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Astronomik H-Alpha 12 nm CCD Filter - 50 mm Square - HA12-50SQ

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SKU: ASF-HA12-50SQ

Astronomik H-Alpha 12 nm CCD Filter - 50 mm Square


  • 50 mm x 50 mm square photographic filter
  • Designed with the highest technical standards in mind to ensure the ideal optical performance for deep sky CCD imaging
  • Lets favorable H-Alpha emissions pass through while blocking almost the entire remainder of the visual spectrum including IR
  • 12 nm FWHM bandwidth
  • Optimally equipped for planetary nebulae and supernova remnant imaging
  • Made in Germany, a country known for creating optics of high quality


More About the Astronomik 50 mm Square H-Alpha 12 nm CCD Filter


This Astronomik 50x50 mm H-Alpha 12 nm CCD Filter is the optimal narrowband filter for CCD astrophotography. With a 12 nm FWHM, this filter is ideal for standard CCD cameras, allowing very fast optics to be employed. The f/number application range is spread from 1:2.8 to 1:15. The only time you'll have to be concerned with transmission losses and chromatic distortions, which can be an issue with other filters, is when excessively bright aperture ratios of 1:2 and more are involved. It should also be acknowledged that this filter has an up to 99% transmission. An additional asset of this 12 nm filter is the more convenient availability of guiding stars for cameras with an integrated autoguider.

The contrast between objects with H-Alpha emission lines and the skyglow background is enhanced by the Astronomik H-Alpha CCD Filter. In addition, this filter completely cuts off light from spurious sources such as the mercury and sodium-vapor lines from street lamps, making it an outstanding light pollution filter! Due to the Astronomik CCD H-Alpha substrate's high optical quality, you'll see the same razor sharp stars you'd see if you were using your regular telescope.

This 50 mm Square H-Alpha 12 nm CCD filter from Astronomik completely obstructs all undesired wavelengths in the visual and IR spectral areas. Like all Astronomik filters, it is parfocal with all other Astronomik filters. It contains a very thin substrate and is diffraction limited for maintaining your telescope's optical performance. This filter is also entirely resistant to scratching as well as the effects of high humidity and aging. Astronomik filters arrive in a durable plastic storage container of excellent quality.

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.