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2" CLS DeepSky Filter for Telescope 2"
 
Eyepiece - Cuts Light Pollution
 
 
Note:
CLS filter has two kinds of size(1.25" and 2").
This is 2"  CLS filter.
 
Description
CLS filter blocks lights selectively, especially the mercury and sodium light from man-made lamps and the skyglow in nature. CLS filter lets the light from nebula highly transmit, it has a high transmittance at the region of OIII(496nm & 500nm), Hβ(486nm), NII(654nm &658nm), Ha(656nm)and SII(672nm). Our UHC with high-effectively improved the contrast of the nebula ,ensuring wonderful nebula details.
 
Technical Data
--96% transmission at 486nm (H-beta)
--95% transmission at 496nm (OIII)
--92.5% transmission at 501nm (OIII)
--98% transmission at 656nm (H-alpha)
--pass from 450 to 520nm and from 620nm
--Entire Blocking of annoying wavelengths
--Ideal All-round Deep Sky filter even for small telescopes
--Not sensitive to humidity or aging
--Scratch-resistant
--Excellent carrier material. The optical Leitungs of your telescope is not reduced by the filter in any way
--Parfocal with other filters
--Glass thickness: 1.85mm
--Completely resistant against high humidity, scratches and aging effects
  --filters ar

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