Canon PL-C 52mm Drop-in Circular Polarising Filter II for 300MM 400MM 500 600MM Lens

Circular polarising filter for Canon super-telephoto lenses. Polarizing filters enhance picture quality by blocking harmful reflected light. Use it to reduce light reflections from glass and water surfaces or to improve colour saturation. Simple to use, these filters polarize light circularly, rather than linearly, so they do not interfere with autofocus or TTL light metering.