I own quite a few filters (UV, ND & CPL) and other products from K&F. This UV filter came in a square plastic case with a lens cap and lens keeper. The filter was clean out of the box. I got this filter for my Nikon 20mm f2.8D lens. So far, I was using the lens without a filter but got one to protect the lens front element when shooting outdoors. Both the K&F or the OEM lens cap fits well over the filter.

I do not use a filter when shooting indoors. Even outdoors, I tend to use one when shooting in dusty environments and only on lenses that do not have a hood. It is a piece of extra glass that we put over the lens, it will have some minor imperfections which may be visible if one is a pixel peeper.

This filter is good, I did not notice any degradation in image quality on pictures I have shot so far. Even though I do not use it indoors, I took some pictures to test, and did not notice any differences with or without a filter.

The lens cap is ok but not as good as the OEM cap. The pinch is not deep and does not provide a good grip. The lens cap keeper is a waste, I cannot tighten it over the lens barrel and so won’t be using it.

For $10.99, nothing to complain about, this is a good filter with lens cap, helps protect the lens against dust, scratches and fingerprints.