Astronomik H-alpha 12 nm MaxFR Clip-Filter EOS APS-C (Astronomik, SKU: 10201220) is a narrowband filter for imaging hydrogen nebulae and HII regions in the H-alpha line. Selective transmission increases the contrast of the nebular signal by reducing unwanted background light at both dark and light-polluted sites. The Clip-Filter EOS APS-C version is designed to fit inside a compatible camera body.
• narrow 12 nm passband that increases nebula-to-background contrast
• blocking of unwanted out-of-band radiation, including UV and IR
• use with CMOS and CCD cameras to record a separate emission-line channel
• wider passband than 6 nm filters helps retain more guide stars
• the filter must not be used for solar observation
• installation and removal of the Clip-Filter without modifying the camera body or using additional tools
• coatings: MaxFR, designed for fast optical systems; also usable with slower instruments
• optically polished glass and durable coatings resistant to scratches and humidity
• one Astronomik filter in the specified version, SKU: 10201220
• protective storage box
• manufacturer: Astronomik
• manufacturer SKU: 10201220
• filter type: H-alpha narrowband
• emission line: 656 nm
• full width at half maximum (FWHM): 12 nm
• guaranteed transmission for the H-alpha line at 656 nm: over 90%
• typical transmission for the H-alpha line at 656 nm: 96%
• out-of-band blocking: from UV to IR
• coatings: Astronomik MaxFR
• fast-optics range without significant transmission loss: f/1.7–f/6
• transmission relative to maximum at f/1.4: approximately 85%
• mounting: Clip-Filter EOS APS-C
• compatible Canon EOS cameras: 7D, 7D Mark II, 20D, 20Da, 30D, 40D, 50D, 60D, 60Da, 70D, 77D, 80D and 90D
• compatible Canon EOS cameras: 100D, 200D, 250D, 300D, 350D, 400D, 450D, 500D, 550D, 600D, 650D, 700D, 750D, 760D, 800D and 850D
• compatible Canon EOS cameras: 1000D, 1100D, 1200D, 1300D, 1500D/2000D and 4000D/3000D; also the regional Rebel and Kiss equivalents of the listed models
• additional application: EOS M cameras when the filter is installed in the original Canon EF-EOS M adapter
• not compatible with original Canon EF-S lenses or EOS-1D and EOS 5D bodies
• cell: black-anodised aluminium
• glass thickness: 1 mm
• parfocality: with Astronomik filters with 1 mm glass thickness
• country of manufacture: Germany
The H-alpha filter records a selected component of nebular emission as a separate channel for further processing or a multiband composite.
