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Astronomik SII 12nm CCD Filter MaxFR...

Astronomik SII 12nm CCD Filter MaxFR Clip-Filter Sony alpha 7

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Clip Filter for Sony Alpha 7 and Alpha 9

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Clip Filter for Sony Alpha 7 and Alpha 9

We are proud to unveil the new Clip-Filter for Sony Alpha 7 and Alpha 9 cameras:

After a long period of prototyping and development we are now able to offer you Clip-Filters for the amazing Sony Alpha bodies. The filters are held in place save and secure with no stress to the high quality glass and only minimal obstruction in the corners. The Clip-Filter are designed and optimized to be used with normal lenses and with telescopes as well.


  • The Clip-Filter are sucessfully tested with all Sony Alpha 7 bodies (7, 7r and 7s in Mk I, MkII and Mk III versions) and the Sony Alpha 9 body
  • Sony Alpha 7R IV: Not compatible
  • Alpha 58, 68, 77, 99, 6500: Not compatible
  • All Sony DSLR Bodies with the A-Bajonet: Not compatibel

A short guide selecting the right filter for you:
Lot´s of customers are overwhelmed by the vast number of filters offered by Astronomik. Due to that we give you a short guide how to select the right filter for your application below.

Our normal recommendation for the "First Filter" is the Astronomik CLS filter. The CLS blocks all unwanted artifical light pollution and natural airglow and gives you a dark background in your images. When using this filter you may expose much longer than without, so you will be able to pick much fainter structures and objects. The filter is designed in such a way that all objects are given in their natural colors. -They would look the same if your human eye would be much more sensitive!
Important: The standard CLS has no built-in IR-blocker. In case your camera has been modified for Astrophotography, please take the CLS-CCD which has a built-in IR-blocker!

The CLS is the fist choice for any applications like Night-scape photography and Time Lapse movies!

If you have to work under a heavy light polluted sky, the UHC is a good choice too: It´s transmission curve is very tight. It gives you the light from the Hß, OIII, H-alpha and SII lines in one single exposure. The reduction of light pollution is much stronger than the CLS/CLS-CCD, but the filter will work for gas nebulas only! Any galaxies and open or globular clusters are filtered out! You will get "false colors" with the UHC, no natural colors like the CLS/CLS-CCD.

If you want to die deeper into Astrophotography with your Sony, you should think about a set of emission line filters centered on OIII, H-alpha and SII. All three are available either with 12nm or 6nm bandwidth. With these filters you can do ultra-deep images even under the worst sky you can imagine plus the full moon high up in the sky! Imaging possibilties are nearly unlimited with these filters!
The emission line filters isolate the light from a very tight range of wavelengths. So you don´t get any color information! if you want to create color images (false color like images from the HST), you will need all three filters to mix the three channels into a final color image.
However the H-alpha filter is a great using it alone: Data can be processed to splendid greyscale images!

If you own a modified camera, you should consider the OWB filter: OWB is short for "Original white Balance", and that´s what the filter does: It gives you back the normal color reproduction from a un-modified camera. When using the OWB you may use your modified camera for normal daylight-photography again, without the need for color-correcting each image afterwards!

This SII Filter is suitable for imaging of SII-regions from observation sites with light pollution and from dark sites as well. The contrast between an object glowing at 672nm and the background is increased enormous!

Due to the combination of the narrow bandwidth of 12nm and the high transmission of typically 96% the filter gives you an contrast boost, as all unwanted light from other wavelengths than 672nm is blocked form UV up to the IR. This results in an very dark background compared with any filters with a higher bandwidth
The FWHm of 12nm is optimized for typical DSLR cameras with CMOS sensors and CCD cameras with a normal/high dark current: With these cameras the background signal in images taken from heavily light polluted sites is dominated by the dark current of the sensor, not by fluy coming from light pollution. In this case a further reduction of FWHM does not improve the image, as the background will not get darker. Compared to the 6nm filters you have more stars in the field of view which gives you more guiding stars when working with an integrated/dual guiding chip!

Due to the new MFR coating technique you may use one single filter on all instruments up to f/3 without a significant reduction in performance.

The Astronomik H-alpha filter MUST NOT BE USED for solar observation!

Technical data of the filter:

  • Guaranteed Transmission of more than 90% at both SII lines (671,7nm und 673,0nm)
  • Typical Transmission of 96% at both SII lines (671,7nm und 673,0nm)
  • Full-Width-Half Maximum (FWHM): 12nm
  • perfect blocking of unwanted light from UV up to the IR
  • parfokal with all Astronomik filters
  • MFR Coating technique: Usable with all optics up to f/3
  • Thickness of 1mm
  • Not sensitive to moisture, scratch resistant, not aging
  • opticaly polished substrate, striae-free and free of residual stresses
  • High quality storage box

Imaging with Narrowband-Emissionline Filters
If you have to observe from light polluted sites (like most of us...), imaging with Narrowband-Emissionline filters is the best way to take great images, as all kind of light pollution can be blocked very effective! Normaly an H-alpha filter should be your first step into this amazing field of astrophotography! With an Narrowband H-alpha filter you will be able to take deep and contrasty images even wih very heavy light pollution or with the full moon high up in the sky!
If you look at other astrophotos, an H-alpha is the best choice for all nebulas glowing red! An OIII filters expands your imaging possibilities, as you are able to image all greenish/blueish structures. Planetary nebulas and star forming regions are great targets! The SII filters completes your HSO-set of filters. With these three filters you are able to process your images like the ones from the Hubble space telescope!
The h-beta filter is not available in a 6nm version, as this filter has nearly no meaningfull application. To illustrate this, there are two images shown below: Both were taken with a unmodified Canon 650D. Even as the camera has a sensitivity of less than 10% at H-alpha, there is some signal und structure in the h-alpha image, while you cannot see anything on the image taken with an H-beta filter!

Operation of the filter:
The filter blocks all unwanted light from artifical light-pollution, natural airglow and moonlight. Especially light from High- and Low-Pressure Sodium and mercury lights and all lines of natural airglow are 100% blocked. The filter increases the contrast between the sky-background and objects glowing at the SII line at 672nm.

Tips and Hints for more applications:
Using the SII filter together with OIII-CCD and H-alpha-CCD filters you make produce false-color emission line images (HSO) in the same way as the Hubble-Space telescope. This is possible even from heavyly light polluted sites

If want to image faint objects in starcrowded regions of the milkyway, propably using short focal lengths, the 6nm filter will be the better choice, as the number of stars is reduced by a factor of ~2. You should even take the 6n mversion if you have a camera with a low thermal current or if you have to observe from a really heavily light polluted site.

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Astronomik SII 12nm CCD Filter MaxFR Clip-Filter Sony alpha 7

Astronomik SII 12nm CCD Filter MaxFR Clip-Filter Sony alpha 7

Clip Filter for Sony Alpha 7 and Alpha 9

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