Manufacturer: Optolong
Product number: OPL-CLSCCD-2

EUR 169,00


incl. 19 % VAT (DE)  
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Optolong CLS-CCD Light Pollution Filter 1.25"
The CLS-CCD broadband filter is designed to improve the visibility of various deep-sky 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 (skyglow). Together with the highly transparency in main nebula emission lines at OIII (496 nm and 500 nm), H-beta (486 nm), NII (654 nm and 658 nm), H-alpha (656 nm) as well as SII (672 nm), the filter is suitable for enhancing the contrast and details for photograghic purpose at light pollution area.

Main Use and Performance
CLS-CCD is different from CLS due to cut-off of infrared wavelength from 700-1100 nm
Fit with color astro 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 filters do not completely 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.
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.

Substrate:High-quality optical glass from Schott
Thickness:2.0 mm
Surface Treatment:Fine-optically polished
Surface Polish Quality:60/40 (Refer to MIL-O-13830)
Surface Quality:1/4 wavefront
Transmission nebula lines:approx. 95% at main nebula emission lines (H-alpha 656 nm, OIII 496 nm and 500 nm, SII 672 nm and H-beta 486 nm)
Transmission off-band:approx. 0.1% transmission of off-band, specifically the major emission lines of artificial light pollution
Coating:Muti-coated
Cell:Filter cell 2", black anodized, laser engraved
Clear Aperture:45 mm
Cell height:5 mm without external thread, 7 mm with M48 external thread
Filter
Protective Box

Which side of the filter needs to face towards the telescope?
Optolong has a good explanation on their page with a check on unmounted filters. With mounted filters, it´s easy. The side with the external thread must face the camera.

Link to iOptron page: Should Optolong filters be installed in a certain orientation? (external link)
You can download the generated PDF from our own server.


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