I have worked with K&F Concept filters and camera accessories for a few years and the large majority of my experiences with their products has been positive. I needed a CPL filter for a relatively new-to-me lens, so I had good expectations of this one. I have not worked with it long but so far I have had good results with it.

This is more than just a CPL filter but also a black diffuser and softener. I was primarily interested in the circular polarizer, though having other features is not unwelcome. My lens has a 67mm thread size, so I selected that size filter and it fits perfectly as expected. As a bonus to me, my lens cap fits snugly on the filter too so I can leave my filter and lens cap on the lens together.

In testing I pointed my camera at a 45-degree angle to a window in bright sunshine, and I was picking up all kinds of reflections. I turned the filter ring and the reflections faded out completely. On another surface at a different angle it softened the reflections but did not completely fade them out, but enough to make a noticeable difference. I have not found a CPL filter that is 100% effective at removing all reflections but this one does just as well as more expensive ones I have used with other lenses.

I have not experimented with the diffuser traits of this filter yet.

The filter comes with three microfiber cleaning cloths which are always useful.

I am pleased with this filter and will be using it more in the coming weeks. It fits my lens perfectly and so far it has worked well.