Astronomik UHC Ultra High Contrast Filter - 36mm Round Unmounted

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Astronomik UHC Ultra High Contrast Filter - 36mm Round Unmounted
Item # AK-UHC-36
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  • This Astronomik UHC Filter is great for visual deep sky observation as well as some imaging applications.
  • This model of the UHC Filter is 36 mm in diameter and is mounted in a low-profile non-threaded metal cell.
  • With a high transmission of nearly 100% of H-Beta and OIII lines, you will see lots of extra detail in gas and planetary nebulae.
  • The Astronomik UHC 36mm Filter is amazingly scratch-resistant, and has a five year warranty.
  • Parfocal with other Astronomik filters.


Astronomik 36mm UHC Filter
Mounted in a Low Profile Non-Threaded Round Cell

The Astronomik UHC filter is for visual deep-sky observation and some imaging applications.. 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.

Astronomik UHC 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.

Now Mounted in Low Profile Non-Threaded Cell

Sometimes unmounted filters can be hard to handle. The smaller diameters, such as this 36 mm UHC filter, can be especially difficult to pick up and insert or remove from the filter wheel, and that can lead to possible damage as well as unwanted reflections from incorrectly installed filters. Astronomik has solved this problem by mounting their 31 mm and 36 mm filters in a low profile (3 mm) non-threaded cell. O-rings, washers, or spacers are no longer required to hold the filter in place, and because the cell is only 3 mm thick, it works well in all appropriately sized filter wheels. Mounted 31 mm and 36 mm Astronomik filters will also play nice with unmounted versions in the same carousel.

Astronomik 36mm UHC Filter 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
  • Cell thickness: 3 mm
  • 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

Visual, Webcam & Imaging Suitability

  • Visual observation (dark skies): Very good, for telescopes of all apertures and high exit pupil
  • Visual observation (urban skies): Very good, for telescops from 100 mm aperture
  • Film photography: Reasonable, but very long exposure time
  • CCD photography: Good, when used with an additional IR-block-filter
  • DSLR photography (original): Good, colour balance shifted but contrast enhanced
  • DSLR photography (astro modified): Very good, colour balance is near perfect
  • DSLR photography (MC modified): Good, when used with an additional IR-block-filter
  • Webcam / Video (Planets): Unsuitable
  • Webcam / Video (Deep Sky): Good, if light pollution is a big problem
Astronomik Product Number: UHC-36
Additional Information

Additional Information

Manufacturer Astronomik
Type of Filter Contrast Booster
Filter Usage Imaging, Visual
Single or Set? Single Filter
Filter Size 36mm
Filter Shape Round
Filter Mounted? Unmounted
Warranty 10 Year Warranty
Peak Transmission 96% of H-Alpha; nearly 100% of O-III and H-Beta
Included Items

Included Items

  • Astronomik UHC Filter - 36mm Round Mounted
  • Protective Plastic Case
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