245349149,"sku":"CT-27011-50X50","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-SII-8nm-Filter__22113.1596071512.1280.1280.jpg?v=1684339715"},{"product_id":"chroma-oiii-filter-3nm","title":"Chroma OIII Filter - 3nm","description":"\u003c!-- more --\u003e\u003cp\u003eChroma’s OIII filters isolate the 500.7nm primary emission line of doubly ionized oxygen. After H-alpha, this is the next most common emission when imaging nebulae\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":44967245381917,"sku":"CT-27006-1.25M","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967245414685,"sku":"CT-27006-31D","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967245447453,"sku":"CT-27006-36D","price":1085.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967245480221,"sku":"CT-27006-2M","price":1820.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967245512989,"sku":"CT-27006-50D","price":1750.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967245545757,"sku":"CT-27006-50X50","price":2170.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-OIII-3nm-Filter__30198.1596071513.1280.1280.jpg?v=1684339508"},{"product_id":"chroma-oiii-filter-5nm","title":"Chroma OIII Filter - 5nm","description":"\u003c!-- more --\u003e\u003cp\u003eChroma’s OIII filters isolate the 500.7nm primary emission line of doubly ionized oxygen. After H-alpha, this is the next most common emission when imaging nebulae\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":44967245611293,"sku":"CT-27007-1.25M","price":644.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967245644061,"sku":"CT-27007-31D","price":644.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967245676829,"sku":"CT-27007-36D","price":868.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967245709597,"sku":"CT-27007-2M","price":1365.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967245742365,"sku":"CT-27007-50D","price":1295.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967245775133,"sku":"CT-27007-50X50","price":1932.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-OIII-5nm-Filter__52324.1596071514.1280.1280.jpg?v=1684339511"},{"product_id":"chroma-oiii-filter-8nm","title":"Chroma OIII Filter - 8nm","description":"\u003c!-- more --\u003e\u003cp\u003eChroma’s OIII filters isolate the 500.7nm primary emission line of doubly ionized oxygen. After H-alpha, this is the next most common emission when imaging nebulae\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":44967245807901,"sku":"CT-27008-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967245840669,"sku":"CT-27008-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967245873437,"sku":"CT-27008-36D","price":497.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967245906205,"sku":"CT-27008-2M","price":1162.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967245938973,"sku":"CT-27008-50D","price":1092.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967245971741,"sku":"CT-27008-50X50","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-OIII-8nm-Filter__01564.1596071516.1280.1280.jpg?v=1684339515"},{"product_id":"chroma-luminance-filter","title":"Chroma Luminance Filter","description":"\u003c!-- more --\u003e\u003cp\u003eLuminance filter for enhancing color rendering with RGB set\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":44967246070045,"sku":"CT-27040-1.25M","price":210.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967246102813,"sku":"CT-27040-31D","price":210.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967246135581,"sku":"CT-27040-36D","price":315.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967246168349,"sku":"CT-27040-2M","price":700.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967246201117,"sku":"CT-27040-50D","price":630.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967246233885,"sku":"CT-27040-50X50","price":665.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-Luminance-Filter__08679.1596071517.1280.1280.jpg?v=1684339517"},{"product_id":"chroma-red-filter","title":"Chroma Red Filter","description":"\u003c!-- more --\u003e\u003cp\u003eRed filter for color rendering with RGB set\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":44967247708445,"sku":"CT-27041-1.25M","price":210.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967247741213,"sku":"CT-27041-31D","price":210.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967247773981,"sku":"CT-27041-36D","price":315.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967247806749,"sku":"CT-27041-2M","price":700.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967247839517,"sku":"CT-27041-50D","price":630.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967247872285,"sku":"CT-27041-50X50","price":665.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-Red-Filter__89625.1596071518.1280.1280.jpg?v=1684339717"},{"product_id":"chroma-green-filter","title":"Chroma Green Filter","description":"\u003c!-- more --\u003e\u003cp\u003eGreen filter for color rendering with RGB set\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":44967247905053,"sku":"CT-27042-1.25M","price":210.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967247937821,"sku":"CT-27042-31D","price":210.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967247970589,"sku":"CT-27042-36D","price":315.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967248003357,"sku":"CT-27042-2M","price":700.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967248068893,"sku":"CT-27042-50D","price":630.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967248101661,"sku":"CT-27042-50X50","price":665.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-Green-Filter__89486.1596071518.1280.1280.jpg?v=1684339719"},{"product_id":"chroma-blue-filter","title":"Chroma Blue Filter","description":"\u003c!-- more --\u003e\u003cp\u003eBlue filter for color rendering with RGB set\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":44967248134429,"sku":"CT-27043-1.25M","price":210.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967248167197,"sku":"CT-27043-31D","price":210.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967248199965,"sku":"CT-27043-36D","price":315.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967248232733,"sku":"CT-27043-2M","price":700.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967248265501,"sku":"CT-27043-50D","price":630.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967248298269,"sku":"CT-27043-50X50","price":665.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-Blue-Filter__36624.1596071519.1280.1280.jpg?v=1684339721"},{"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":"chroma-loglow-filter","title":"Chroma LoGlow Filter","description":"\u003c!-- more --\u003e\u003cp\u003eBlocks common spectral lines from lighting sources. This filter provides balanced color for the visible spectrum while blocking most emission from metal-halide and vapor lamp sources which together contribute to sky glow.\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\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":44967248593181,"sku":"CT-27030-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967248625949,"sku":"CT-27030-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967248658717,"sku":"CT-27030-36D","price":497.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967248691485,"sku":"CT-27030-2M","price":707.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967248724253,"sku":"CT-27030-50D","price":637.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967248757021,"sku":"CT-27030-50X50","price":770.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-LoGlow-Filter__74050.1596071521.1280.1280.jpg?v=1684339519"},{"product_id":"chroma-clear-filter","title":"Chroma Clear Filter","description":"\u003c!-- more --\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":44967248822557,"sku":"CT-27044-1.25M","price":182.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967248855325,"sku":"CT-27044-31D","price":182.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967248888093,"sku":"CT-27044-36D","price":210.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967248920861,"sku":"CT-27044-2M","price":525.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967248953629,"sku":"CT-27044-50D","price":455.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967248986397,"sku":"CT-27044-50X50","price":490.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-Clear-Filter__90054.1596071523.1280.1280.jpg?v=1684339522"},{"product_id":"chroma-u-bessel-filter","title":"Chroma U-Bessel Filter","description":"\u003c!-- more --\u003e\u003cp\u003eUV photometric filter in UVBRI series\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":44967249051933,"sku":"CT-27050-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967249084701,"sku":"CT-27050-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967249117469,"sku":"CT-27050-36D","price":483.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967249150237,"sku":"CT-27050-2M","price":980.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967249183005,"sku":"CT-27050-50D","price":910.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967249215773,"sku":"CT-27050-50X50","price":1015.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-U-Bessel-Filter__84625.1596071523.1280.1280.jpg?v=1684339524"},{"product_id":"chroma-v-bessel-filter","title":"Chroma V-Bessel Filter","description":"\u003c!-- more --\u003e\u003cp\u003eGreen (Visible) photometric filter in UVBRI series\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":44967249281309,"sku":"CT-27051-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967249314077,"sku":"CT-27051-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967249346845,"sku":"CT-27051-36D","price":483.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967249379613,"sku":"CT-27051-2M","price":980.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967249412381,"sku":"CT-27051-50D","price":910.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967249445149,"sku":"CT-27051-50X50","price":1015.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-V-Bessel-Filter__56381.1596071524.1280.1280.jpg?v=1684339526"},{"product_id":"chroma-b-bessel-filter","title":"Chroma B-Bessel Filter","description":"\u003c!-- more --\u003e\u003cp\u003eBlue photometric filter in UVBRI series\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":44967249510685,"sku":"CT-27052-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967249543453,"sku":"CT-27052-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967249576221,"sku":"CT-27052-36D","price":483.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967249608989,"sku":"CT-27052-2M","price":980.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967249641757,"sku":"CT-27052-50D","price":910.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967249674525,"sku":"CT-27052-50X50","price":1015.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-B-Bessel-Filter__40887.1596071525.1280.1280.jpg?v=1684339528"},{"product_id":"chroma-r-bessel-filter","title":"Chroma R-Bessel Filter","description":"\u003c!-- more --\u003e\u003cp\u003eRed photometric filter in UVBRI series\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":44967249740061,"sku":"CT-27053-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967249772829,"sku":"CT-27053-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967249805597,"sku":"CT-27053-36D","price":483.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967249838365,"sku":"CT-27053-2M","price":980.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967249871133,"sku":"CT-27053-50D","price":910.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967249903901,"sku":"CT-27053-50X50","price":1015.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-R-Bessel-Filter__30129.1596071526.1280.1280.jpg?v=1684339726"},{"product_id":"chroma-i-bessel-filter","title":"Chroma I-Bessel Filter","description":"\u003c!-- more --\u003e\u003cp\u003eNIR photometric filter in UVBRI series\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":44967250034973,"sku":"CT-27054-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967250067741,"sku":"CT-27054-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967250100509,"sku":"CT-27054-36D","price":483.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967250133277,"sku":"CT-27054-2M","price":980.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967250166045,"sku":"CT-27054-50D","price":910.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967250198813,"sku":"CT-27054-50X50","price":1015.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-I-Bessel-Filter__54362.1596071527.1280.1280.jpg?v=1684339728"},{"product_id":"chroma-ubvri-filter-set","title":"Chroma UBVRI Filter Set","description":"\u003c!-- more --\u003e\u003cp\u003eUBVRI filter set for photometric imaging\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":44967250264349,"sku":"CT-27103-1.25M","price":1645.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967250297117,"sku":"CT-27103-31D","price":2275.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967250329885,"sku":"CT-27103-36D","price":2415.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967250362653,"sku":"CT-27103-2M","price":4620.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967250395421,"sku":"CT-27103-50D","price":4270.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967250428189,"sku":"CT-27103-50X50","price":4795.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-Bessel-UBVRI-Filters__13320.1596071528.1280.1280.jpg?v=1684339731"},{"product_id":"chroma-lrgb-filter-set","title":"Chroma LRGB Filter Set","description":"\u003c!-- more --\u003e\u003cp\u003eLuminance, Red, Green, and Blue astronomy filter set\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":44967250460957,"sku":"CT-27101-1.25M","price":735.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967250493725,"sku":"CT-27101-31D","price":735.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967250526493,"sku":"CT-27101-36D","price":1155.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967250559261,"sku":"CT-27101-2M","price":2695.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967250592029,"sku":"CT-27101-50D","price":2415.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967250624797,"sku":"CT-27101-50X50","price":2555.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-LRGB-Filters__96415.1596071530.1280.1280.jpg?v=1684339733"},{"product_id":"chroma-halrgb-filter-set","title":"Chroma HaLRGB Filter Set","description":"\u003c!-- more --\u003e\u003cp\u003e8nm H-alpha, Luminance, Red, Green, and Blue astronomy filter set\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 \/ 8nm","offer_id":44967250723101,"sku":"CT-27102-1.25M","price":1085.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ 5nm","offer_id":44967250755869,"sku":"CT-HA5LRGB-1.25M","price":1344.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ 3nm","offer_id":44967250788637,"sku":"CT-HA3LRGB-1.25M","price":1505.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ 8nm","offer_id":44967250821405,"sku":"CT-27102-31D","price":1085.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ 5nm","offer_id":44967250854173,"sku":"CT-HA5LRGB-31D","price":1344.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ 3nm","offer_id":44967250886941,"sku":"CT-HA3LRGB-31D","price":1505.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ 8nm","offer_id":44967250919709,"sku":"CT-27102-36D","price":1617.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ 5nm","offer_id":44967250952477,"sku":"CT-HA5LRGB-36D","price":1988.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ 3nm","offer_id":44967250985245,"sku":"CT-HA3LRGB-36D","price":2205.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ 8nm","offer_id":44967251018013,"sku":"CT-27102-2M","price":3822.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ 5nm","offer_id":44967251050781,"sku":"CT-HA5LRGB-2M","price":4025.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ 3nm","offer_id":44967251083549,"sku":"CT-HA3LRGB-2M","price":4480.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ 8nm","offer_id":44967251116317,"sku":"CT-27102-50D","price":3472.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ 5nm","offer_id":44967251149085,"sku":"CT-HA5LRGB-50D","price":3675.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ 3nm","offer_id":44967251181853,"sku":"CT-HA3LRGB-50D","price":4130.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted \/ 8nm","offer_id":44967251214621,"sku":"CT-27102-50X50","price":3626.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted \/ 5nm","offer_id":44967251247389,"sku":"CT-HA5LRGB-50X50","price":4452.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted \/ 3nm","offer_id":44967251280157,"sku":"CT-HA3LRGB-50X50","price":4690.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-HaLRGB-Filters__04231.1596071532.1280.1280.jpg?v=1684339530"},{"product_id":"chroma-h-alpha-filter-optimized-for-f-3-3nm","title":"Chroma H-alpha Filter Optimized for f\/3 - 3nm","description":"\u003c!-- more --\u003e\u003cp\u003eH-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656.3nm, a narrow-band emission filter is required to separate H-alpha from the SII doublet (671.6nm and 673.1nm).\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFilters designed for use with CCD and for f\/3.0 telescopes\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. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25\" Round Mounted","offer_id":44967251378461,"sku":"CT-27001F3-1.25M","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967251411229,"sku":"CT-27001F3-31D","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967251443997,"sku":"CT-27001F3-36D","price":1085.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967251476765,"sku":"CT-27001F3-2M","price":1820.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967251509533,"sku":"CT-27001F3-50D","price":1750.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967251542301,"sku":"CT-27001F3-50X50","price":2170.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-H-alpha-3nm-Filter__61895.1596071533.1280.1280.jpg?v=1684339534"},{"product_id":"chroma-sii-filter-optimized-for-f-3-3nm","title":"Chroma SII Filter Optimized for f\/3 - 3nm","description":"\u003c!-- more --\u003e\u003cp\u003eSII filters isolate the spectral emission of singly ionized sulfur atoms, also common in nebulae. Emission is at two lines occurring as a doublet, at 671.6 and 673.1 nm. This filter also separates sulfur emission from H-alpha emission (656.3nm).\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFilters designed for use with CCD and for f\/3.0 telescopes\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. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25\" Round Mounted","offer_id":44967252099357,"sku":"CT-27009F3-1.25M","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967252132125,"sku":"CT-27009F3-31D","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967252164893,"sku":"CT-27009F3-36D","price":1085.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967252197661,"sku":"CT-27009F3-2M","price":1820.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967252230429,"sku":"CT-27009F3-50D","price":1750.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967252263197,"sku":"CT-27009F3-50X50","price":2170.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-SII-3nm-Filter__73590.1596071536.1280.1280.jpg?v=1684339736"},{"product_id":"chroma-oiii-filter-optimized-for-f-3-3nm","title":"Chroma OIII Filter Optimized for f\/3 - 3nm","description":"\u003c!-- more --\u003e\u003cp\u003eChroma’s OIII filters isolate the 500.7nm primary emission line of doubly ionized oxygen. After H-alpha, this is the next most common emission when imaging nebulae\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFilters designed for use with CCD and for f\/3.0 telescopes\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. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25\" Round Mounted","offer_id":44967252754717,"sku":"CT-27006F3-1.25M","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967252820253,"sku":"CT-27006F3-31D","price":805.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967252853021,"sku":"CT-27006F3-36D","price":1085.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967252885789,"sku":"CT-27006F3-2M","price":1820.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967252918557,"sku":"CT-27006F3-50D","price":1750.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967252951325,"sku":"CT-27006F3-50X50","price":2170.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-OIII-3nm-Filter__18267.1596071539.1280.1280.jpg?v=1684339747"},{"product_id":"baader-dslr-2-filter-holder-m48-sp54","title":"Baader DSLR-2\" Filter Holder - M48\/SP54","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdapts 2\" astronomical filters with M48 threads for use on standard DSLR camera lenses\u003c\/li\u003e\n\u003cli\u003eProvides a standard SP54 female thread for connection to various lens adapter rings\u003c\/li\u003e\n\u003cli\u003eFeatures a 46mm clear aperture to minimize vignetting on full-frame sensors\u003c\/li\u003e\n\u003cli\u003eEnables wide-field astrophotography with specialized nebula or light pollution 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\u003eBaader DSLR-2\" Filter Holder - M48\/SP54\u003c\/h2\u003e\n\u003cp\u003eThe Baader DSLR-2\" Filter Holder bridges the critical gap between professional M48 threaded astronomical filters and the world of DSLR camera lenses. This precision adapter converts the standard 2\" astro-filter M48 thread to the versatile SP54 photographic standard, allowing you to attach high-end nebula and light pollution filters directly to your lens for stunning wide-field 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\u003eBridge the Gap: Use 2\" M48 Astro-Filters on Your Camera Lens\u003c\/h3\u003e\n\u003cp\u003eYou no longer need to compromise by using smaller, less effective filters for your camera lens astrophotography. This holder allows you to deploy your best 2\" (M48 thread) filters, originally intended for telescopes, directly onto your photography rig. With a clear aperture of 46mm, it's designed to illuminate large sensors and minimize the risk of vignetting, even with fast, wide-angle lenses.\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 Modular System: Adapting to M46, M52, M58 \u0026amp; More\u003c\/h3\u003e\n\u003cp\u003eThe M48\/SP54 Filter Holder is the core of a flexible system. Its female SP54 thread serves as a universal base, accepting a wide range of optional Baader lens adapter rings. Whether your lens has a front filter thread of M46, M49, M52, M55, M58, or M62, a corresponding ring is available to create a secure, light-tight connection. This modularity ensures you can use your premium 2\" filters across your entire collection of camera lenses.\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 DSLR-2\" Filter Holder?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts sole purpose is to allow you to attach standard 2-inch astronomical filters, which use an M48 thread, to the front of a standard DSLR or mirrorless camera lens. This lets you use high-grade astronomical filters for wide-field astrophotography without a telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the Baader M48\/SP54 Filter Holder to my specific camera lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, identify the filter thread size of your camera lens (e.g., 52mm, 58mm, 62mm), which is usually printed on the front of the lens. You will then need the corresponding \u003cstrong\u003eoptional Baader SP54 adapter ring\u003c\/strong\u003e (e.g., SP54\/M52). The adapter ring threads onto your lens, and the DSLR-2\" Filter Holder then threads onto the adapter ring. Finally, your 2\" M48 filter threads into the holder.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader DSLR-2\" Filter Holder cause vignetting with my wide-angle lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe holder is designed with a \u003cstrong\u003e46mm clear aperture\u003c\/strong\u003e to be as unrestrictive as possible and works well with many lenses. However, some vignetting can still occur, especially with ultra-wide-angle lenses used at their fastest apertures. The degree of vignetting depends on the specific lens design and focal length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Baader Filter Holder to image the North American Nebula (NGC 7000) with a DSLR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an ideal application. By attaching a 2\" H-alpha or dual-band nebula filter to your camera lens using this holder, you can capture the vast expanse of targets like the North American Nebula (NGC 7000) or the Andromeda Galaxy (M31) in a single frame, revealing details that are normally invisible to an unmodified camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the M48 and SP54 designations on the Baader Filter Holder mean?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThese refer to the thread standards the adapter connects:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48:\u003c\/strong\u003e This is the standard metric thread (48mm x 0.75mm pitch) used on virtually all 2\" astronomical filters. The holder has female M48 threads to accept these filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSP54:\u003c\/strong\u003e This is a 54mm thread that Baader uses as a versatile intermediate connection. The holder has female SP54 threads that accept various optional step-down rings to match different camera lens threads.\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 lens adapter rings (e.g., SP54\/M52) included with the Baader DSLR-2\" Filter Holder?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Baader DSLR-2\" Filter Holder (#2408166) is the central component only. The specific adapter ring needed to match your camera lens's filter thread must be purchased separately.\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\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e47\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e56\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Adapter\u003c\/td\u003e\n\u003ctd\u003eExpanding Adapter, Filter holder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsage\u003c\/td\u003e\n\u003ctd\u003eto mount our 2\" filters on any DSLR camera lens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eSP54\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003e2\"\/SCT Thread (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdaptable to\u003c\/td\u003e\n\u003ctd\u003eDSLR camera-lenses\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapters Family\u003c\/td\u003e\n\u003ctd\u003eSP54 System\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_Hyperion_Eyepieces_Application_Examples.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 Hyperion Eyepieces Application Examples\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_Digiscoping_Camera_Adaptations_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 Digiscoping Camera Adaptations 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 Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967306527005,"sku":"BAA-2408166","price":40.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-DSLR-2-inch-Filter-Holder-M48-SP54-1__68176.1597110567.1280.1280.jpg?v=1684340286"},{"product_id":"baader-universal-filter-changer-ufc-base","title":"Baader Universal Filter Changer (UFC) Base","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eThe foundational component of the Baader Universal Filter Changer (UFC) system\u003c\/li\u003e\n\u003cli\u003eActs as the central chamber for accepting various UFC filter sliders\u003c\/li\u003e\n\u003cli\u003eFeatures S70 dovetail receptors on both sides for telescope and camera adapters\u003c\/li\u003e\n\u003cli\u003eEnables a fully customizable, low-profile filter solution for any imaging train\u003c\/li\u003e\n\u003cli\u003eDesigned to solve complex adaptation and back-focus challenges\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 Universal Filter Changer (UFC) Base\u003c\/h2\u003e\n\u003cp\u003eThe Baader Universal Filter Changer (UFC) Base is the core chassis of Baader's modular filter system, designed to replace rigid, single-purpose filter wheels with a completely adaptable solution. This unit serves as the primary filter chamber, accepting a wide range of filter sliders and connecting to your telescope and camera via the versatile S70 dovetail system. For imagers with multiple optical tubes or cameras, the UFC Base is the key to creating a standardized, low-profile filter setup that can be reconfigured for any target or hardware combination.\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 UFC Base: A Central Chamber for Any Filter\u003c\/h3\u003e\n\u003cp\u003eAt its heart, the UFC Base is a precisely engineered housing for Baader's family of filter sliders. Instead of rotating filters electronically, you manually insert sliders, a design that minimizes back focus and eliminates the large housings required by traditional filter wheels. This approach allows you to quickly swap between entire sets of filters—like LRGB and narrowband—without disassembling your imaging train.\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 S70 Dovetail: Universal Adaptation for Your Gear\u003c\/h3\u003e\n\u003cp\u003eThe true power of the UFC Base lies in its dual S70 dovetail receptors. This Baader-specific standard allows the base to connect to a vast ecosystem of adapters, enabling secure, flexure-free attachment to nearly any piece of equipment. Whether you need to connect to M68, M54, M48, SCT threads, or even a specific camera bayonet, there is a UFC adapter to make it possible, ensuring perfect alignment and spacing.\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\u003eUFC Sliders vs. Filter Wheels: The Flexibility Trade-Off\u003c\/h3\u003e\n\u003cp\u003eChoosing the UFC system over an electronic filter wheel is a conscious decision to prioritize flexibility over automation. A filter wheel is ideal for unattended, sequential imaging of a single target. The UFC system, however, excels where a filter wheel cannot: solving critical back-focus issues, accommodating multiple filter sizes in one system, and adapting a single filter setup across entirely different telescopes and cameras without costly duplication of hardware.\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 Baader UFC Base and why do I need it for the UFC system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eBaader UFC Base\u003c\/strong\u003e is the mandatory central component of the Universal Filter Changer system. It functions as the housing or \"chamber\" that holds the filter sliders. You cannot build a UFC assembly without it, as it provides the S70 dovetail connection points for all telescope- and camera-side adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader UFC Base connect to my telescope and camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe UFC Base uses the \u003cstrong\u003eBaader S70 dovetail system\u003c\/strong\u003e on both sides. You must purchase separate UFC adapters to match your specific hardware. For example, you might buy an S70 to 2\" nosepiece adapter for the telescope side and an S70 to M48 adapter for your camera side. This modularity allows it to fit virtually any imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat filter sliders are compatible with the Baader UFC Base?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe UFC Base is designed to work with all Baader UFC filter sliders. These are available for various filter types, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMounted 1.25\" filters\u003c\/li\u003e\n\u003cli\u003eMounted 2\" filters\u003c\/li\u003e\n\u003cli\u003eUnmounted 31mm, 36mm, and 50mm filters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader UFC system a better choice than a filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt depends on your needs. A \u003cstrong\u003efilter wheel\u003c\/strong\u003e is better for automated, remote imaging where you need to cycle through filters without manual intervention. The \u003cstrong\u003eUFC system\u003c\/strong\u003e is superior for those who need maximum flexibility, have tight back-focus requirements, use multiple telescopes and cameras, or need to accommodate different filter sizes within one system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow can I integrate the Baader UFC Base with my Celestron SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo use the UFC Base with a Schmidt-Cassegrain telescope, you would typically select the Baader UFC S70 to 2.9\" SCT thread adapter for the telescope side. For the camera side, you would choose the appropriate adapter for your camera's connection (e.g., M48 or M54), ensuring your total back focus remains within the telescope's optimal distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader UFC Base cause vignetting on my fast f\/4 refractor with a full-frame sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe UFC system is designed to be as low-profile as possible, but vignetting always depends on the entire optical train. The clear aperture of the S70 system is quite large. To ensure an unvignetted field with a full-frame sensor, especially on a fast instrument, you should use the largest possible filter sliders (e.g., for 50mm unmounted filters) and select adapters that maintain the widest possible light path, like M68-threaded connections if your system supports them.\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 colspan=\"2\" style=\"text-align:center;\"\u003eNo specifications provided.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eS70\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\"\u003eNo items listed in the box.\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_Universal_Filter_Changer_UFC_Technical_Drawings.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 Universal Filter Changer UFC Technical Drawings\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":44967309279517,"sku":"BAA-2459110","price":85.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-Universal-Filter-Changer-UFC-Base-1__13895.1597110633.1280.1280.jpg?v=1684340384"},{"product_id":"baader-ufc-aux-mounted-filter-holder-1-25-requires-ufc-rd50","title":"Baader UFC AUX Mounted Filter-Holder - 1.25\" (requires UFC-RD50)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eHolds standard 1.25\" threaded filters\u003c\/li\u003e\n\u003cli\u003eDesigned for the Baader Universal Filter Changer (UFC) system\u003c\/li\u003e\n\u003cli\u003eMounts inside the UFC-RD50 Filter Slider\u003c\/li\u003e\n\u003cli\u003eEnables quick, thread-free filter swaps\u003c\/li\u003e\n\u003cli\u003eMaintains a secure, repeatable optical path\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 UFC AUX Mounted Filter-Holder - 1.25\" (requires UFC-RD50)\u003c\/h2\u003e\n\u003cp\u003eThe Baader UFC AUX Mounted Filter-Holder provides a dedicated mounting solution for standard 1.25\" threaded filters within the modular Baader Universal Filter Changer system. This holder is designed exclusively for use with the Baader UFC-RD50 Filter Slider (#2459113), which is a required component for its operation.\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 Dedicated 1.25\" Holder for the UFC-RD50 Slider\u003c\/h3\u003e\n\u003cp\u003eThis component allows you to securely install a single 1.25\" filter into a UFC-RD50 slider. By equipping multiple sliders with these holders, you can pre-load your entire filter collection—such as LRGB or narrowband sets—and swap them into your imaging train in seconds without fumbling with threads in the dark. This holder is the key to integrating 1.25\" filters into the UFC quick-change workflow.\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\u003eIntegrating into the Baader UFC System\u003c\/h3\u003e\n\u003cp\u003eThe Baader UFC system is an infinitely adaptable solution for connecting cameras, telescopes, and accessories while managing filtration. This 1.25\" filter holder is a crucial piece of that ecosystem, ensuring your filters are held rigidly and precisely within the optical path. Its function is simple but essential: it adapts the UFC-RD50 slider for use with the industry's most common filter format, maintaining the system's goal of a solid, low-profile, and versatile connection.\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 Baader UFC 1.25\" AUX Filter-Holder for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis holder is designed to securely mount a standard 1.25\" threaded filter inside a \u003cstrong\u003eBaader UFC-RD50 Filter Slider (#2459113)\u003c\/strong\u003e. It allows you to use 1.25\" filters within Baader's Universal Filter Changer system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need any other parts to use this 1.25\" UFC Filter-Holder?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eYes, this part is not usable on its own.\u003c\/strong\u003e You must have the Baader UFC-RD50 Filter Slider, as this holder is designed to be installed inside of it. The slider and the rest of the UFC base system are sold separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader UFC 1.25\" Filter-Holder to quickly switch between an L-Pro and a UHC filter on my SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The intended workflow is to purchase two UFC-RD50 sliders and two of these 1.25\" holders. You can then pre-install your L-Pro filter in one slider assembly and the UHC in the other, allowing you to swap them at the telescope in just a few seconds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this Baader UFC filter holder work with 2\" or unmounted 50mm filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this specific holder is only for threaded 1.25\" filters. Baader makes other dedicated holders and sliders for different filter sizes, such as 2\" and unmounted 50.4mm or 50x50mm filters, as part of the modular UFC system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm building a lightweight imaging train for my RedCat 51. Is this Baader 1.25\" holder part of a low-profile system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the entire Baader UFC system is engineered to add minimal back-focus and maintain a rigid, compact connection between your camera and telescope. This 1.25\" holder is a key component for integrating filters into that low-profile setup, making it an excellent choice for systems where back-focus is critical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader 1.25\" AUX Filter-Holder attach?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is secured inside the Baader UFC-RD50 Filter Slider. It does not attach directly to a camera, focuser, or telescope on its own; it is an internal component for the filter slider.\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\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\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":"Default Title","offer_id":44967309508893,"sku":"BAA-2459153","price":17.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-UFC-AUX-Mounted-Filter-Holder-1-25-inch-requires-UFC-RD50-1__58477.1597110637.1280.1280.jpg?v=1684340321"},{"product_id":"baader-ufc-filter-slider-for-2-mounted-filters","title":"Baader UFC Filter Slider - for 2\" Mounted Filters","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnables use of standard 2\" mounted filters in the UFC system\u003c\/li\u003e\n\u003cli\u003eAllows for rapid, tool-free filter changes\u003c\/li\u003e\n\u003cli\u003eMaintains a consistent optical path for parfocal results\u003c\/li\u003e\n\u003cli\u003eFeatures standard M48 filter threads for secure mounting\u003c\/li\u003e\n\u003cli\u003eDesigned for the Baader Universal Filter Changer (UFC) ecosystem\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 UFC Filter Slider - for 2\" Mounted Filters\u003c\/h2\u003e\n      \u003cp\u003eThe Baader UFC Filter Slider for 2\" Mounted Filters is the essential component for integrating your existing library of standard 2-inch filters into Baader's modular Universal Filter Changer system. This slider allows you to swap filters in seconds without unthreading any part of your imaging train, providing a secure and repeatable solution for manual filter changes. It is engineered to accept any standard 2\" filter with M48 threads, making it a direct fit for the vast majority of astronomical filters on the market.\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\u003eIntegrate Standard 2\" Filters into the Baader UFC System\u003c\/h3\u003e\n      \u003cp\u003eThis filter slider is the bridge between your collection of 2\" mounted filters and the rigid, adaptable Baader UFC ecosystem. Instead of a bulky filter wheel, the UFC system uses a slim base and interchangeable sliders, and this model is purpose-built for the common 2\" format. By mounting a filter into this slider, you can insert and remove it from the optical path instantly, which is ideal for switching between a light pollution filter and a natural-color filter, or for comparing different narrowband targets.\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\u003eUFC 2\" Slider vs. Other UFC Formats: Choosing the Right Component\u003c\/h3\u003e\n      \u003cp\u003eThe Baader UFC system offers sliders for various filter types, and choosing the correct one is critical. This 2\" mounted slider is designed specifically for observers and imagers who have already invested in standard cell-mounted filters. It provides the lowest-cost entry into the UFC system if you own these filters.\u003c\/p\u003e\n      \u003cp\u003eThis contrasts with other UFC sliders made for unmounted, larger-format filters (e.g., 50mm square), which are typically used in advanced setups with large sensors. If your gear is built around the 2\" standard, this slider is the correct component to ensure compatibility and ease of use within the UFC framework.\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 Baader UFC 2\" Filter Slider?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe main purpose of the Baader UFC 2\" Filter Slider is to allow you to use standard, cell-mounted 2-inch filters (with M48 threads) within the Baader Universal Filter Changer (UFC) system. It enables quick, tool-free swapping of filters in your imaging train.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my existing 2\" narrowband filters with this UFC Filter Slider?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. This slider is specifically designed for any standard 2\" filter mounted in a cell with M48 threads. This includes virtually all 2\" LRGB, narrowband (H-alpha, OIII, SII), and light pollution filters from major manufacturers.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader UFC Filter Slider install into the UFC Base?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe slider is designed to slide smoothly into the main UFC Base (sold separately) and is held in place securely. This allows you to prepare multiple sliders with different filters and swap them out in the field in just a few seconds without changing focus or camera orientation.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader UFC Filter Slider a replacement for an automated filter wheel?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this is a manual solution. The Baader UFC Filter Slider is designed for deliberate, hands-on filter changes. It is not automated and can only hold one filter at a time. It is an excellent choice for simplicity, light weight, and avoiding the backfocus consumption of a larger electronic filter wheel.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhen imaging the Orion Nebula (M42) with my SCT, can I quickly swap between an H-alpha and a multi-bandpass filter with this UFC slider?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. This is a perfect use case. You would have one filter slider for your H-alpha filter and a second one for your multi-bandpass filter. You could capture data with one, then simply slide it out and slide the other one in to capture data on the same target without reframing or refocusing.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI have a refractor with a 2\" focuser. Is this Baader UFC 2\" slider all I need to use my filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. This slider is a component of the larger Baader UFC system. You will also need the \u003cstrong\u003eUFC Base\u003c\/strong\u003e, as well as telescope-side and camera-side adapters to connect the UFC Base to your specific refractor and camera. This slider fits into that complete system.\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 Compatibility\u003c\/td\u003e\n\u003ctd\u003eStandard 2\" Mounted Filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem\u003c\/td\u003e\n\u003ctd\u003eBaader Planetarium Universal Filter Changer (UFC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.06\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\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_Universal_Filter_Changer_UFC_Technical_Drawings.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 Universal Filter Changer UFC Technical Drawings\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\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":"Default Title","offer_id":44967309574429,"sku":"BAA-2459112","price":66.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-UFC-Filter-Slider-for-2-inch-Mounted-Filters-1__80335.1597110639.1280.1280.jpg?v=1684340323"},{"product_id":"baader-ufc-aux-filter-holder-d-31mm-requires-ufc-rd50","title":"Baader UFC AUX Filter-Holder - D 31mm (requires UFC-RD50)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDesigned for 31mm Unmounted Filters\u003c\/li\u003e\n\u003cli\u003eIntegrates with the Baader UFC-RD50 Filter Slider\u003c\/li\u003e\n\u003cli\u003eEnables Dual-Filter Stacking in the UFC System\u003c\/li\u003e\n\u003cli\u003eComponent of the Baader Universal Filter Changer Ecosystem\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 UFC AUX Filter-Holder - D 31mm (requires UFC-RD50)\u003c\/h2\u003e\n\u003cp\u003eThe Baader UFC AUX Filter-Holder is designed to secure a 31mm unmounted filter inside the Baader UFC-RD50 Filter Slider (#2459113). This component is a specialized adapter that enables dual-filter configurations within a single optical path, adding significant flexibility to the Baader Universal Filter Changer (UFC) system.\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\u003eFor the UFC-RD50 Slider: Integrating a 31mm Filter\u003c\/h3\u003e\n\u003cp\u003eThis holder does not function as a standalone component; it is engineered exclusively to nest inside the larger UFC-RD50 filter slider. The RD50 slider is intended for 50.4mm round filters, and this AUX holder allows you to securely mount a smaller, 31mm unmounted filter within that same slider, expanding its capabilities beyond its primary format.\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\u003eDual-Filter Imaging: Stacking Filters in a Single Path\u003c\/h3\u003e\n\u003cp\u003eThe primary application for the UFC AUX 31mm holder is to stack two filters in the optical path. This is particularly useful for imagers who wish to combine a 31mm filter, such as a UV\/IR cut or a specific narrowband filter, with a primary 50.4mm filter housed in the main slot of the UFC-RD50 slider. This configuration allows for advanced imaging techniques without the need for a second filter wheel or slider.\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 purpose of the Baader UFC AUX Filter-Holder for 31mm filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts sole purpose is to allow you to mount a \u003cstrong\u003e31mm unmounted filter\u003c\/strong\u003e inside of a \u003cstrong\u003eBaader UFC-RD50 Filter Slider\u003c\/strong\u003e. This enables you to use smaller filters or create stacked filter combinations within the larger Baader UFC system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 31mm UFC AUX Filter-Holder without the UFC-RD50 slider?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This holder is not a standalone part and has no threads of its own. It is designed specifically to fit inside the machined receptacle of the Baader UFC-RD50 Filter Slider (#2459113) and cannot be used with any other component.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the UFC AUX holder work with mounted 1.25\" filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This holder is precisely machined for \u003cstrong\u003e31mm unmounted glass filters\u003c\/strong\u003e only. Standard 1.25\" filters are housed in threaded cells and will not fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I use the UFC AUX 31mm holder when imaging the Rosette Nebula (NGC 2244) with a monochrome camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA common technique is to place a \u003cstrong\u003e31mm unmounted UV\/IR Cut filter\u003c\/strong\u003e in this AUX holder. You would then place your primary \u003cstrong\u003e50.4mm H-alpha filter\u003c\/strong\u003e in the main slot of the UFC-RD50 slider. This stack ensures clean, high-contrast data by capturing the nebula's specific emission line while blocking unfocused infrared light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI use a one-shot-color camera with an f\/5 Newtonian. Can I use the UFC AUX 31mm holder to add a light pollution filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an excellent use case. If you have a \u003cstrong\u003e31mm unmounted light pollution filter\u003c\/strong\u003e (such as a UHC or multi-bandpass filter), you can install it in this holder within your UFC-RD50 slider. This allows you to add powerful light pollution suppression to your imaging train without needing to purchase a larger, more expensive 50mm filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhere does the UFC AUX 31mm holder fit into the overall Baader UFC system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThink of it as an accessory for an accessory. It fits \u003cstrong\u003einside\u003c\/strong\u003e the UFC-RD50 slider, which in turn slides \u003cstrong\u003einto\u003c\/strong\u003e the main UFC Base (#2459110). It is a modular component designed to add another layer of filtering flexibility to your existing UFC setup.\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\u003e31mm, Unmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eRequires Baader UFC-RD50 Filter Slider (#2459113)\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\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\"\u003eThis product listing is for the UFC AUX Filter-Holder only. Required components are sold separately.\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 Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967309607197,"sku":"BAA-2459151","price":17.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-UFC-AUX-Filter-Holder-D-31mm-requires-UFC-RD50-1__49933.1597110640.1280.1280.jpg?v=1684340338"},{"product_id":"baader-ufc-aux-filter-holder-d-36mm-requires-ufc-rd50","title":"Baader UFC AUX Filter-Holder - D 36mm (requires UFC-RD50)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eHolds one 36mm unmounted filter\u003c\/li\u003e\n\u003cli\u003eDesigned for the Baader UFC System\u003c\/li\u003e\n\u003cli\u003eRequires the UFC-RD50 Filter Slider (#2459113)\u003c\/li\u003e\n\u003cli\u003eEnables rapid filter changes in the field\u003c\/li\u003e\n\u003cli\u003eIdeal for creating a pre-loaded filter library\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\u003eBaader UFC AUX Filter-Holder - D 36mm (requires UFC-RD50)\u003c\/h2\u003e\n      \u003cp\u003eThe Baader UFC AUX Filter-Holder is designed as a spare or additional holder for a single 36mm unmounted filter within Baader's Universal Filter Changer (UFC) system. This holder requires the corresponding Baader UFC-RD50 filter slider to function, allowing you to prepare multiple filters for quick exchanges during an imaging session.\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\u003ePrepare Your 36mm Filters with an Extra UFC-RD50 Holder\u003c\/h3\u003e\n      \u003cp\u003eThe primary function of the UFC AUX Filter-Holder is to streamline your imaging workflow. By purchasing multiple holders, you can pre-load each of your 36mm LRGB or narrowband filters, keeping them safe and ready for immediate use. This eliminates the need to handle filters or small mounting screws in the dark, reducing the risk of drops or contamination.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eField Swapping:\u003c\/strong\u003e Simply slide one holder out of the UFC-RD50 slider and insert the next. This makes it fast and efficient to cycle through different filters for multi-channel imaging projects.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSecure Mounting:\u003c\/strong\u003e Provides a dedicated, secure housing for your unmounted 36mm filters, protecting them from damage when not in the optical path.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSystem Modularity:\u003c\/strong\u003e As a component of the Baader UFC ecosystem, this holder ensures perfect compatibility and spacing when used with the required UFC-RD50 slider.\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\"\u003eWhat is the Baader UFC AUX D 36mm Filter-Holder used for?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis is a spare or additional holder for a single 36mm unmounted filter. It is designed to be used with the \u003cstrong\u003eBaader UFC-RD50 Filter Slider (#2459113)\u003c\/strong\u003e. Its purpose is to allow you to have multiple filters pre-mounted and ready for quick swaps in the field.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this Baader UFC AUX D 36mm holder come with the UFC-RD50 slider?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. This product is only the auxiliary filter holder itself. You must purchase the \u003cstrong\u003eBaader UFC-RD50 Filter Slider\u003c\/strong\u003e separately to use it within the UFC system.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow many 36mm filters can I mount in one Baader UFC AUX holder?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eEach Baader UFC AUX D 36mm holder is designed to hold exactly one 36mm unmounted filter. To use multiple filters, you will need to purchase one holder for each filter you wish to have ready.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader UFC D 36mm holder to image the Horsehead Nebula (Barnard 33) with different narrowband filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this is an ideal use case. You can purchase several of these holders to mount your H-alpha, S-II, and O-III 36mm filters. This allows you to quickly swap between them using the UFC-RD50 slider, minimizing downtime while capturing data for a color composite image.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Baader UFC AUX holder work with my 8\" f\/4 Newtonian and the UFC system?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, as long as you have the complete Baader UFC system configured for your telescope's backfocus, this holder will work. Its function is dependent on the \u003cstrong\u003eUFC-RD50 slider\u003c\/strong\u003e, not the telescope type. The UFC system itself is designed to be adaptable to nearly any telescope, including f\/4 Newtonians.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I buy this Baader UFC AUX holder instead of just using the one that came with my slider?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe key benefit is efficiency. Owning multiple holders allows you to create a library of pre-mounted filters. Instead of stopping your imaging session to unscrew and swap a filter in the dark, you can simply pull out the entire slider\/holder assembly and insert the next one in seconds.\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\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\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":"Default Title","offer_id":44967309639965,"sku":"BAA-2459152","price":17.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-UFC-AUX-Filter-Holder-D-36mm-requires-UFC-RD50-1__65691.1597110641.1280.1280.jpg?v=1684340342"}],"url":"https:\/\/davidastro.com\/collections\/filters.oembed?page=13","provider":"David Astro","version":"1.0","type":"link"}