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Astronomik H-Alpha 12 nm EOS Clip Filter - HA12-EOS

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SKU: ASF-HA12-EOS

Astronomik H-Alpha 12 nm EOS Clip Filter


  • The Astronomik H-Alpha EOS Clip Filter is a photographic filter in an EOS Clip frame format
  • Made to the highest technical standards to provide the best optical performance for deep sky imaging with your Canon EOS camera
  • Allows H-Alpha emission nebulae to pass while blocking almost the complete remainder of the visual spectrum as well as IR
  • The Astronomik H-Alpha EOS Clip Filter has a FWHM of about 12 nm
  • Ideal for planetary nebulae and supernova remnants, and it blocks all unwanted light pollution
  • Made in Germany, a country renowned for producing superior quality optics!


More About the Astronomik H-Alpha 12 nm EOS Clip Filter


The Astronomik H-Alpha 12 nm EOS Clip Filter is the perfect narrowband filter for deep sky astrophotography with Canon EOS cameras. A full width at half maximum (FWHM) of 12 nm is optimal for Canon cameras, permitting the use of extremely fast optics. The f/number application range extends from 1:2.8 to 1:15. Transmission losses and chromatic distortions, which can be a problem with other filters, only crop up when super bright aperture ratios of 1:2 and more are involved. Other advantages of this filter include an up to 99% transmission and good guide star availability for cameras with a built-in autoguider.

The contrast between objects with H-Alpha emission lines and the airglow background is increased by the Astronomik H-Alpha EOS Clip Filter. This filter completely suppresses artificial emission lines such as those from mercury and sodium-vapor, as well as airglow, making it a great filter for opposing light pollution! Due to the high optical quality of the H-Alpha EOS Clip Filter's substrate, you will see the same razor sharp stars you would see from your regular telescope.

Delivered in a high-quality, long-lasting plastic storage container, the Astronomik H-Alpha 12 nm EOS Clip Filter is parfocal with all other Astronomik filters. It completely blocks all unwanted wavelengths in the visible and IR bands of the spectrum. This filter has a very thin substrate and is diffraction limited for maintaining the quality of fine images from your telescope. In addition, it offers very high resistance to impurities caused by scratching, aging, and high humidity.

Astronomik EOS Clip Filter System

Astronomik's patented Clip Filter has been assembled from black anodized aluminum and laser-cut on the most advanced modern machines. Within seconds, it can be placed straight into the EOS camera body. No changes required and all lens functions (focus, screen, image stabilization) remain operational! Nearly all Canon system lenses (save for the EF-S series) and all M42 and T2 lens adapters, work with the Astronomik Clip-Filter. This system also serves as an excellent dust protector, preventing it from gathering on the sensor during long exposures.

Transmission Specifications


  • 97+% transmission for the H-Alpha line
  • Blocks nearly the whole remainder of the visual spectrum
  • Blocks unwanted wavelengths in the infrared


Please note this filter must NEVER be used for solar observing or imaging. Doing so will cause permanent damage to your eyes.

List of Compatible Canon EOS Cameras

Canon EOS
 Suitable for Clip-Filter? 
 LiveView? 
7D MkII
Yes
Yes
7D
Yes
Yes
20D
Yes
No
20Da
Yes
Yes
30D
Yes
No
40D
Yes
Yes
50D
Yes
Yes
60D + 60Da
Yes
Yes
70D
Yes
Yes
77D
Yes
Yes
80D
Yes
Yes
300D / Digital Rebel / Kiss Digital
Yes
No
 350D / Digital Rebel XT / Kiss Digital N 
Yes
No
 400D / Digital Rebel XTi / Kiss Digital X 
Yes
No
450D / Rebel XSi / Kiss X2
Yes
Yes
500D / Rebel T1i / Kiss X3
Yes
Yes
550D / Rebel T2i / Kiss X4
Yes
Yes
600D / Rebel T3i / Kiss X5
Yes
Yes
650D / Rebel T4i / Kiss X6
Yes
Yes
700D / Rebel T5i / Kiss X7
Yes
Yes
750D / Rebel T6i / Kiss X8
Yes
Yes
760D / Rebel T7i / Kiss X9
Yes
Yes
1000D / Rebel XS / Kiss F
Yes
Yes
1100D / Rebel T3 / Kiss X50
Yes
Yes
1200D
Yes
Yes
1300D
Yes
Yes
2000D
Yes
Yes
100D
Yes
Yes
200D
Yes
Yes