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. The filters are optimized for use with focal ratios of f/4 to f/15. Because of the high transmission, the UHC filter provides enough light to successfully observe deep-sky objects with smaller telescopes. Due to the strong reduction of the sky background, gas and planetary nebulas are visible with an unexpected abundance of detail. 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. It lets almost 100-percent of the radiation from both O-III lines and the H-beta line pass through. The filter corrects the displaced colour reproduction of a converted camera so that it can also be used for normal every-day photography, without having to revise every image on the computer.The 2-Inch UHC Filter for Visual Use by Astronomik: The Astronomik Ultra High Contrast filter is for visual deep-sky observation.
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