For use with lenses using rear-mounted drip-in filters, this polarizing filter can be rotated from the outside without removing the holder from the lens enabling precise control. Polarizing filters enhance picture quality by blocking harmful reflected light. Use it to reduce polarized light reflections from glass and water surfaces or to improve color saturation. Simple to use, these filters polarize light circularly, rather than linearly, so they do not interfere with autofocus or TTL light metering. Compatible with the following Canon lenses: EF 200mm f/1.8L, EF 300mm f/2.8L, EF 400mm f/2.8LII, EF 500mm f/4.5L, and EF 600mm f/4.0L More details about product 48mm Drop-In Circular Polarizer PL-C Filter
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