Manufacturer: Astronomik Filter
Product number: 8h0023

EUR 49,00


incl. 19 % VAT (DE)  
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  • Details..
  • Technical data..
  • In the box..
This Multicoated (MC) glass serves as dust protector or to keep your system parfocal with other Astronomik filters.

This filter should be used if the focal plane of your imaging system should stay in the same place as with other Astronomik filters in place. The multicoating prevents you from unwanted reflections. It blocks neither IR nor UV.

The second main application is dust protection of your system (telescope or camera). As the filter doesn’t modify the spectral transmittance of your system it doesn’t alter the colors. It’s great for keeping all dust away from your optics or sensor.

Lots of Astronomik MC Clear filters in custom diameters are sold to camera manufacturers worlwide. They like the great coating and scratch resistance!

Main use:

The Astronomik MC Clear is made by the same high-end process as all other Astronomik filters. The coating has the same scratch resistance and the substrate has the same high quality. Because of this it is parfocal with all other Astronomik filters and can be used in any optical system for dust protection without modifying the spectral characteristics and without destroying the optical performance of your system.

Alternatives:

You should think about using the IR-blocker or even the UV-IR blocker (L Filter) if you have a system with refracting elements.

Suitability:
Visual observation (dark skies): Reasonable, for dust protection only
Visual observation (urban skies): Reasonable, for dust protection only
Film photography: Reasonable, for dust protection only
CCD and CMOS photography: Good, to compensate the optical thickness (parfocal with other Astronomik filters); dust protection
DSLR photography (original): Reasonable, for dust protection only
DSLR photography (astro modified): Reasonable, for dust protection only
DSLR photography (MC modified): Reasonable, for dust protection only
Webcam / Video (Planets): Reasonable, for dust protection only
Webcam / Video (Deep Sky): Reasonable, for dust protection only


Technical Data:
Transmission even over a wide range, minimum 97%
Fine-optical polished optical glass
Glass thickness: 1 mm
Parfocal with other Astronomik filters
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


Filter transmission curve:



The horizontal axis is the wavelength in nanometers (nm). 400 nm is deep blue, at 520 nm the human eye senses green and at 600 nm red. At 656 nm is the famous "H-Alpha" emission line of hydrogen.
The transmission in % is plotted on the vertical axis.
The red line shows the transmission of the filter.
Visual filters: The grey line in the background shows the relative sensitivity of the human eye at night. The maximum is at ~510 nm and drops to longer and shorter wavelengths. 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 656 nm is 0% at night!
Photographic filters: The grey line in the background shows the sensitivity of a typical astro camera sensor.
The most important artifical emission lines are shown in orange. The artifical light pollution is dominated by see mercury (Hg) and sodium (Na), which are used in nearly all streetlights.
The most important emission lines from nebulas are shown in green. The most important lines are from ionized hydrogen (H-alpha and H-beta), double ionized oyxgen ([O III]) and ionized sulfur ([S II]). The square brackets indicate that these lines are forbidden.

Transmission:Even over a wide range, minimum 97%
Glas thickness:1 mm
Material:Fine-optical polished optical glass
Coating:Hard coated
Cell:aluminium, with 1.25" filter threads
1 filter in a robust filter box



Reviews

Written by Michael Riedel
on 2017-08-25

"Bester Filter für Chipschutz bzw. Staubschutz an der CCD Kamera."