Focus Scientific

Astronomik UHC (Ultra High Contrast) Filter (2\")

You will enjoy using your Astronomik UHC filter because you will see more stars and more details in deep-sky objects compared to using filters from all other manufacturers.

The Astronomik UHC (Ultra High Contrast) filter allows the transmission of nearly 100% of the radiation from both O-III and the H beta lines. Though the second window for the H-alpha line is not intended for visual observing, it is important if the filter is used with an electronic device. All annoying, scattered light from other wavelength sources, including local artificial light pollution, is reliably filtered out. With this strong blocking of the sky background an unexpected wealth of detail becomes visible for emission nebulae and planetary nebulae.

The Astronomik UHC filter's astounding high light transmission brings better views of deep-sky objects even to small telescopes! The high transmission of our optical glass filters means that enough light is available to allow successful visual observations with telescopes beginning at 2" (50mm) aperture. Our Astronomik filters are optimized for use with telescope focal length f/ ratios of f/4 to f/15. Transmission losses and chromatic distortions, which arise with other filters, only occur with Astronomik filters when extremely bright aperture ratios of f/2 and more come into play. Another major advantage of our Astronomik UHC filter is the high optical quality of the filter glass. When using Astronomik UHC filters you will quickly notice the same needle-sharp stars which you are familiar with from your astronomical instrument without any filter!

This filter is not for solar observation.

Price does not include shipping from Germany, which is separate from the possible free shipping from us to you. You will be notified of these shipping charges prior to payment being taken.


  • Transmission of nearly 100% of O-III and H-beta
  • Transmission of 96% of H alpha
  • Entire blocking of annoying wavelengths
  • Ideal all-around deep-sky filter even for small telescopes
  • parfocal with other Astronomik filters
  • Diffraction limited, the filter will not reduce the optical performance of your telescope
  • Thickness: 1mm
  • Not sensitive to moisture, scratch resistant, non-aging
  • High quality storage box
  • Made in Germany