Astronomik CLS CCD DeepSky & LightPollution Clip-Filter for SONY Alpha 7 & 9 Cameras

Astronomik CLS-CCD DeepSky & LightPollution Clip-Filter for AstroPhotography
Mounted filter in SONY a7 Cell

If you have an unmodified SONY ALPHA 7 series dslr camera, the slightly cheaper Astronomik CLS filter would be just as useful for you as this item.

We are proud to unveil the new Clip-Filter for the amazing Sony Alpha 7 series!

After a long period of prototyping and developmentwe 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 glas and only minimal obstruction in the corners.

These Clip-Filters are designes and optimized to be used with normal lenses and with telescopes as well.

Watch on YouTube!

Instructional Video on YouTube: How to Install and Remove Clip-Filters for Sony Alpha 7 Cameras

COMPATIBLE SONY ALPHA 7 CAMERAS:

• 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

NOT COMPATIBLE:

• Sony Alpha 7R IV: Not compatible
• Alpha 58, 68, 77, 99, 6500: Not compatible
• All Sony DSLR Bodies with the A-Bajonett: Not compatible

For full compatibility list please visit the manufacturer's website. Click here!

NOTE: The filters are not suitable for Sony alpha 3000 to 6500 or Sony alpha NEX cameras.

WORKS WITH USUAL SONY LENSES, BUT PLEASE USE COMMON SENSE WHEN INSTALLING A LENS (i.e. if the lens will protrude into the direction of the filter, don't install it... you will break the filter...)

Use Astronomik filters for your Sony Alpha 7 and enjoy marvelous images with an ultra light equipment!

The Astronomik CLS CCD is suitable under light-polluted skies for DSLR Cameras, which have been remodeled for astronomical use. The filter enhances the contrast between all deep-sky objects and the background.

The CLS-CCD Filter enhances the contrast between astronomical objects and the background. Due to the wider transmission curve compared to UHC filters, a greater amount of light will pass the filter. Stars will be less dimmed. This filter has been optimized to block as much spurious light as possible and simultaneously provide the best performance for 'useful' light. A good filter for DSLR-, CCD- and film b/w-photography as well as observation of deep-sky-objects with telescopes or photo lenses of all aperture f/3 and above.

Main use

The filter blocks completely emission lines of artificial light sources like streetlights (e.g. sodium- and mercury-vapor) as well as the airglow. All 'important' emission lines as well as the spectral range of the night-adapted eye are beeing passed. The supplementary IR-blocking layer allows the use for DSLR- and Webcams without an integrated IR-block filter.

Other uses

• Easier resolution of Double Stars.
• With the EOS-Clip model, photography with DSLR cameras is feasible even unter extreme light-polluting conditions without shifting the white balance.
• The 1,25" and 2" socket models can be used for observations from light-polluted areas.
• If you plan to create color images from emission line data, our CLS-CCD filter is a great choice for the Luminance channel

Alternatives

CLS: For cameras with an integrated IR-filter or for visual observation.

Suitability

• Visual observation (dark skies): Good, to reduce light pollution by mercury-vapour lamps (streetlight)
• Visual observation (urban skies): Reasonable, an UHC-E or UHC filter is more suitable
• Film photography: Very good, colour balance is near perfect
• CCD photography: Very good, optimized rejection of light pollution
• DSLR photography (astro modified): Very good, colour balance is near perfect
• DSLR photography (MC modified): Very good, colour balance is near perfect
• DSLR photography (original): Very good, colour balance shifted but contrast enhanced
• Webcam / Video (Planets): Unsuitable
• Webcam / Video (Deep Sky): Very good, if light pollution is a big problem

Technical Data

• 97% transmission at 656nm (H-alpha)
• 95% transmission at 486nm (H-beta)
• 95% transmission at 496nm (OIII)
• 95% transmission at 501nm (OIII)
• pass from 450 to 520nm and from 640 to 690nm
• Parfocal with other Astronomik filters
• Glass thickness: 1mm
• Diffraction limited, the filter will not reduce the optical performance of your telescope!
• Completely resistant against high humidity, scratches and aging effects
• Astronomik filters are delivered in a high-quality, long lasting, filter box

How to read the above chart?

    * The horizontal axis is the Wavelength in Nanometers (nm). 400nm is deep blue, at 520nm the human eye senses green and at 600nm red. At 656nm 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 filled with grey  in the background shows the relative sensitivity of the human eye at night. The maximum is at ~510nm 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 of the eye at 656nm is 0% at night!
    * Photographic filters: The grey line in the background shows the sensitivity of a typical CCD sensor.
    * The most important emission lines from nebulas are shown in green. The most important lines are from ionized Hydrogen (H-alpha and H-beta) and double ionized oyxgen (OIII) .
    * The most important artifical emission lines are shown in orange. The artifical light pollution is dominated by mercury (Hg) and sodium (Na), which are used in nearly all streetlights.
   

The major emission lines of artifical light pollution: | Hg 435,8nm | Hg 546,1nm | Hg 577,0nm | | Hg 578,1nm | Na 589,0nm | Na 589,6nm | | Na 615,4nm | Na 616,1nm |

The major emission lines of nebulas: | H-β 486,1nm | OIII 495,9nm | OIII 500,7nm | | H-α 656,3nm |