Optolong CLS Filter - Clip filter for Canon EOS APS-C Cameras [OPTO-APS-EOS-C-CLS]

Optolong: The Optolong CLS filter will improve contrast and increase the visibility of weak outer regions on most emitted, planetary and supernova residual nebulae from polluted locations in a color imaging camera.
The Optolong CLS-CCD filter works by specifically reducing the transmission of wavelengths of light pollution, in particular the artificial type caused by vapors of sodium vapor and mercury vapor at high and low pressure. The use of a CLS filter will also increase the contrast by reducing the light radiation caused by the neutral oxygen emissions normally observed in the atmosphere.
The CLS EOS APS-C Clip Filter consists of multi-layered Schott glass with ion deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. The filter cell is made of light and solid metal, CNC machined, sandblasted, black anodized and then laser engraved.