Singh Ray Thin LB Warming Circular Polarizer (77mm) brand_Rollei this will not interfere with

this will not interfere with a lens which is not keyed

the BL-3 chamber cover

Don’t buy this if you want edge-to-edge clinical sharpness

This Medalist is in good condition overall

The Canon EF 300mm f4L USM is a high quality telephoto lens with quick USM focusing and Canon's premium L glass and construction

Singh Ray Thin LB Warming Circular Polarizer (77mm) brand_Rollei this will not interfere withThe Singh Ray Thin LB Warming Circular Polarizer is a circular polarizer with a bit of a warming effect which is nice! This is the Thin LB version of this filter, which is thinner to stay out of the way of wide angle lenses, and also lighter and brighter to pass 0. 6 stops more light than other polarizers. In excellent condition, with pouch.