The K&F Concept Nano-A Series 49mm CPL Filter removes the reflections that flat glass cannot: the sheen on water, the glare off shop windows and car paint, and the white haze that sits on leaves and painted walls. Rotating the front ring lets you dial the effect in gradually while you watch the result.
It also deepens blue skies and restores saturation in bright outdoor light, which makes it the one filter most landscape, travel and real-estate shooters keep on the lens. Expect roughly 1 to 2 stops of light loss, so allow for a slower shutter or a little more ISO.
The 24-layer green coating is waterproof and oil-repellent, so fingerprints and spray wipe off instead of smearing, and the ultra-slim frame avoids vignetting on wide lenses. Fits compact primes such as 50mm f/1.8.
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