{"title":"Askar Dual-Band Filters","description":"\u003cp\u003eAskar dual-band filters belong to the Colour Magic line and pass two emission lines at once, Ha with OIII or SII with OIII, for imaging emission nebulae with a color camera from light-polluted sites. They come as 2\" filters in three families: the C1 and C2, the 6nm Super D1 and D2, and the 3nm Ultra E1 and E2.\u003c\/p\u003e\u003cp\u003eNarrower bandwidths give more contrast under bright skies. Each pair is also sold as a package, so you can combine both filters for a bicolor or SHO-style result.\u003c\/p\u003e","products":[{"product_id":"askar-6nm-color-magic-ha-oiii-sii-oiii-d1-d2-filter-package","title":"Askar 6nm Colour Magic Ha\/OIII \u0026 SII\/OIII (D1+D2) Filter Package","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e6nm Dual-Bandpass Filter Set\u003c\/li\u003e\n\u003cli\u003eIncludes D1 (Hα+OIII) and D2 (SII+OIII) Filters\u003c\/li\u003e\n\u003cli\u003eEnables SHO-like imaging with color cameras\u003c\/li\u003e\n\u003cli\u003eHigh contrast for light-polluted skies\u003c\/li\u003e\n\u003cli\u003eExcellent halo control around bright stars\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\u003eAskar 6nm Colour Magic Ha\/OIII \u0026amp; SII\/OIII (D1+D2) Filter Package\u003c\/h2\u003e\n\u003cp\u003eThe Askar 6nm Colour Magic Filter Package uses a tight 6nm bandpass to capture stunning narrowband images with your color camera. This innovative set includes two filters: a 6nm D1 (Hα\/OIII) and a 6nm D2 (SII\/OIII), designed to work together to isolate the three most critical emission nebula wavelengths without requiring a monochrome camera.\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-Filter System for 3-Band Narrowband Imaging\u003c\/h3\u003e\n\u003cp\u003eThis package redefines narrowband imaging for one-shot-color (OSC) camera users by splitting the data acquisition across two specialized filters. The first filter, D1, captures Hydrogen-alpha and Oxygen-III, the dominant signals in most emission nebulae. The second filter, D2, captures Sulphur-II and Oxygen-III, adding the final dataset needed for creating images with the celebrated \"Hubble Palette\" color scheme.\u003c\/p\u003e\n\u003cp\u003eBy capturing data through these two filters and combining the results during processing, you can produce detailed, multi-wavelength images that were previously the exclusive domain of more complex monochrome setups. This approach simplifies the imaging process while still delivering rich, high-contrast results.\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\u003e6nm Bandpass: Maximum Contrast and Halo Control\u003c\/h3\u003e\n\u003cp\u003eThe 6nm bandpass on each filter is engineered to aggressively reject unwanted light from urban light pollution, moonlight, and natural skyglow. This extreme signal isolation dramatically increases the contrast between your nebula target and the background sky, revealing faint structures and details that would otherwise be lost. \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-Sky from the City:\u003c\/strong\u003e The narrow 6nm window allows you to capture high-quality deep-sky data even from heavily light-polluted locations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHalo Suppression:\u003c\/strong\u003e Askar's design provides excellent control of halos around bright stars, a common issue with narrowband filters. This ensures clean star profiles and preserves the integrity of your target.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Optics Ready:\u003c\/strong\u003e While not designed exclusively for high-speed systems, these filters have been tested to perform well with modern, fast astrographs, maintaining signal strength and star quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAskar Duo-Filter vs. Mono Imaging: A New Workflow for Color Cameras\u003c\/h3\u003e\n\u003cp\u003eThe Colour Magic filter set offers a compelling alternative to the traditional monochrome imaging workflow. While a mono camera with a filter wheel provides the highest level of control, the Askar D1+D2 package delivers a significant portion of that capability with far less complexity and cost.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eYour Advantage (Askar D1+D2):\u003c\/strong\u003e You use the color camera you already own. Data acquisition is simplified to just two sessions (one for each filter), and processing is more straightforward than combining separate L, R, G, B, H, S, and O channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Mono Advantage:\u003c\/strong\u003e A monochrome setup allows for capturing data through each channel separately, offering maximum flexibility in processing and the ability to optimize exposure times for each emission line. This is a more involved, but ultimately more powerful, process.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor the OSC imager looking to step into the world of narrowband without investing in a full mono rig, the Askar Colour Magic package is the ideal solution.\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 Askar 6nm Colour Magic filter set work with a one-shot-color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou take two sets of exposures: one with the \u003cstrong\u003eD1 (Hα+OIII) filter\u003c\/strong\u003e and another with the \u003cstrong\u003eD2 (SII+OIII) filter\u003c\/strong\u003e. In processing software, you can separate the color channels from each set of images. The red channel from the D1 data contains your Hα signal, the red channel from D2 contains your SII, and the green\/blue channels from both contain your OIII. This allows you to combine them into a full SHO (Hubble Palette) image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of having OIII on both the Askar D1 and D2 filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCapturing Oxygen-III signal with both filters ensures you gather a very strong and clean OIII dataset. This is beneficial because OIII is often a weaker signal than H-alpha. Having it present in both master files gives you more flexibility and higher signal-to-noise ratio when processing your final image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use just the Askar 6nm D1 (Hα+OIII) filter by itself?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The D1 filter on its own is a powerful dual-narrowband filter, excellent for capturing emission nebulae like the Orion Nebula (M42) or Lagoon Nebula (M8) in high contrast. Using it alone will produce images with characteristic red and blue\/teal hues, similar to other popular dual-band filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I use the Askar 6nm Colour Magic set to image the Eagle Nebula (M16) with my f\/5 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Pillars of Creation in the Eagle Nebula (M16) are a perfect target. First, capture a series of long exposures with the D1 filter to get your Hα and OIII data. Then, swap to the D2 filter and capture another series of exposures to get your SII data. The 6nm bandpass will help define the intricate dark dust lanes against the glowing gas, even under moderately light-polluted skies with your f\/5 system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Askar 6nm filters work well on the Cygnus Loop (NGC 6960) from my Bortle 7 backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an ideal scenario for these filters. The Cygnus Loop (Veil Nebula complex) is rich in both Hα and OIII. The tight 6nm bandpass of the Askar filters will effectively block the strong light pollution from a Bortle 7 zone, allowing the delicate, filamentary structure of the supernova remnant to stand out with impressive contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this Askar 6nm filter set replace a traditional SHO filter set for mono cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNot directly. This set is designed to give \u003cstrong\u003ecolor camera users\u003c\/strong\u003e access to SHO-like color palettes. A traditional SHO filter set for monochrome cameras offers more control over the individual signals and is still the standard for advanced imagers. The Askar Colour Magic set provides a simpler, more accessible workflow to achieve similar results without needing a mono camera and filter wheel.\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\u003eDual-Band Narrowband Filter Set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth\u003c\/td\u003e\n\u003ctd\u003e6nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter 1 (D1)\u003c\/td\u003e\n\u003ctd\u003eH-alpha \/ OIII\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter 2 (D2)\u003c\/td\u003e\n\u003ctd\u003eSulphur-II \/ OIII\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:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" 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 \u0026amp; Drivers\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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968075297053,"sku":"ASK-CM-D1D2","price":875.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-Color-Magic-D1-D2__81140.1678398625.1280.1280.jpg?v=1684348734"},{"product_id":"askar-6nm-color-magic-super-sii-oiii-d2-filter-2","title":"Askar 6nm Colour Magic Super SII\/OIII D2 Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual-band filter passing OIII (6.5nm) and SII (8.5nm) wavelengths\u003c\/li\u003e\n\u003cli\u003ePeak transmittance of 85% for maximum signal capture\u003c\/li\u003e\n\u003cli\u003eDesigned for color cameras to complete the \"Hubble Palette\" (SHO)\u003c\/li\u003e\n\u003cli\u003eStandard 2\" mounted format\u003c\/li\u003e\n\u003cli\u003e1.85mm thickness for near-parfocal performance 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\u003eAskar 6nm Colour Magic Super SII\/OIII D2 Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Askar 6nm Colour Magic Super D2 Filter isolates the Sulfur-II and Oxygen-III emission lines, capturing the two signals often missing from standard color camera workflows. With a narrow 8.5nm bandpass for SII (672nm) and a 6.5nm bandpass for OIII (500.7nm), this filter achieves a peak transmittance of 85% to preserve faint nebula detail. Its ≥OD5 blocking across the 200-1100nm spectrum ensures high-contrast images by eliminating light pollution and stellar bloat, making it the essential second filter for creating full Hubble Palette images with a one-shot-color camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e6.5nm\/8.5nm Bandpasses with 85% Peak Transmittance\u003c\/h3\u003e\n\u003cp\u003eThe filter's dual-passband design is precisely engineered to isolate key emission lines. The 6.5nm FWHM centered on the 500.7nm OIII line and the slightly wider 8.5nm FWHM on the 672nm SII line provide an excellent balance between signal strength and contrast. This design allows the filter to deliver over 85% of the light from these specific wavelengths while aggressively rejecting city glow and other unwanted background signal.\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\u003eUnlocking Full SHO Imaging for Your Color Camera\u003c\/h3\u003e\n\u003cp\u003eFor imagers using color cameras, duo-narrowband filters that pass H-alpha and OIII are common, but they leave out the critical Sulfur-II data needed for the classic Hubble Palette (SHO). The Askar Super D2 filter is the missing link, designed specifically to be used in conjunction with an Hα\/OIII filter. By capturing SII and additional OIII data in a separate session, you can gather all three channels required to assemble a full SHO image without the complexity of a monochrome camera and filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptical Precision: OD5 Blocking and 30\" Parallelism\u003c\/h3\u003e\n\u003cp\u003eHigh-end imaging requires more than just narrow bandpasses. The Super D2 filter is built on a substrate with a parallelism of 30 arcseconds, preventing image degradation or focus shift when inserted into the optical train. With an optical density (OD) of 5 or greater, it blocks unwanted wavelengths from 200nm to 1100nm, effectively eliminating artifacts from UV, IR, and broadband light pollution for cleaner, higher-contrast results.\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\u003eAskar D2 Workflow: Adding the SII Channel to Your Data\u003c\/h3\u003e\n\u003cp\u003eIntegrating this filter into your imaging routine is straightforward. First, capture your primary data using a standard Hα\/OIII duo-band filter. Then, swap to the Askar Super D2 filter to capture the SII and OIII channels. In post-processing, you can combine the Hα from your first session with the SII from your second, and use the OIII data from whichever set is cleaner, giving you a complete H-S-O dataset. This two-filter approach is a powerful and cost-effective method for bringing monochrome-style palette flexibility to your color camera, and performs well even on fast optical systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the Askar 6nm D2 filter with my existing Hα\/OIII duo-band filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou use them in two separate imaging sessions. First, capture data with your Hα\/OIII filter. Then, without changing your framing, swap to the Askar D2 filter and capture more data for a similar total integration time. In processing, you will extract the Hα channel from the first session's data and the SII channel from the second session's data. You can then use the OIII data from either or both sessions to create a final SHO color image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Askar D2 filter's 6.5nm OIII and 8.5nm SII bandpasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e6.5nm OIII bandpass\u003c\/strong\u003e is very restrictive, which dramatically increases contrast and rejects moonlight or light pollution around the critical Oxygen-III lines. The slightly wider \u003cstrong\u003e8.5nm SII bandpass\u003c\/strong\u003e allows for a stronger signal from the typically fainter Sulfur-II line, helping to balance the data capture between the two wavelengths for better color results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar 6nm D2 filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is designed exclusively for astrophotography. Its bandpasses are extremely narrow (6.5nm and 8.5nm), and the human eye cannot gather enough light through such a restrictive filter to see anything. It requires long exposures with a camera to build up an image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Askar 6nm D2 filter work well with my f\/4 RASA or Hyperstar system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While not specifically designated as a \"high-speed\" filter, Askar has confirmed it performs well with fast optical systems. The filter's design minimizes the band-shifting effects that can occur with very fast focal ratios, ensuring you can still capture strong OIII and SII signals without significant transmission loss.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar D2 filter help me image targets like the Eagle Nebula (M16) in the Hubble Palette?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Eagle Nebula's \"Pillars of Creation\" are rich in all three narrowband gases. A standard duo-band filter captures the Hα and OIII, but misses the SII that traces the densest dust and ionization fronts. By using the Askar D2 filter, you capture that missing SII data, allowing you to assign Hα, SII, and OIII to the Red, Green, and Blue channels respectively in post-processing to create a vibrant, detailed SHO Hubble Palette image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the 1.85mm thickness of the Askar D2 filter make it parfocal with other brands?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1.85 ± 0.05mm\u003c\/strong\u003e thickness is very close to the standard used by many filter manufacturers. This means it should be nearly parfocal, requiring minimal to no refocusing when swapping between filters of a similar thickness. This is a significant advantage when conducting the two-session imaging workflow required for SHO with a color camera.\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\u003eDual-Band Narrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM (OIII)\u003c\/td\u003e\n\u003ctd\u003e6.5nm ± 0.5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM (SII)\u003c\/td\u003e\n\u003ctd\u003e8.5nm ± 0.5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelength (CWL)\u003c\/td\u003e\n\u003ctd\u003e500.7nm (OIII) \u0026amp; 672nm (SII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e≥85%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e≥OD5 @ 200-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm ± 0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30\"\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:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" 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 \u0026amp; Drivers\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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":47078711591197,"sku":"ASK-ASK2DNSOD2","price":447.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Color-Magic-D2-Filter.jpg?v=1699985639"},{"product_id":"askar-colour-magic-sii-oiii-c2-filter-2","title":"Askar Colour Magic SII\/OIII C2 Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual-band filter passing SⅡ (672nm) and OIII (500.7nm) emission lines\u003c\/li\u003e\n\u003cli\u003eDesigned for one-shot-color cameras to capture data often missed by Hα\/OIII filters\u003c\/li\u003e\n\u003cli\u003e15nm±3nm bandpass for the Sulfur-II (SⅡ) line\u003c\/li\u003e\n\u003cli\u003e35nm±5nm bandpass for the Oxygen-III (OIII) line\u003c\/li\u003e\n\u003cli\u003e90% peak transmittance for high signal-to-noise ratio\u003c\/li\u003e\n\u003cli\u003eOD3 blocking from 200-1000nm suppresses light pollution and unwanted signal\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\u003eAskar Colour Magic SII\/OIII C2 Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Askar Colour Magic C2 2\" filter isolates the Sulfur-II and Oxygen-III emission lines, capturing the \"missing\" SⅡ channel for one-shot-color camera users. With a tight 15nm±3nm bandpass at 672nm for SⅡ and a wider 35nm±5nm bandpass at 500.7nm for OIII, it achieves over 90% peak transmittance on these critical wavelengths. This design allows you to gather data for full SHO (Hubble Palette) style images without switching to a monochrome camera and filter wheel.\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 \"Missing Channel\" Solution: Adding SⅡ Data to Color Images\u003c\/h3\u003e\n\u003cp\u003eMost duo-band filters for color cameras focus on Hydrogen-alpha and Oxygen-III, leaving out the crucial Sulfur-II signal that reveals unique structures in many emission nebulae. The Askar Colour Magic C2 filter is engineered specifically to fill this gap. By capturing SⅡ and OIII simultaneously, it provides the data needed to complement your existing Hα\/OIII images, unlocking the ability to create full tricolor narrowband composites with a single color camera.\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\u003eAsymmetrical Design: 15nm SⅡ and 35nm OIII Bandpasses\u003c\/h3\u003e\n\u003cp\u003eThe filter features two different bandpasses to optimize signal capture for each emission line. The tighter 15nm±3nm FWHM for the SⅡ line provides excellent contrast and aggressively rejects light pollution for this often-fainter signal. The broader 35nm±5nm FWHM for OIII allows for greater light collection on this typically stronger signal, which is beneficial for reducing exposure times while still offering a significant improvement over broadband filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e90% Peak Transmittance for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eAchieving over 90% peak transmittance at the 672nm and 500.7nm center wavelengths ensures that the maximum amount of valuable nebula light reaches your sensor. Combined with strong out-of-band blocking rated at OD3 from 200-1000nm, the C2 filter darkens the sky background significantly, even under moderately light-polluted skies. This high transmission and strong blocking work together to dramatically increase image contrast, making faint details in targets like the Trifid Nebula (M20) or the Eagle Nebula (M16) stand out clearly.\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 Askar C2 SⅡ\/OIII filter instead of a standard Hα\/OIII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar C2 is not a replacement for an Hα\/OIII filter; it's a \u003cstrong\u003ecomplement\u003c\/strong\u003e. Standard duo-band filters capture Hα and OIII. The C2 filter captures SⅡ and OIII, providing the third channel of data necessary for creating Hubble Palette (SHO) images with a color camera. You use both filters to acquire all three datasets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I combine data from the Askar C2 filter with my other images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAfter capturing separate images with your Hα\/OIII filter and the Askar C2 SⅡ\/OIII filter, you would use image processing software like PixInsight or Photoshop. You can split the channels from each image to isolate the Hα, SⅡ, and OIII data, and then combine them into a single color image by assigning each signal to the Red, Green, and Blue channels as desired.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 35nm bandpass on the OIII channel of the Askar C2 filter wide enough for my light-polluted skies?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 35nm bandpass provides a good balance between light pollution suppression and signal strength. While not as restrictive as a 3nm or 7nm filter, it is significantly better than a broadband filter and is effective in most suburban environments. The key benefit is shorter exposure times compared to ultra-narrowband filters, which can be an advantage for many imagers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat types of celestial objects benefit most from the Askar C2 SⅡ\/OIII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEmission nebulae with distinct regions of Sulfur-II emission are ideal targets. Objects like the \u003cstrong\u003eEagle Nebula (M16)\u003c\/strong\u003e, the \u003cstrong\u003eTrifid Nebula (M20)\u003c\/strong\u003e, and the \u003cstrong\u003eRosette Nebula (NGC 2237)\u003c\/strong\u003e show dramatic structural differences when SⅡ data is included, allowing for the creation of vibrant and detailed Hubble Palette images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar C2 SⅡ\/OIII filter with a monochrome camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile technically possible, it's not the intended use. With a monochrome camera, the sensor would capture both SⅡ and OIII light simultaneously, and you would not be able to separate them. For monochrome imaging, it is always better to use individual SⅡ and OIII single-bandpass filters to capture clean, isolated data for each channel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are the bandpasses different for SⅡ (15nm) and OIII (35nm) on the Askar C2 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a deliberate design choice to optimize performance. The \u003cstrong\u003eSⅡ signal is often weaker\u003c\/strong\u003e, so a tighter 15nm bandpass is used to increase contrast and reject more background light. The \u003cstrong\u003eOIII signal is typically stronger\u003c\/strong\u003e, so a wider 35nm bandpass allows more of this signal to be collected, reducing exposure times without sacrificing too much contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eDual-Band Narrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelength (CWL)\u003c\/td\u003e\n\u003ctd\u003e500.7nm (OIII) \u0026amp; 672nm (SⅡ)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFull Width Half-Max (FWHM)\u003c\/td\u003e\n\u003ctd\u003eOIII: 35nm ±5nm \/ SⅡ: 15nm ±3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003eOD3 (0.1%) @ 200-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Thickness\u003c\/td\u003e\n\u003ctd\u003e2mm ± 0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003e60\/40\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\"\u003eAskar Colour Magic C2 SII\/OIII 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\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" 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 Drivers\/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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":47429342691613,"sku":"ASK-ASKAR2DBC2","price":167.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/image.png?v=1705009186"},{"product_id":"askar-colour-magic-sii-oiii-c1-filter-2","title":"Askar Colour Magic Ha\/OIII C1 Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual-bandpass filter for H-alpha (656.6nm) and Oxygen-III (500.7nm)\u003c\/li\u003e\n\u003cli\u003eAsymmetrical bandwidths: 15nm for H-alpha, 35nm for OIII\u003c\/li\u003e\n\u003cli\u003eGreater than 90% peak transmittance at primary emission lines\u003c\/li\u003e\n\u003cli\u003eOD3 (99.9%) blocking of light pollution from 200-1000nm\u003c\/li\u003e\n\u003cli\u003eStandard 2\" mounted format with 2mm thick substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\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\u003eAskar Colour Magic Ha\/OIII C1 Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Askar Colour Magic Ha\/OIII C1 filter isolates the two most important emission lines for nebula imaging, Hydrogen-alpha at 656.6nm and Oxygen-III at 500.7nm, with over 90% peak transmittance. Its design uses asymmetrical bandwidths—a tight 15nm±3nm for H-alpha and a wider 35nm±5nm for OIII—to capture strong signal from both wavelengths with a one-shot-color camera. By implementing OD3 blocking across the 200-1000nm spectrum, the C1 filter darkens the sky background for maximum image contrast, even from light-polluted locations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIsolate Ha \u0026amp; OIII with 90% Peak Transmittance\u003c\/h3\u003e\n\u003cp\u003eThe Colour Magic C1 is engineered to pass only the light from ionized hydrogen (Hα at 656.6nm) and doubly ionized oxygen (OIII at 500.7nm). With a peak transmittance of over 90% at these critical wavelengths, your camera sensor collects maximum signal from emission nebulae like the North American Nebula (NGC 7000) or the Veil Nebula complex, while rejecting unwanted city lights and natural skyglow.\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\u003eAsymmetrical Bandwidths: 15nm Ha and 35nm OIII for Color Balance\u003c\/h3\u003e\n\u003cp\u003eUnlike filters with identical bandwidths, the Askar C1 uses a purpose-built asymmetrical design. The H-alpha line is restricted to a tight 15nm±3nm bandpass for high-contrast detail in hydrogen-rich regions. The OIII bandpass is set to a much wider 35nm±5nm, allowing more signal to reach the sensor. This approach helps balance the often-weaker OIII signal against the typically dominant H-alpha, producing a richer, more natural color result directly from your one-shot-color (OSC) camera with less processing effort.\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\u003eOD3 Blocking for High-Contrast Images in Light Pollution\u003c\/h3\u003e\n\u003cp\u003eEffective imaging requires not just passing the desired signal, but aggressively blocking everything else. The C1 filter provides OD3 blocking, equivalent to rejecting 99.9% of incoming light, across a vast 200-1000nm range outside of its passbands. This comprehensive blocking eliminates interference from common sources of light pollution like sodium and mercury-vapor streetlights, as well as moonlight and general skyglow, producing a dark, neutral background and making nebula structures stand out with dramatic contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAskar C1 vs. Symmetrical Filters: A Design for OSC Imaging\u003c\/h3\u003e\n\u003cp\u003eMany popular dual-band filters use very narrow, symmetrical bandpasses (e.g., 7nm for both Ha and OIII). While those filters offer slightly higher contrast and produce smaller stars, the Askar C1's asymmetrical design presents a distinct advantage for OSC imagers.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompetitor Advantage:\u003c\/strong\u003e Symmetrical ultra-narrowband filters provide the highest possible contrast on individual emission lines and are ideal for monochrome imaging or advanced processing techniques where data from each line is handled separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAskar C1 Advantage:\u003c\/strong\u003e By widening the OIII band to 35nm, the C1 captures more OIII signal relative to Ha in the same exposure time. This helps prevent the final color image from being overwhelmingly red and yields a more balanced initial result, reducing the need for complex color calibration in post-processing.\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\"\u003eWhy does the Askar Colour Magic C1 filter have different bandwidths for H-alpha and OIII?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe asymmetrical design is a deliberate choice to improve color balance for one-shot-color (OSC) cameras. The \u003cstrong\u003e15nm H-alpha band\u003c\/strong\u003e provides high contrast, while the wider \u003cstrong\u003e35nm OIII band\u003c\/strong\u003e allows more of the typically weaker OIII signal to be captured. This helps prevent images from being overwhelmingly red and produces a more natural color result with less processing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar C1 filter perform in Bortle 8\/9 skies?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar C1 filter is highly effective in heavily light-polluted skies. Its \u003cstrong\u003eOD3 blocking\u003c\/strong\u003e across the 200-1000nm spectrum aggressively rejects common sources of urban light pollution. By only passing the specific 656.6nm and 500.7nm wavelengths of nebulae, it dramatically darkens the sky background, allowing you to capture high-contrast images of emission nebulae even from the city.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar C1 filter for imaging the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is not the right filter for broadband targets like galaxies or star clusters. The Askar C1 is a dual-bandpass filter that blocks almost all light except for specific emission lines. Since galaxies like M31 shine primarily in continuous-spectrum starlight, this filter would block the vast majority of their light, resulting in a very faint and incomplete image. A broadband light pollution filter is a better choice for galaxies from the city.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of color balance can I expect from the Askar C1 filter on the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn a target like the Orion Nebula (M42), which is rich in both hydrogen and oxygen, the Askar C1 filter is designed to deliver a well-balanced color image with an OSC camera. The tight 15nm band will capture fine details in the red H-alpha regions, while the broad 35nm OIII band will ensure the blue-green structures in the Trapezium core are bright and prominent, avoiding an overly red final image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar C1 filter suitable for monochrome cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it can be used, it's not ideal. A monochrome camera cannot separate the H-alpha and OIII signals captured simultaneously by the Askar C1 filter. For monochrome imaging, it is far more effective to use separate, dedicated H-alpha and OIII single-bandpass filters to capture data for each channel individually, allowing for full processing control and palette creation (like the Hubble Palette).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the OD3 @ 200-1000nm rating on the Askar C1 filter mean?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD3\u003c\/strong\u003e stands for Optical Density 3, which means the filter blocks 99.9% of light outside its designated passbands. The \u003cstrong\u003e@ 200-1000nm\u003c\/strong\u003e specification indicates this high level of blocking is applied across the entire spectrum from deep ultraviolet to near-infrared. This ensures a very dark, high-contrast background free from light pollution and other unwanted signals.\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\u003eDual-Bandpass Narrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength 1 (CWL)\u003c\/td\u003e\n\u003ctd\u003e656.6nm (H-alpha)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength 2 (CWL)\u003c\/td\u003e\n\u003ctd\u003e500.7nm (OIII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth (FWHM) H-alpha\u003c\/td\u003e\n\u003ctd\u003e15nm ± 3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth (FWHM) OIII\u003c\/td\u003e\n\u003ctd\u003e35nm ± 5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Efficiency\u003c\/td\u003e\n\u003ctd\u003eOD3 (99.9%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e200nm - 1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e2mm ± 0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003e60\/40\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\"\u003eAskar Colour Magic Ha\/OIII C1 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\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" 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 \u0026amp; Drivers\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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":47429347672349,"sku":"ASK-ASKAR2DBC1","price":167.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/image_8378cc30-ba51-4d4c-bfe1-c9fbd4710ebc.png?v=1705009394"},{"product_id":"askar-color-magic-ha-oiii-sii-oiii-c1-c2-filter-package","title":"Askar Colour Magic Ha\/OIII \u0026 SII\/OIII (C1+C2) Filter Package","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eComplete 2-Filter Narrowband Solution for Color Cameras\u003c\/li\u003e\n\u003cli\u003eCaptures H-alpha, Oxygen-III, and Sulfur-II Wavelengths\u003c\/li\u003e\n\u003cli\u003eFilter 1 (C1): Hα + OIII Duo-Band\u003c\/li\u003e\n\u003cli\u003eFilter 2 (C2): SII + OIII Duo-Band\u003c\/li\u003e\n\u003cli\u003eEnables Hubble Palette (SHO) Imaging with One-Shot-Color Cameras\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\u003eAskar Colour Magic Ha\/OIII \u0026amp; SII\/OIII (C1+C2) Filter Package\u003c\/h2\u003e\n\u003cp\u003eThe Askar Colour Magic C1+C2 Filter Package is a unique 2-filter system that enables imagers using one-shot-color cameras to capture all three key emission nebula wavelengths—H-alpha, Oxygen-III, and Sulfur-II. This package combines the C1 (Hα+OIII) and C2 (SII+OIII) duo-band filters, providing a direct and efficient path to creating full Hubble palette-style images, even from heavily light-polluted locations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 2-Filter Solution for Color Camera Narrowband Imaging\u003c\/h3\u003e\n\u003cp\u003eThis filter set fundamentally simplifies the process of tri-band narrowband imaging. Instead of requiring a monochrome camera, a filter wheel, and three separate filters (Ha, SII, OIII), the Colour Magic package allows you to achieve a similar result with your existing color camera and just two filters, drastically reducing complexity and cost.\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 C1 (Hα+OIII) Filter: Your Primary Nebula Workhorse\u003c\/h3\u003e\n\u003cp\u003eThe first filter in the set, the C1, is a duo-band filter that isolates the two most prominent wavelengths in most emission and planetary nebulae: Hydrogen-alpha and Oxygen-III. For many targets, this filter alone will produce dramatic, high-contrast images by rejecting broadband light pollution from city skies, revealing faint nebulosity that would otherwise be lost.\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 C2 (SII+OIII) Filter: Adding Critical Sulfur-II Data\u003c\/h3\u003e\n\u003cp\u003eThe C2 filter is the key to creating full SHO images. It captures the Sulfur-II line, which provides the rich reds and oranges in the Hubble palette, while also capturing more Oxygen-III signal. By capturing OIII data with both filters, you increase the total signal-to-noise ratio on this often-faint wavelength and create a common data layer that simplifies image registration and processing.\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\u003eColour Magic vs. Mono Imaging: A Streamlined Path to SHO\u003c\/h3\u003e\n\u003cp\u003eA traditional monochrome setup offers maximum control over data acquisition. You can use ultra-narrow filters and precisely control exposure time for each channel, which remains the standard for advanced scientific imaging.\u003c\/p\u003e\n\u003cp\u003eThe Askar Colour Magic system's advantage is workflow efficiency. It makes SHO imaging accessible to anyone with a color astronomy camera, eliminating the need for a filter wheel and the complexities of managing three separate data sets. While data from a duo-band filter is not as pure as from a dedicated mono filter, this package provides an innovative and highly effective way to produce stunning, colorful nebula portraits with far less equipment and acquisition time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the Askar Colour Magic filters to create an SHO image?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou capture two sets of exposures, one with the \u003cstrong\u003eC1 (Hα+OIII) filter\u003c\/strong\u003e and another with the \u003cstrong\u003eC2 (SII+OIII) filter\u003c\/strong\u003e. In post-processing, you will split the color channels from both data sets. The Red channel from the C1 data becomes your H-alpha, the Red channel from the C2 data becomes your Sulfur-II, and the combined Green\/Blue channels from both sets become your Oxygen-III. These three new monochrome images can then be assigned to the R, G, and B channels to create a Hubble palette image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Askar C2 filter include OIII data along with SII?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCapturing Oxygen-III data with both filters serves two purposes. First, it increases the total integration time and signal-to-noise ratio on the OIII signal, which is often the weakest of the three. Second, it provides a common structural element (the OIII nebulosity) in both of your master images, which makes aligning and registering the Hα and SII data much easier during processing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use just the Askar C1 (Hα+OIII) filter by itself?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The C1 filter is an excellent standalone duo-band filter for imaging most emission nebulae like the Orion Nebula (M42) or Lagoon Nebula (M8). It will produce high-contrast color images with natural-looking red and blue-green hues directly from your color camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Askar Colour Magic filters work with my 8\" f\/10 SCT on the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this filter set is well-suited for an f\/10 SCT. For the Orion Nebula (M42), you could use just the C1 (Hα+OIII) filter to capture its extensive hydrogen and oxygen structures with excellent contrast. Since M42 has very little Sulfur-II signal, using the C2 filter is not typically necessary for this specific target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this Askar filter set perform under my Bortle 7 city skies on the Pelican Nebula (IC 5070)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is an ideal scenario for the Colour Magic filters. From Bortle 7 skies, these filters will aggressively reject broadband light pollution, allowing your color camera to capture clean narrowband data. The Pelican Nebula (IC 5070) is rich in all three wavelengths (Ha, OIII, and SII), making it a perfect target to use both the C1 and C2 filters to create a detailed SHO Hubble palette image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo these Askar filters replace the need for a monochrome camera for narrowband?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor many amateur astrophotographers, yes. They provide a much simpler and more affordable way to get into tri-band narrowband imaging without investing in a full monochrome setup. While a mono camera offers more control and can use narrower bandpass filters for the absolute highest contrast, this Askar set closes the gap significantly and makes SHO imaging accessible to a much wider audience.\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\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" 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 \u0026amp; Drivers\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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":48554702995741,"sku":"ASK-CM-C1C2","price":315.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Color-Magic-Filter-Pack.png?v=1717083872"},{"product_id":"askar-6nm-colour-magic-super-ha-oiii-d1-filter","title":"Askar 6nm Colour Magic Super Ha\/OIII D1 Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual-Bandpass: 8.5nm H-alpha \u0026amp; 6.5nm OIII\u003c\/li\u003e\n\u003cli\u003ePeak Transmittance: \u0026gt;85% at 500.7nm and 656.6nm\u003c\/li\u003e\n\u003cli\u003eLight Pollution Suppression: ≥OD5 blocking from 200-1100nm\u003c\/li\u003e\n\u003cli\u003eOptical Integrity: 30\" Parallelism\u003c\/li\u003e\n\u003cli\u003eThickness: 1.85mm\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\u003eAskar 6nm Colour Magic Super Ha\/OIII D1 Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Askar Colour Magic Super D1 duo-narrowband filter isolates the two most important emission lines for nebula photography, with a 6.5nm bandpass for Oxygen III and an 8.5nm bandpass for Hydrogen-alpha. It delivers over 85% peak transmittance at its central wavelengths of 500.7nm and 656.6nm, ensuring strong signal capture from emission targets. With aggressive out-of-band blocking rated at ≥OD5 from 200-1100nm and a substrate parallelism of 30 arcseconds, this filter dramatically increases contrast and maintains sharp star profiles even in heavily light-polluted skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCapturing Ha and OIII with 85% Transmittance\u003c\/h3\u003e\n\u003cp\u003eThis filter is engineered to capture H-alpha and OIII data simultaneously, making it an ideal tool for one-shot color cameras. The 8.5nm bandpass for H-alpha and 6.5nm for OIII are tight enough to reject urban skyglow but wide enough to collect significant signal. With a peak transmittance of 85%, you can acquire deep, high-contrast images of emission nebulae like the Veil Nebula (NGC 6960) or the Rosette Nebula (NGC 2237) without excessively long exposure times.\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\u003eOD5 Blocking and 30\" Parallelism for Sharp Stars\u003c\/h3\u003e\n\u003cp\u003eThe optical quality of the Super D1 filter is defined by its rigorous specifications for blocking and physical precision. Its ≥OD5 blocking across the 200-1100nm spectrum effectively eliminates interference from sodium vapor lamps, LED streetlights, and natural skyglow, rendering the background sky nearly black. A 30\" parallelism tolerance ensures the filter surfaces are flat and parallel, preventing internal reflections and star distortions that can compromise the resolution of your main optics.\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 Signal Capture Down to f\/1.9\u003c\/h3\u003e\n\u003cp\u003eWhile not designated specifically as a high-speed filter, the Askar Super D1 has been tested to perform exceptionally well with fast optical systems. Its design minimizes the band-shifting effects that can cause signal loss when narrowband filters are used with fast focal ratios. This makes it a reliable choice for modern astrographs, refractors, and even ultra-fast systems like a Celestron RASA or a telescope equipped with a Starizona HyperStar, maintaining high contrast and signal down to f\/1.9.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main purpose of the Askar D1 Duo-Narrowband filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar D1 filter is designed for astrophotographers using \u003cstrong\u003eone-shot color (OSC) cameras\u003c\/strong\u003e in light-polluted areas. It allows you to capture two key nebula emission lines, H-alpha and OIII, in a single exposure, which dramatically increases image contrast and reveals details that would otherwise be lost to skyglow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are the H-alpha (8.5nm) and OIII (6.5nm) bandpasses on the Askar D1 different?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a deliberate design choice to balance signal strength with contrast. The tighter \u003cstrong\u003e6.5nm OIII bandpass\u003c\/strong\u003e provides excellent rejection of light pollution around that wavelength. The slightly wider \u003cstrong\u003e8.5nm H-alpha bandpass\u003c\/strong\u003e allows for slightly more signal collection, which can be beneficial for capturing fainter hydrogen structures in deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar D1 filter perform on the Orion Nebula (M42) with an f\/6 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt will perform exceptionally well. The Orion Nebula is extremely rich in both H-alpha and OIII emissions. The Askar D1 will isolate these signals, enhancing the red nebulosity and bringing out the blue-green structures in the core, all while suppressing skyglow. This allows for greater control over the bright Trapezium region while capturing the faint outer loops.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar D1 filter with a monochrome camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can, it's not the ideal application. A monochrome camera would capture both H-alpha and OIII signals on the same frame, preventing you from processing them separately. For monochrome imaging, using individual H-alpha and OIII filters provides far more flexibility and control over the final color image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar D1 suitable for my fast f\/2 RASA telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The filter's optical design has been tested to minimize band-shift and maintain high transmittance on systems as fast as \u003cstrong\u003ef\/1.9\u003c\/strong\u003e. This makes it a very capable choice for fast astrographs like the RASA, allowing you to take full advantage of the instrument's light-gathering power without significant signal degradation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar D1 filter control halos around bright stars?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHalos are minimized through a combination of factors. The \u003cstrong\u003e≥OD5 blocking\u003c\/strong\u003e and anti-reflection coatings reduce stray light, while the \u003cstrong\u003e30\" parallelism\u003c\/strong\u003e specification ensures that light passes through without creating internal reflections that can cause halos and other artifacts around bright stars.\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\u003eFWHM\u003c\/td\u003e\n\u003ctd\u003e8.5nm ± 0.5nm (H-alpha) \/ 6.5nm ± 0.5nm (OIII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelength (CWL)\u003c\/td\u003e\n\u003ctd\u003e656.6nm (H-alpha) \u0026amp; 500.7nm (OIII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e85%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003e≥OD5 @ 200-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85 ± 0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30\"\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\"\u003eAskar 6nm Colour Magic Super Ha\/OIII D1 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\"\u003ePlastic Protective Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" 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 Drivers \u0026amp; 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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":49387561124125,"sku":"ASK-ASK2DNHOD1","price":447.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Color-Magic-D2-Filter.jpg?v=1699985639"},{"product_id":"askar-3nm-colour-magic-ultra-ha-oiii-e1-filter-2","title":"Askar 3nm Colour Magic Ultra Ha\/OIII E1 Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual-bandpass for Hydrogen-alpha (656.6nm) and Oxygen-III (500.7nm)\u003c\/li\u003e\n\u003cli\u003eUltra-narrow 3.7nm (Ha) and 4.0nm (OIII) FWHM bandwidths\u003c\/li\u003e\n\u003cli\u003e85% peak transmittance at both center wavelengths\u003c\/li\u003e\n\u003cli\u003e≥OD5 blocking from 200-1100nm to suppress star halos\u003c\/li\u003e\n\u003cli\u003e2-inch mounted format with 1.85mm glass thickness\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\u003eAskar 3nm Colour Magic Ultra Ha\/OIII E1 Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Askar 3nm Colour Magic Ultra E1 filter isolates critical nebulae emission lines with its ultra-narrow 3.7nm Hydrogen-alpha and 4.0nm Oxygen-III bandpasses. It achieves a peak transmittance of 85% at both the 656.6nm and 500.7nm center wavelengths, maximizing signal capture from emission targets. With off-band blocking rated at ≥OD5 from 200-1100nm, this filter delivers exceptionally high-contrast images by suppressing light pollution, moonlight, and unwanted starlight.\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-Bandpass Imaging with 85% Peak Transmittance\u003c\/h3\u003e\n\u003cp\u003eDesigned for one-shot color cameras, the Ultra E1 captures the two most important emission lines simultaneously, drastically reducing total imaging time. By passing light at both 656.6nm (Ha) and 500.7nm (OIII) with 85% efficiency, you gather data for both the red and blue-green structures of targets like the Veil Nebula or the Rosette Nebula (NGC 2237) in a single set of exposures. This dual-band approach streamlines your workflow without compromising signal strength.\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\u003e3.7nm \u0026amp; 4.0nm Bandwidths for Extreme Light Pollution Rejection\u003c\/h3\u003e\n\u003cp\u003eThe defining feature of this filter is its extremely narrow full-width at half-maximum (FWHM). The 3.7nm band for Ha and 4.0nm for OIII aggressively reject unwanted light, including severe urban light pollution and natural skyglow. This surgical isolation of the nebula's signal creates a jet-black sky background, making faint, wispy details pop with dramatic contrast even from city backyards.\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\u003eOD5 Blocking and 30\" Parallelism for Halo-Free Stars\u003c\/h3\u003e\n\u003cp\u003eOptical precision extends beyond the passbands. The filter provides ≥OD5 blocking across the wide 200-1100nm spectrum, ensuring that stray UV and IR light, which can cause halos on bright stars, never reaches the sensor. A parallelism of 30 arcseconds guarantees the filter will not introduce distortions or degrade the sharpness of your optical system, maintaining pinpoint stars across the field of 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\u003eAskar 3nm Ultra vs. Wider Dual-Band Filters: Contrast and Star Size\u003c\/h3\u003e\n\u003cp\u003eCompared to filters with 7nm or wider bandpasses, the Askar 3nm Ultra E1 offers a significant advantage in signal-to-noise ratio under light-polluted skies. The trade-off for this extreme contrast is a slight reduction in star brightness and potentially longer sub-exposure times to achieve the same signal level.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAskar 3nm Ultra E1:\u003c\/strong\u003e Delivers maximum nebula contrast by eliminating more background light. It is the superior choice for imaging from Bortle 7-9 locations or during bright moon phases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider Dual-Band Filters:\u003c\/strong\u003e Capture signal faster and often produce smaller, more natural-looking stars, as very narrow filters can sometimes slightly bloat the brightest stars due to diffraction effects. They are excellent for dark sky sites where light pollution is less of a concern.\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\"\u003eIs the Askar 3nm Ultra E1 filter effective in Bortle 8 or 9 skies?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The ultra-narrow 3.7nm and 4.0nm bandwidths are specifically designed for this purpose. The Askar Ultra E1 excels at isolating the specific wavelengths of light from emission nebulae while aggressively blocking the broad-spectrum glow from city lights, making it one of the most effective tools for imaging from heavily light-polluted areas.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar 3nm Ultra E1 filter perform on the Trifid Nebula (M20) with my f\/7 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar Ultra E1 is an excellent choice for the Trifid Nebula (M20). It will cleanly separate the red hydrogen-alpha emission region from the blue-green oxygen-III structures with a one-shot color camera. In an f\/7 system, you won't have issues with band-shifting, and the filter's high 85% transmittance will help capture good signal despite the slower focal ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are the bandwidths for the Askar Ultra E1 filter different for Ha (3.7nm) and OIII (4.0nm)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a deliberate optical design choice. The OIII emission line is often fainter than Ha in many nebulae, so providing a slightly wider 4.0nm bandpass allows more OIII signal to be collected, helping to balance the final color image. The Ha line is typically stronger, so a tighter 3.7nm band can be used for maximum contrast without sacrificing too much signal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a monochrome camera to use the Askar 3nm Ultra E1 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is specifically designed for use with \u003cstrong\u003eone-shot color (OSC) cameras\u003c\/strong\u003e. It passes both red (Ha) and blue-green (OIII) light simultaneously, which are then captured by the corresponding pixels on your color sensor to create a rich color image with minimal processing effort.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the ≥OD5 blocking specification mean for my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD5 (Optical Density 5)\u003c\/strong\u003e means the filter blocks at least 99.999% of unwanted light outside its designated passbands. For astrophotography, this is critical for preventing halos around bright stars, which are often caused by out-of-focus UV and Infrared light that your telescope's optics were not designed to correct. This deep blocking ensures clean, high-contrast results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 2\" Askar Ultra E1 filter work with a full-frame sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 2-inch mounted format is designed to be large enough to fully illuminate full-frame sensors (36mm x 24mm) without vignetting, assuming it is placed correctly in the optical train, such as in a filter drawer or wheel close to the sensor.\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\u003eFWHM (Full-Width Half-Maximum)\u003c\/td\u003e\n\u003ctd\u003eHa: 3.7nm ± 0.3nm \/ OIII: 4.0nm ± 0.3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelength (CWL)\u003c\/td\u003e\n\u003ctd\u003e656.6nm (Ha) \u0026amp; 500.7nm (OIII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e≥85%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-Band Blocking\u003c\/td\u003e\n\u003ctd\u003e≥OD5 (Optical Density 5) @ 200-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85 ± 0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30 arcseconds\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\"\u003eAskar 3nm Colour Magic Ultra Ha\/OIII E1 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\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" 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 \u0026amp; Drivers\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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":50344440856861,"sku":"ASK-ASKAR2DBE1","price":847.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Colour-Magic-E1-Filter.jpg?v=1757644549"},{"product_id":"askar-3nm-colour-magic-ultra-oiii-sii-e1-filter-2","title":"Askar 3nm Colour Magic Ultra OIII\/SII E2 Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual-bandpass design captures OIII (500.7nm) and SII (672nm) simultaneously\u003c\/li\u003e\n\u003cli\u003eNarrow 3.7nm (OIII) and 4.0nm (SII) FWHM for high-contrast imaging\u003c\/li\u003e\n\u003cli\u003ePeak transmittance of 85% ensures high signal throughput\u003c\/li\u003e\n\u003cli\u003eDeep ≥OD5 blocking from 200-1100nm eliminates unwanted light pollution\u003c\/li\u003e\n\u003cli\u003eStandard 2\" filter format with 1.85mm substrate thickness\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\u003eAskar 3nm Colour Magic Ultra OIII\/SII E2 Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Askar 3nm Colour Magic Ultra OIII\/SII E2 Filter is engineered to solve a common problem for color camera imagers: capturing the full Hubble Palette. This dual-bandpass filter isolates nebula emissions at 500.7nm (OIII) and 672nm (SII) with narrow 3.7nm and 4.0nm bandpasses, respectively. With a peak transmittance of 85% and deep OD5 blocking across the 200-1100nm spectrum, this filter allows you to gather the missing Sulfur-II data needed for SHO compositions, even from light-polluted locations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 672nm + 500.7nm Solution for Color Camera SHO Imaging\u003c\/h3\u003e\n\u003cp\u003eWhile standard duo-narrowband filters for color cameras typically capture Hydrogen-alpha and Oxygen-III, they leave out the critical Sulfur-II signal. The Askar Ultra E2 filter is designed specifically to fill this gap. By passing light at 672nm (SII) and 500.7nm (OIII), it allows you to collect the remaining two channels for a full SHO dataset without a filter wheel or monochrome camera.\u003c\/p\u003e\n\u003cp\u003eCombine the data from this filter with Hydrogen-alpha data (captured separately or with an Hα\/OIII filter) to unlock vibrant, detailed SHO images. This approach makes the celebrated Hubble Palette accessible and efficient for anyone using a one-shot-color astronomy camera.\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\u003e3.7nm \u0026amp; 4.0nm Bandpasses for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eThis filter achieves its high contrast through extremely narrow full-width at half-maximum (FWHM) values: 3.7nm for OIII and 4.0nm for SII. These tight bandpasses aggressively reject streetlights, moonlight, and natural skyglow, causing faint nebula structures to stand out against a dark background. The ≥OD5 blocking from 200nm to 1100nm ensures no out-of-band wavelengths contaminate the image.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak Transmittance (85%):\u003c\/strong\u003e Despite the narrow bandpasses, the filter allows 85% of the crucial OIII and SII light to reach your sensor, preventing excessively long exposure times.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHalo Control:\u003c\/strong\u003e As part of Askar's \"Ultra\" series, this filter is optimized to minimize halos around bright stars, a common issue with narrowband filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Substrate:\u003c\/strong\u003e The filter is built on a glass substrate with a parallelism of 30 arcseconds, maintaining the sharpness of your optical system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary purpose of the Askar Ultra E2 OIII\/SII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar Ultra E2 is a specialized dual-narrowband filter designed for \u003cstrong\u003ecolor camera users\u003c\/strong\u003e who want to capture images in the Hubble Palette (SHO). It isolates the Oxygen-III (OIII) and Sulfur-II (SII) emission lines, allowing you to collect the \"S\" and \"O\" channels to complement your Hydrogen-alpha (\"H\") data.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I create an SHO image with the Askar Ultra E2 and a color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need to capture two sets of images. First, use a filter that passes Hydrogen-alpha (like an L-eXtreme, L-eNhance, or a dedicated Hα filter) to get your \"H\" data. Second, use this Askar Ultra E2 filter to capture your \"S\" and \"O\" data simultaneously. In post-processing, you will split the channels from both images and combine them using a tool like PixInsight's ChannelCombination to assign Hα to Red, SII to Green, and OIII to Blue (or any variation you prefer).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar Ultra E2 filter with a monochrome camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it is designed for color cameras, you can use it with a monochrome camera. However, because it passes both OIII and SII light at the same time, you cannot separate the two signals onto the mono sensor. For monochrome imaging, using individual OIII and SII filters is the standard and more flexible approach.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Askar Ultra E2 filter have 3.7nm and 4.0nm bandpasses instead of just \"3nm\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \"3nm\" is a class or series designation. The actual measured FWHM is \u003cstrong\u003e3.7nm ± 0.3nm for OIII\u003c\/strong\u003e and \u003cstrong\u003e4.0nm ± 0.3nm for SII\u003c\/strong\u003e. These precise, ultra-narrow bandpasses are what provide the exceptional contrast and light pollution rejection by isolating the specific nebula emission lines from background skyglow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Askar Ultra E2 filter perform on the Wizard Nebula (NGC 7380) from a city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Wizard Nebula (NGC 7380) is rich in all three SHO gasses. From a city, the Askar Ultra E2 filter's narrow 3.7nm\/4.0nm bandpasses would be highly effective at cutting through light pollution to reveal the intricate structures in the OIII and SII regions. It would darken the sky background significantly, increasing the contrast and making the faint nebulosity visible in your exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Askar Ultra E2 filter work well with my fast f\/4 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUltra-narrowband filters like this one can experience some band-shifting with very fast optical systems (typically f\/4 and below). While it will still provide a significant contrast boost, you may see a slight reduction in transmission compared to its peak 85% rating. The filter's performance is optimal for systems at f\/4.5 and slower, but it remains a powerful tool for light pollution suppression even on faster scopes.\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\u003eFWHM (OIII)\u003c\/td\u003e\n\u003ctd\u003e3.7nm ± 0.3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM (SII)\u003c\/td\u003e\n\u003ctd\u003e4.0nm ± 0.3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelength (CWL)\u003c\/td\u003e\n\u003ctd\u003e500.7nm (OIII) \u0026amp; 672nm (SII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e85%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Property\u003c\/td\u003e\n\u003ctd\u003e≥OD5 @ 200-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85 ± 0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30″\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\"\u003eAskar 3nm Colour Magic Ultra OIII\/SII E2 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\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" 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 \u0026amp; Drivers\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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":50344442036509,"sku":"ASK-ASKAR2DBE2","price":847.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Colour-Magic-E2-Filter.jpg?v=1757644814"},{"product_id":"askar-3nm-colour-magic-ha-oiii-sii-oiii-e1-e2-filter-package","title":"Askar 3nm Colour Magic Ha\/OIII \u0026 SII\/OIII (E1+E2) Filter Package","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnables SHO \"Hubble Palette\" imaging with a one-shot-color (OSC) camera\u003c\/li\u003e\n\u003cli\u003eIncludes two 3nm dual-bandpass filters: E1 (Hα+OIII) and E2 (SII+OIII)\u003c\/li\u003e\n\u003cli\u003eIsolates all three key emission lines (H-alpha, O-III, S-II) across two exposures\u003c\/li\u003e\n\u003cli\u003e\"Ultra E\" design provides advanced halo suppression around bright stars\u003c\/li\u003e\n\u003cli\u003eMaximizes contrast for deep-sky imaging from light-polluted locations\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\u003eAskar 3nm Colour Magic Ha\/OIII \u0026amp; SII\/OIII (E1+E2) Filter Package\u003c\/h2\u003e\n\u003cp\u003eThe Askar 3nm Colour Magic Filter Package uses two distinct 3nm dual-bandpass filters to let you capture all three key narrowband emission lines required for Hubble Palette images with a single color camera. This two-filter system, consisting of the E1 (Hα+OIII) and E2 (SII+OIII) filters, isolates data from hydrogen, oxygen, and sulfur, creating a streamlined workflow that was previously only possible with a monochrome camera and filter wheel.\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 3nm Colour Magic System: SHO Palette Imaging with Your OSC Camera\u003c\/h3\u003e\n\u003cp\u003eThis filter set fundamentally changes the capability of a one-shot-color (OSC) camera. By separating the H-alpha and SII signals into two different filters—while capturing OIII data with both—you can effectively assign each channel to a specific color in post-processing to create SHO images.\u003c\/p\u003e\n\u003cp\u003eThe tight 3nm bandpass on each emission line aggressively rejects light pollution, moonlight, and atmospheric airglow. This dramatically increases the contrast between your target nebula and the sky background, allowing you to capture faint, detailed structures even from suburban locations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFilter E1 (Hα+OIII): Capturing a 3nm Signal from Hydrogen and Oxygen\u003c\/h3\u003e\n\u003cp\u003eThe E1 filter is the primary data-gathering tool in the set, capturing simultaneous 3nm signals from the two most dominant emission lines in most nebulae: Hydrogen-alpha (Hα) and Oxygen-III (OIII). When used with an OSC camera, Hα data is recorded by the red pixels, while OIII is recorded by the green and blue pixels.\u003c\/p\u003e\n\u003cp\u003eThis filter can be used on its own for high-contrast, bi-color images of targets like the Veil Nebula or the North American Nebula (NGC 7000). The \"Ultra E\" engineering specifically targets and suppresses halos around bright stars, ensuring clean data without distracting artifacts.\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\u003eFilter E2 (SII+OIII): Adding a 3nm Sulfur Channel for Structure\u003c\/h3\u003e\n\u003cp\u003eThe E2 filter completes the trio by isolating the Sulfur-II (SII) and Oxygen-III (OIII) lines within a 3nm bandpass. The SII signal, recorded by your camera's red pixels, often reveals different structures in nebulae compared to H-alpha, adding depth and detail to the final composite image.\u003c\/p\u003e\n\u003cp\u003eBy capturing OIII data again with this filter, you increase the total signal-to-noise ratio on the faintest OIII regions. In processing, you combine the data from both filters, using the red channel from the E1 exposure for Hα, the red channel from the E2 for SII, and the combined blue\/green channels from both exposures for OIII.\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\u003eColour Magic vs. Mono SHO: A Streamlined Two-Filter Workflow\u003c\/h3\u003e\n\u003cp\u003eThis two-filter system presents a powerful alternative to a traditional monochrome imaging setup for creating Hubble Palette images. It eliminates the need for a filter wheel and the complexity of managing three separate single-bandpass filters.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvantage Askar:\u003c\/strong\u003e You can capture all the necessary data in just two imaging sessions instead of three, saving valuable clear-sky time. The workflow is simpler, requiring less equipment and fewer steps to achieve a full SHO color image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvantage Monochrome:\u003c\/strong\u003e A dedicated monochrome camera with separate R, G, B, and narrowband filters will still offer the highest possible resolution, as it avoids the color interpolation of an OSC sensor's Bayer matrix. However, this comes at a significantly higher cost and complexity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor the OSC imager who wants to create dynamic, detailed SHO images without investing in a completely new camera and filter system, the Askar 3nm Colour Magic package is the most direct path.\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 Askar 3nm Colour Magic filter set work with a color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar Colour Magic set uses two filters to isolate the three main narrowband emission lines. First, you image with the \u003cstrong\u003eE1 (Hα+OIII) filter\u003c\/strong\u003e, which puts H-alpha light on your camera's red pixels and O-III light on the blue and green. Then, you switch to the \u003cstrong\u003eE2 (SII+OIII) filter\u003c\/strong\u003e, which puts Sulfur-II light on the red pixels and more O-III on the blue and green. In processing software, you can then separate these channels to create a full SHO (Hubble Palette) image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of splitting SII and Hα into two separate Askar filters (E1 and E2)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy placing H-alpha and Sulfur-II on separate filters, the Askar Colour Magic system allows you to isolate them cleanly using only the red pixels of your color camera. Standard \"tri-band\" or \"quad-band\" filters often capture both Hα and SII signals on the red pixels simultaneously, making it impossible to separate them for SHO color mapping. This two-filter approach is the key to achieving true Hubble Palette images with an OSC camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat processing is required to create a Hubble Palette image of the Eagle Nebula (M16) with the Askar Colour Magic filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAfter capturing data with both the E1 and E2 filters, you would use a program like PixInsight or Siril. The basic steps are:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSplit Channels:\u003c\/strong\u003e Separate the RGB channels from both your E1 master file and your E2 master file.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssign Channels:\u003c\/strong\u003e The Red channel from your E2 image becomes your \u003cstrong\u003eSulfur (S)\u003c\/strong\u003e. The Red channel from your E1 image becomes your \u003cstrong\u003eHydrogen (H)\u003c\/strong\u003e. The Blue and Green channels from both images are combined to create your \u003cstrong\u003eOxygen (O)\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCombine:\u003c\/strong\u003e Use a channel combination tool to map S, H, and O to the Red, Green, and Blue channels of a new color image, respectively.\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 Askar Colour Magic set better than a single duo-band filter like an L-eXtreme?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThey serve different purposes. A standard duo-band filter is excellent for creating dramatic bi-color (red and teal) images with a single filter. The \u003cstrong\u003eAskar 3nm Colour Magic set\u003c\/strong\u003e is specifically designed for tri-color Hubble Palette (SHO) imaging. If your goal is to create images with the distinctive gold-and-blue look of the Hubble Space Telescope, the Colour Magic set is the superior choice as it allows you to isolate the critical SII signal that duo-band filters cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar Colour Magic E1 (Hα+OIII) filter by itself for imaging the Cygnus Loop?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The E1 filter functions as a high-performance 3nm duo-narrowband filter on its own. It is perfect for capturing high-contrast images of targets rich in Hydrogen and Oxygen, such as the Cygnus Loop (Veil Nebula), the Crescent Nebula (NGC 6888), or the North American Nebula (NGC 7000).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the limitations of the Askar Colour Magic system compared to a monochrome camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary limitation is resolution. A one-shot-color camera uses a Bayer matrix, meaning only one-quarter of its pixels are sensitive to red light. Since both Hα and SII signals are captured by these red pixels (in separate exposures), the effective resolution for those channels is lower than what a monochrome camera, where every pixel is used for every filter, can achieve. However, for many imagers, the convenience and reduced cost of the Colour Magic system outweigh this difference.\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\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" 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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":50344447410461,"sku":"ASK-CM-E1E2","price":1678.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Colour-Magic-E1-E2-Filter-Package.jpg?v=1757644982"}],"url":"https:\/\/davidastro.com\/collections\/askar-dual-band-filters.oembed","provider":"David Astro","version":"1.0","type":"link"}