Product details:

The Heliopan 77mm Protection Sh-Pmc Filter is optimally ground from special raw glass and coated with Heliopan's Sh-Pmc 16 layer multi-coating to protect the lens while adding no color whatsoever. For brilliant color reproduction, best contrast and sharpness Heliopan offers the highest quality optical glass from the German Schott Group. Sh-Pmc broadband coatings of 8 layers per side for the highest reflection reduction (below 0.2%). Dust and moisture repellent top coating on each side for easy cleaning and longest life. Slim mount does not vignette with 21mm lenses. Slim mount includes front threads for hoods, caps, even additional filters. Minimal reflections because of matte black anodized brass filter rims which will not bind when threaded in combination with other metals. Color Black.