UV Protection Filter for Pentax smc FA 645 400mm f/5.6 ED IF Lens — Blocks UV & Blue Cast, Protects Against Dust and Scratches

Made specifically for the Pentax smc FA 645 400mm f/5.6 ED IF Lens, this UV filter absorbs ultraviolet radiation that can produce hazy, low-contrast images and a bluish tint—conditions most noticeable at high altitudes, by the sea, or on snowy terrain. By reducing that blue daylight cast, it helps render more natural tones and clearer results in a variety of outdoor lighting situations. Optically neutral with a 1x filter factor (+0 stop), the filter does not alter exposure, contrast, or color balance. Your photos retain their original sharpness, fine detail, and accurate colors while gaining the benefits of UV reduction. Engineered for everyday use, the filter serves as a protective layer that can remain on the lens continuously. It defends the front element from scratches, dust, dirt, water spots, fingerprints, and accidental contact, and provides added protection against bumps, drops, and abrasions—helping to prolong the life of your lens investment.