Optolong CLS EOS-C Clip on Filter Medium Dovetail Clamp This results in extremely high

This results in extremely high contrast

Parfocal filters: All Astronomik Filters are parfocal

Durable metal construction

Color LCD Display

Optolong CLS EOS-C Clip on Filter Medium Dovetail Clamp This results in extremely highOptolong CLS EOS C Clip on Filter OPTOLONG CLS Filter Clip Built in Filter for EOS C Camera Planetary CCD Cameras & DSLR This filter is made for photography of deep sky targets in urban environments. The filter works by blocking the wavelengths or mercury and sodium vapour used in urban lighting while letting the visible and the critical OIII, H Alpha and H Beta bands through, allowing great versatility in terms of potential objects to image. Use it