![]() Visual observation (dark skies): Very good, for telescopes of all apertures and high exit pupil.The major emission lines of artifical light pollution: The most important lines are from ionized Hydrogen (H-alpha and H-beta) and The most important emission lines from nebulas are shown in green.Which are used in nearly all streetlights. The artifical light pollution is dominated by see mercury (Hg) and sodium (Na), The most important artifical emission lines are shown in orange.Photographic filters: The grey line in the background shows the sensitivity of a typical CCD sensor.You can easily see, that you can´t see anything of the H-alpha line at night (even if you can during daylight!) The sensitivity at The maximum is at ~510nm and drops to longerĪnd shorter wavelengths. Visual filters: The grey line in the background shows the relative sensitivity of the human eye at night.The red line shows the transmission of the filter.The transmission in % is plotted on the vertical axis.The famous "H-Alpha" emission line of hydrogen. 400nm is deep blue, at 520nm the human eye senses green and at 600nm red. The horizontal axis is the Wavelength in Nanometers (nm).More information about the visual Astronomik filters 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! Another major advantage of our Astronomik UHC filter is the high optical quality of the filter glass. Transmission losses and chromatic distortions, which arise with other filters, only occur with Astronomik filters when extremely bright aperture ratios of 1:2 and more come into play. Our Astronomik filters are optimized for use with telescope focal length f / ratios of f/4 to f/15. Main useĪstronomik UHC filters’ 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. With this strong blocking of the sky background an unexpected wealth of detail becomes visible for gas nebulae and planetary nebulae. All annoying, scattered light from other wavelength sources, including local artificial light pollution, is reliably filtered out. 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. 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. 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 most important lines are from ionised Hydrogen (H-alpha and H-beta) and double ionised oxygen (OIII).The Astronomik UHC is THE filter for visual observing. The most important emission lines from nebulas are shown in orange.The blue line shows the transmission of the filter.The transmission in % is plotted on the vertical axis.At 656nm is the famous "H-Alpha" emission line of hydrogen. ![]() ![]()
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