• Product information:

Astronomik CLS-CCD

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 backround.

The CLS CCD Filter enhances the conrast between astronomical objects and the backraound. Due to the wider transmission curve than that of UHC-E 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. Low-priced filter for DSLR-, CCD- and chemical b/w-photography as well as observation of deep-sky opjects with telescopes or photo lenses of all aperture f/3 and higher.

Effectiveness
The filter blocked emission lines of artificial light sources like streetlights (e.g. sodium- and mercury-vapor) as well as the airglow completely. 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 inbuilt IR-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.

Alternatives:

• CLS: For cameras with an inbuilt IR-filter or for pure observation.
• UHC CCD: For telescopes with apertures of 5" / 125 mm and higher we suggest the UHC CCD-filter with an anhanced contrast value.

Suitability:

• visual observation: good with telescopes of all aperture
• Film photography: very good
• CCD photography: very good
• DSLR astro-photography: very good, no shifting of white balance
• Webcam: inproper
• Video: not tested

Technical Data

• 95% transmission at 501 nm (OIII-Linie) 
  
• 95% transmission at 486 nm (H beta-Linie)
  
• 95% transmission at 656 nm (H alpha-Linie)
  
• by-pass from 465 to 530 nm and from 650+
  
• FWHM 100 nm
  
• Parfocal with all other Astronomik filters
  
• inured to humidity, ageless, scratch-resistent
  
• Diffraction limited, the filter will not reduce the optical performance of your telescope!

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