POSITIVE The K&F Concept K-Series 55MM MCUV Pro UV Filter offers excellent lens protection. It is made from high quality optical glass and features a multi-layer coating to reduce reflections and maximize light transmission. The processing of the filter is solid and of high quality. The filter is very compact and lightweight and easily threads onto my lens without adding weight or causing vignetting. It was also easy to unscrew. One advantage of the UV filter is its effect in minimizing UV rays. The filter absorbs ultraviolet rays, reducing the bluish cast that can often occur when shooting outdoors. This greatly improves the clarity and color reproduction of the photos. In addition, the filter also serves as a protective layer for the lens. It helps keep away dust, scratches and fingerprints, thereby maintaining the longevity and performance of the lens. The image quality with the K&F Concept UV filter is excellent. The filter does not affect the sharpness or contrast of the recordings and delivers clear and sharp images. At least I couldn't notice any negative difference in the test photos. NEGATIVE Nothing. ⭐️ Conclusion: I am satisfied with the UV filter from K&F Concept. It offers excellent protection for my lens and does not negatively affect the image quality, but reduces unwanted reflections and blue cast. I can recommend it and get full marks from me.