The offered filter has an excellent coating and good light transmission. It's well packed, dust free and the cleaning microfiber cloth is a nice touch. However, it's not for every lens out there. While I like the knurled ring for better tactile feel, it makes it impossible to fit the lens hood on certain lenses like my Sigma 45mm 2.8 lens. The knurling protrudes beyond the diameter of the filter and interferes with the hood. I hope that K&F will offer options when it comes to the design of their filter rings to circumvent this problem.

I now have this amazing filter attached to my Olympus 60mm macro lens. The lens has no lens hood, a bad front cap and obviously no filter. This is now on board, along with a tidy front cap and third-party lens hood. 46mm is a little small and fiddly, but this one has a really good knurled ring that feels good in the hand. The thread is also very smooth and positive. The color balance is imperceptibly different, so it doesn't bother when shooting in well-lit close-ups. I love the improvement on this brilliant lens. ricky

Easy to use, easy to install, compatible with lens cap and lens hood. Fog filters are used to add cinematic flair to your photos or videos. Diffusion filters around your lights or objects like a misty "dreamy" halo. I definitely recommend adding this filter to your collection!

There is only the latest K&F Concept C-PL filter, tested worldwide, and the picture is very bright and beautiful, and there are no problems at all. However, the silver frame has major irregularities and is slightly thicker. Ease of putting on and taking off has been improved, but as this part gets thicker, it will get in the way at the last minute when trying to put on the lens hood later. If you press it hard it will fit, but it will also catch when you remove it. So it's a good idea to attach it in the order hood → filter and when removing filter → exhaust hood.

I've been using this CPL/density filter for about a month and it's amazing. I take stock photos for some dealers and it works great in harsh light and balancing/removing reflections.
As far as it's used for landscapes and portraits, it really helps to tone down highlights for better control when editing, and deepens some other color areas that you often lose.
The only downside is that I can't use my lens hood as a "shock shield" as you can't use the CPL with a lens hood. Currently using this filter on a Tamron 24-70 G2

I'm really happy that this filter can be screwed onto my Nikkor Z 24-70 f/4 S with the lens hood in place. Obviously I need to reach into the lens hood to adjust the filter, but that's ok. No vignetting that I can see.
The filter works great, nice smooth action and a great range of density.

Granted you have to put the magnetic ring in the hood first, then the filter, but it connects to the magnet and since this lens has a handy little sliding door, I can adjust the variable ND filter... lol..

I'm really happy that this filter can be screwed onto my Nikkor Z 24-70 f/4 S with the lens hood in place. Obviously I need to reach into the lens hood to adjust the filter, but that's ok. No vignetting that I can see.The filter works great, nice smooth action and a great range of density.