Optolong CLS CCD Broadband Filter 2 Inch


  • €149,95
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Optolong CLS CCD Broadband Filter 2 Inch

The CLS-CCD broadband filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for photographic purpose at light pollution area.


Main Use

CLS-CCD is different from CLS with infrared wavelength 700-1100nm cut-off.

Fits with color CCD cameras and modified DSLRs for astrophotography.

Work well on most emission nebulae, planetary nebulae and supernova remnants. 

Noticeable boost in contrast and visibility of the fainter outer detail.

Light pollution filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.


Optolong CLS-CCD Spectrum and Characteristic
Substrate: Optical glass
Thickness: 1.85mm
Tave:  T>90%
Blocking range: 300-1100nm
Blocking depth: light pollution line blocking >99%
Surface quality: 60/40
Transmitted Wavefront RMS: λ/4
Parallelism: 30s


WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.

CLS CCD Broadband is compatible with Crop Sensor camera bodies below:

Canon Digital Rebel XS, Canon Digital Rebel XSi, Canon EOS 1000D, Canon EOS 500D, Canon EOS Kiss F, Canon EOS Kiss X2, Canon EOS Kiss X3, Canon EOS Rebel T1i

Canon EOS 60D + 60Da, Canon EOS 7D, Canon EOS 70D,
Canon EOS 50D, Canon EOS 650D, Canon EOS 600D, Canon EOS 550D

Canon EOS 700D, Canon EOS 1100D, Canon EOS 1200D, Canon EOS 40D, Canon EOS 30D, Canon EOS 20D, Canon EOS 10D, Canon EOS D60, Canon EOS D30

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