They do work, the sizes are accurate, and they are made out of metal. That is the upside. The downside is that they are thin. That makes them light but it also makes them easy to bend. The threads are very delicate and it will be very easy to cross thread and strip them so be CAREFUL when screwing them on your lens. The good news is that is more likely that the adapter ring thread would get messed up than the lens thread. Either way I say be careful. Adapter rings are, at times, a necessary thing but avoid when you can. If you are using an adapter for a filter you might be better off by buying an inexpensive filter for that size of lens instead. Just saying.
20/02/2019
These things are awesome. They’re super lightweight and easy to take apart/ put together
26/01/2019
Covers a large variety of lens sizes. Although a few more would are needed for my complete setup it got me nearly there. As with any filters or rings do not over tighten.
25/12/2018
These are a MUST-HAVE for your camera and lens kit. No fitting issues, no slipping, and they hold your varying sizes of variable ND, circular polarizers, and much more in place without any fear of them falling off like some other brands do. When you're done using these, they easily unscrew from their secure attachment. I'm very happy with this set added to my filmmaking arsenal.
04/08/2018
I haven't had a chance to properly use then yet. But they look like they'll do the job and are well made.
18/02/2018
Ordered Thursday, delivered Friday, used Saturday on my new Fuji lens for use with close up filters. Well made, fitted perfectly, great purchase. This was my 2nd purchase from K & F. I was just as satisfied with my first.
10/02/2018
Does what they say they do. My only question is why don't they include a 49-52?? They completely skip that set. I mainly purchased so I could use my 52mm Variable Nd filter on my 49mm lens and with this it goes from 43-52? Skipped a lens set completely so for that I give them 3stars, besides that it's great. Just look out of you need a 49mm step up as the 43-52 will not work for you.**Edit** Very Fast response from the company and there intentions were very positive to fix the issue. They get 5 stars.
19/12/2017
Perfect quality and fit. I did proactively use a very light application of Vaseline to be sure they don't seize up but that's on me.None were out of round or otherwise incorrect. All pieces were received in separate plastic slip covers which was appreciated.So no chance of them showing up already seized up. Packaging was correct for the product. I would buy from this merchant again.Job well done!
25/11/2017