UV Protection Filter for Pentax HD Pentax DA 21mm f/3.2 AL Limited Lens — Blocks UV, Reduces Blue Cast, Guards Against Dust & Scratches

Made specifically for the Pentax HD Pentax DA 21mm f/3.2 AL Limited Lens, this UV protection filter absorbs harmful ultraviolet rays that can introduce haze and low contrast—especially at high altitudes, near the ocean, or in snowy environments. By cutting the bluish cast of daylight, it helps render more natural tones and clearer images across a variety of outdoor lighting situations. Optically neutral and clear, the filter has a 1x filter factor (+0 stop), so it does not alter exposure, contrast, or color balance. Your photos maintain full sharpness, fine detail, and accurate colors while benefiting from UV reduction. Built for everyday use, the filter can remain mounted on the lens to shield the front element from scratches, dust, dirt, water spots, and fingerprints. It also adds a layer of defense against accidental bumps, drops, and abrasions, helping extend the usable life of your lens.