POSITIVE The K&F Concept K-Series 55MM MCUV Pro UV filter offers excellent protection for the lens. It is made of high quality optical glass and has a multi-layer coating to reduce reflections and maximize light transmission. The workmanship of the filter is solid and high quality. The filter is very compact and lightweight and easily screws onto my lens without adding any extra weight or vignetting. It was also easy to unscrew again. One advantage of the UV filter is its effect in minimizing UV rays. The filter absorbs ultraviolet rays, reducing the blue cast that can often occur when shooting outdoors. This significantly 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 tint. I can recommend it and get full marks from me.