page contents

Astronomik CLS 55-77mm


Astronomik CLS 55-77mm


can be shipped within 5-10 days

£329.00
Price includes VAT, plus delivery


This is a custom version of Astronomiks CLS filter. We have this made in a variety of filter thread sizes from 55-77mm. The purpose of this is to allow fitting to conventional camera lenses for wide field astrophotography. The price is the same for all sizes. If the 77mm is ordered (normally kept in stock) then this can be used with our stepping rings to fit a variety of different lenses. Please specify the size of thread required when ordering.

The Astronomik CLS Filter is a specialist light pollution filter which 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  B&W film 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.

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

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 (original): Very good, colour balance shifted but contrast enhanced
  • DSLR photography (astro modified): Very good, colour balance is near perfect
  • DSLR photography (MC modified): Very good, colour balance is near perfect
  • Webcam / Video (Planets): Unsuitable
  • Webcam / Video (Deep Sky): Very good, if light pollution is a big problem

Technical Data

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

 

 

 

 

 

 

Accessories

Product Note Status Price
Stepping Ring 77mm Filter to 72mm Stepping Ring 77mm Filter to 72mm
£7.50 *
Stepping Ring 77mm Filter to 67mm Stepping Ring 77mm Filter to 67mm
£7.00 *
Stepping Ring 77mm Filter to 62mm Stepping Ring 77mm Filter to 62mm
£7.00 *
Stepping Ring 77mm Filter to 58mm Stepping Ring 77mm Filter to 58mm
£7.00 *
Stepping Ring 77mm Filter to 52mm Stepping Ring 77mm Filter to 52mm
£7.50 *
77mm Rubber Lens Hood 77mm Rubber Lens Hood
£6.00 *
*
Prices includes VAT, plus delivery
Display accessory details

We also recommend

Astronomik 2" CLS
£136.00 *
*
Prices includes VAT, plus delivery

Customers who bought this product also bought

*
Prices includes VAT, plus delivery

Browse this category: Imaging Filters DSLR