I have tested this “K&F Concept Nano-X PRO series polarizing filter” extensively with my two 67mm Sony lenses (85mm + 24mm focal length) and would like to share my experiences today: The packaging of the filter is impressive, because “K&F” has this “Pro” Filter very attractive and well packaged.

You will receive a bag with leather parts, which is softly lined on the inside and is used to store the filter. In addition, an extra packed cleaning cloth is included. The bag has a magnetic closure and is very well made all around. The filter itself is also very well made, it has a brass frame and can be easily screwed onto my two lenses. Turning the filter to adjust also works well. Due to its slim design, the filter also does not apply too much to the lens.

The surface of the polarizing filter has been coated on both sides with a 36-fold nano coating, making it waterproof, dirt-proof and scratch-resistant. The coating makes the filter robust and I assume that this makes it durable and allows me to shoot with it for a long time. I am also completely satisfied with the properties of the filter, it reduces reflections (e.g. in water) by eliminating polarization by around 99% and the contrast of the image (easy to see when taking photos of sky/clouds) is also increased.

I've already been shooting in the landscape with the filter, I'm very satisfied with the image quality. I did not notice any visual disturbances caused by the use of the filter. I can recommend the “K&F Concept Nano-X PRO series polarizer”.