I'm guessing by the 5 star rating, you can tell where the Headline is going to end up... so I'll keep it short.

I have been very happy with ALL my K&F Concept products so far, and this filter is NO EXCEPTION!

The build quality is on par with the best I've ever paid (too much) for... no names mentioned, and it functions exactly like you would expect a piece of Japanese Glass would work... that being said... this is their entry level offering, and they do offer a PRO version (amongst others) that when 'pixel peeping' you MAY notice a difference between... however I have found the most times it's user error or hardware malfunction where most filters fail their photographers. If the environment is conducive to the lens without a filter... I will Always shoot that way, however WHEN a filter is recommended/required ... for my usage K&F Concepts beats many many others Hands Down No Questions FULL STOP.

I find the operation to be extremely easy and the ND End Stops make it Impossible (in my usage) to manifest the dreaded "X" . I have yet to find a reason to buy another brand of filter since finding K&F years ago, their quality, along with 'reasonable' price points, make them (for the foreseeable future) my Go To solution.

There is 1 thing I'm a bit perplexed about with this specific filter... it DOES in deed fit an 82mm lens mount... HOWEVER once installed, you are unable to use the 82mm lens cap you had on your lens, as the filter goes up in size from the mount to the front of the filter... and the cap is now too small. So you'll either 1) have to buy an additional cap if you intend to leave this on camera, or 2) Remove/Install it every time you reach for that 24-70mm (for example).

If My Humble Opinion matters... K&F Concepts has my full support!!

I hope this helps.