Astronomik H-Alpha 12nm CCD Filter - Canon EOS APS Clip
The Astronomik H-alpha filter is a narrow band filter for CCD photography. The filter lets the H-alpha light of emission nebulae pass and blocks nearly the whole remainder of the spectrum where the CCD is sensitive.
The full width at half-maximum (FWHM) of 12nm is optimized for the use with common CCD cameras and allows the use of very fast optics. It should be noted that the filter has a transmission of up to 99%. Another advantage of the 12nm filters is the availability of guiding stars for cameras with a built-in-autoguider (SBIG). If you use a very strong filter like our 6nm filter you often won’t find a usable guidestar.
The range of application extends from 1:2.8 to 1:15. Transmission losses and chromatic distortions, which arise with other filters, only occur with Astronomik filters when extremely bright aperture ratios of 1:2 and more come into play.
The Astronomik H-alpha-CCD (12nm version) increases the contrast between objects, in this case between the H-alpha emission line and the skyglow background. Our Astronomik H-alpha-CCD (12nm version) completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow. When using the OIII CCD and the SII-CCD filters you can obtain three-color images of emission line objects (gas nebulae) from locations with very strong light pollution. To do so, you would take an image in three different wavelengths, select each one as a color-channel in Photoshop and paste them together as a color image. The Astronomik H-Alpha filter may NOT be used for solar observation. f you plan to create color images from emission line data, our CLS-CCD filter is a great choice for the Luminance channel.
About the Astronomik Clip-Filter System....
The patented Astronomik Clip-Filter System is black anodized aluminum and laser-cut on state-of-the-art modern machines. It can be inserted within seconds directly into the EOS camera body. There are no changes necessary and all lens functions (focus, screen, image stabilization) remain functional!
Almost all Canon system lenses (with the exception of the EF-S series) and all M42 and T2 lens adapters, can be used with the Astronomik Clip-Filter System. The Clip-Filter System also acts as an outstanding dust shield, which prevents the possibility of dust settling on the sensor during long time exposure (The MC-Clear filter does not have a filter effect and only acts as a dust shield.)
Note: For Photographers interested in daylight IR-Photography a "MC-modification" is possible for some cameras. If you are interested in this, please send us a short mail. We will give you more details. The "MC-modification" gives you no advantage for normal astrophotography! If you have a full-frame EOS camera, like the 5D or 6D, you should buy the Astronomik H-Alpha 12nm XL EOS Clip Filter instead.
Astronomik H-Alpha 12nm CCD Filter - Canon EOS Clip Features
- Transmission of over 97% with the H-alpha line (656nm)
- Complete blocking from all disturbing wavelengths in the infrared
- Parfocal with other Astronomik filters
- Glass thickness: 1mm
- Completely resistant against high humidity, scratches and aging effects
- Diffraction limited, the filter will not reduce the optical performance of your telescope!
- Astronomik filters are delivered in a high-quality, long lasting, filter box
Astronomik Product Number: HA12-EOS
- Additional Information
SKU AK-HA12-EOS Manufacturer Astronomik Type of Filter H-Alpha Filter Usage Imaging Single or Set? Single Filter Filter Size EOS Clip Filter Shape EOS Clip Filter Mounted? Mounted Warranty 10 Year Warranty
- Included Items
- Astronomik 12nm H-Alpha CCD Filter for Canon EOS Cameras
- Plastic Storage Case
- Questions & Answers
Product QuestionsQuestion by: sandro on Jan 3, 2015 3:07:53 AMAbsolutely!
You will find that it is best to use the longest exposure-times that your mount and temperatures (relative to noise-levels) will allow... but that's due to how faint the Hydrogen signal from most subjects is, combined with some of that light being blocked by your cameras hot-mirror (infra-red blocking filtration over the CMOS sensor). That qualification out of the way, this filter will make it a lot more fun to shoot many emission nebulae while the moon is up!!!
You can go back to get the RGB data during new-moon :-)Answer by: Eric_B (Admin) on Jan 4, 2015 12:04:43 PMI have a Canon 450D, modified for astrophotography. Is there any problem with using this filter in addition to the UV/IR block filter installed? Would that be overkill? I live in a big city and want to cut the light pollution in my images.Question by: Teresa Herlinger on Apr 2, 2016 11:43:00 PMThis filter should work great with your modified camera. The H-alpha line is deep-red, but should not see cut from the UV/IR cut filter used during an astro-mod. It's far from overkill... in a way they compliment each other. It may also be worth considering one of the narrower band-pass (6NM) versions, as such would offer even more improvement in contrast under light-polluted skies.Answer by: Eric Blackhurst (Admin) on Apr 5, 2016 12:22:00 PM
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