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Astronomik CLS CCD DeepSky & LightPollution XT WIDE FIELD Clip-Filter for Canon EOS APS-C Cameras

Astronomik CLS CCD DeepSky & LightPollution XT WIDE FIELD Clip-Filter for Canon EOS APS-C Cameras

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in In stock (2)
Model
10203083
Weight
0.30 kg
Our price:
$158.30
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Astronomik CLS-CCD DeepSky & LightPollution XT Clip-Filter for WIDE FIELD AstroPhotography
Mounted filter in EOS Clip-cell

The new Astronomik XT filters are designed to give you widefield-images with beautifull crisp and sharp stars right to the edge of the field.
Our Astronomik Clip filters are a popular and very well known tool among astrophotographers in the whole world.  Sadly image quality was limited when using them with very short focal lengths to take widefield images: Even if the normal Astronomik filters are made of 1mm thick glas only, some wideangle lenses showed aberations in the edge of the field of view when used with Clip-filters.
The new Astronomik XT filters are coated on an ultra-thin substrate with a thickness of 0.3mm only! Due to that the residual aberations are minimized and stars are crisp and sharp right into the corner of the image.

Comparision image, taken with a Canon 700D and a Sigma 10-20 mm F4,0-5,6 EX DC Wideangle lens at 10mm. Compare star sizes/figures with a conventional 1mm Astronomik filter and the 0.3mm Astronomik XT filter!

1mm Clip-Filter

Image 1: Taken with an Astronomik CLS Filter with the normal thickness of 1mm

 XT Clip Filter

Image 2: Taken with an Astronomik CLS Filter XT Filter with a thickness of only 0.33mm

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

Astronomik have re-designed all of their photographic filters. Since the end of 2008 they are shipping their new "Halo-Free" filters.

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

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 |

 

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