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rating: 5.0 of 5Astronomik 12 nm H-alpha CCD Clip Filter for Sony alpha cameras1
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Astronomik 12 nm H-alpha CCD Clip Filter for Sony alpha cameras
The Astronomik 12 nm H-alpha CCD Clip-Filter is directly inserted into the camera body and works as a narrow band pass filter for hydrogen nebulae.
Transmission of over 97% with the H-alpha line (656 nm) FWHM 12 nm UV and IR blocking clip-mounted for Sony alpha 7, 7r and 7s cameras inserting and removing within seconds all camera and lens functions remain unaffected completely resistant against high humidity, scratches and aging effects 10 years warranty by manufacturer
In the box..
The Astronomik 12 nm H-alpha CCD Clip-Filter for Sony alpha 7 cameras is a narrow band-pass filter for hydrogen nebulae and can be inserted into the camera body within seconds.
Do you own a Sony alpha digital camera for astro-imaging? Then you have surely encountered the following problems: Large filters for large camera lens objectives are very expensive. If you place a filter holder between your camera body and lens, you loose the ability to focus to infinity. For very fast (low f/ number) telescopes like the Vixen R200SS or the Takahashi “Epsilon” astrograph, a filter drawer or a filter wheel cannot be used since the distance to the corrector lenses would be changed. With long exposure times, your camera’s sensor chip is exposed to more dust.
With the Astronomik Clip-Filter System you can take care of all of these problems at once!
The patented Astronomik Clip-Filters are made of black anodized aluminum and laser-cut on state-of-the-art machines. They can be inserted within seconds directly into the camera body. There are no changes necessary and all lens functions (focus, screen, image stabilization) remain operational!
The Clip-Filter System also acts as an outstanding dust shield, which prevents the possibility of dust settling on the sensor during long time exposure (The MC-Clear filter does not have a filter effect and only acts as a dust shield.)
The Clip-Filter are sucessfully tested with the bodies Sony Alpha 7, 7r and 7s. (Astronomik will test other/future models and add them here.)
The manufacturer has made a short video which shows installation and removal of the clip-filter for Sony Alpha:
The filters are not suitable for Sony alpha 3000 to 6500 or Sony alpha NEX cameras.
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 CCD 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 at the H-alpha line (656 nm):
UV and IR Blocking:
Clip-mounted for Sony Alpha cameras
Inserting and removing:
Camera and lens funtions:
Anti reflective coating:
completely resistant against high humidity, scratches and aging effects
"Sehr gut verpackt und sehr gute Qualität. Alles bestens."
Written by Magnar Fjortoft on 2023-10-16
"Ich habe den Filter gekauft, um mehr Ha-Daten zu erhalten und klare Abende zu nutzen, auch wenn der Mond am Himmel steht. Mit einem Clipfilter kann ich sowohl Teleskope als auch Kameraobjektive verwenden, mit sehr guten Ergebnissen. Der Filter ist von hoher Qualität und sehr benutzerfreundlich. Es lässt sich einfach und schnell an der Kamera anbringen und abnehmen. Empfohlen für diejenigen, die Ha Tåker fotografieren möchten, ohne fortgeschrittene Ausrüstung oder Technik."