Astronomik UHC Visual Filter - 1.25" Round Mounted

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Astronomik UHC Visual Filter - 1.25" Round Mounted
Item # AK-UHC-1
  • This Astronomik UHC Filter is a great visual filter crafted from a German manufacturer and mounted in a 1.25" machined cell.
  • With a high transmission of nearly 100% of H-Beta and OIII lines, you will experience more detail in gas and planetary nebulae.
  • The Astronomik UHC Filter is amazingly scratch-resistant, and has a five year warranty.


Astronomik 1.25" UHC Filter for Visual Use

The Astronomik UHC filter is for visual deep-sky observation. It lets almost 100% of the radiation from both O-III lines and the H-beta line pass through. A second bandpass for the H-alpha line ensures that this radiation also reaches the eye, and scattered light from other wavelength ranges is also filtered out. Due to the strong reduction of the sky background, gas and planetary nebulas are visible with an unexpected abundance of detail. Because of the high transmission, the UHC filter provides enough light to successfully observe deep-sky objects with smaller telescopes.

The filters are optimized for use with focal ratios of f/4 to f/15. Unlike other filters on the market, loss of transmission and color displacement with the Astronomik filter occurs only on telescopes with extremely fast focal ratios of f/3 on up. Compared to the UHC filters sold by other manufacturers, the Astronomik UHC filter shows you more stars and more details in nebulas, and because of the high quality of the glass, you will see stars as small pinpoints.

Astronomik filters are in a class by themselves when compared to other filters made by Japanese and US manufacturers. The coatings are completely sealed and insensitive to moisture. They do not change with the years, but keep their transmission characteristics indefinitely. The coatings are so hard that is it not possible to scratch them by mistake. You would have to rub them with sandpaper to get even the finest of scratches! Due to these outstanding characteristics, Astronomik gives them a 5 year guarantee. Each filter will be sent in a useful protective case.

Astronomik 1.25" UHC Filter for Visual Use Features

  • Transmission of nearly 100% of O-III and H-beta
  • Transmission of 96% of H alpha
  • Entire Blocking of annoying wavelengths
  • Ideal All-round Deep Sky filter even for small telescopes
  • Not sensitive to humidity or aging
  • Scratch-resistant!
  • Excellent carrier material. The optical performance of your telescope is not reduced by the filter in any way.
  • 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
Additional Information

Additional Information

Manufacturer Astronomik
Type of Filter Contrast Booster
Filter Usage Imaging, Visual
Single or Set? Single Filter
Filter Size 1.25"
Filter Shape Round
Filter Mounted? Mounted
Warranty 10 Year Warranty
Peak Transmission Transmission of 96% of H alpha

Customer Reviews 1 item(s)

A very nice filter indeed. I don't have competing brands of uhc filters to compare with. In contrast to Deep Sky, Sky Glow and O-III filters this one does in fact have best performance with my smaller aperature scopes as advertised. Really takes care of light pollution from Yakima sky and neighborhood outdoor lighting. Lagoon Nebula was barely resolved without any filters. Installed this UHC filter in eyepiece and looked again. SHAZAAM! What a view!! I am happy with Astronomik UHC filters performance and would give a thumbs up to them for a very good product that does what they publish. Very dark sky background and planetaries really jump out with nice tight stars. A quality German product for sure. I will use this one quite a bit.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Matthew Stephens Yakima, Wa. / (Posted on 6/26/2009)
Included Items

Included Items

  • Astronomik 1.25" UHC Filter for Visual Use
  • Protective Plastic Case
Questions & Answers

Product Questions

( Transmission nearly 100% of oxygen and h-beta lines ) does this sentence mean that the maximum light transmission of this filter is more than 99%
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