The product reviewed here by K&F CONCEPT is certainly a good product that serves its purpose. I would also have loved to see its properties for myself. But that hasn't been possible so far.

I bought the MRC UV filter in size 77 mm for my Sony SEL 24-105 F4 as part of the last Prime Day. The filter was delivered today. What I noticed right away was that the package had visibly been opened before. It must therefore be a returned item. That alone wouldn't be a problem, because I had previously assumed that these returns were checked before being resold. However, the contents did not contain the high-quality K&F filter with a diameter of 77 mm that I had hoped for, but an inferior UV filter from Praktika with a diameter of 72 mm. The "previous owner" had obviously mixed something up before returning the item. It is far from me to judge whether this was done intentionally or not. But I am of the opinion that Amazon should have checked the item afterwards before reselling it. If this was done at all, it was not done with the necessary precision.

I have now returned the item in the hope that the next Amazon customer will not be happy with it. I have reordered the item, unfortunately now at the normal price. If I have been able to convince myself of its properties, I am happy to adjust the rating accordingly.