Optolong CLS Filter - 2-inch

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  • Improves visibility of deep sky objects by reducing transmission from artificial light sources and skyglow
  • Suitable for viewing and astrophotography applications
  • 2mm glass thickness


OUR PRICE $149.00

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    The Optolong CLS Filter is a broadband filter used in visual and astrophotography applications to produce enhanced views of deep sky objects. To do this, the CLS filter blocks artificial light from mercury vapour lamps, both high and low pressure sodium vapour lights and skyglow and accepts transmission of the main nebula emission lines: OIII, H-beta, NII, H-alpha as well as SII. 

    Ideal for areas with moderate light pollution, due to its wider broadband compared to UHC filters, this CLS filter can also double as a general light pollution filter. Its ultra-thin filter cell minimises focusing problems and is compatible with most filter wheels. 

    Suitable for use :

    For astronomy cameras, it needs to be used in combination with an IR/UV cut filter. Alternatively the CLS-CCD filter can be used as it cuts off the infared and ultraviolet wavelengths. In DSLR the IR/UV filter is embedded in the camera so the standard CLS filter is sufficient.

    Light pollution filters do not eliminate the effects of light pollution or increase the object's brightness. It does increase the contrast between nebulae and night sky.

    The Optolong CLS Filters come in 1.25", 2", EOS C and EOS Full Frame sizes. 

    About Optolong

    Optolong Optics is a specialist manufacturer of astronomy and astrophotography filters that are adored by astrophotographers worldwide since it was established in 1999. Particularly famous for their bandpass narrowband filters, “L-Pro” , "L-eXtreme" and "L-eNhance” which enables high quality imaging from simple one shot colour cameras, it’s hard to find a serious astrophotographer that has not longed for an Optolong filter in their tool kit. 

    Product Code: OPT-11802



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