I highly recommend it as it does its job very well. I give it 4 stars because I would like it to come with more adapter rings to be able to adapt it to all diameters

Adapter rings are a useful tool. With lenses of different sizes, I only need one filter that covers the largest diameter. In order to be able to screw the filter onto other lenses, such adapter rings are required. The K&F Concept Step Up Ring for lenses arrived quickly and was packed in a small bag. It is well made and can be easily screwed onto my lens.

In order to be able to use a filter on several lenses, I bought 2 different adapter rings (72-77 mm and 62-77 mm). I'm thrilled that attaching and detaching is unproblematic and fits well on the lenses. The feel is excellent. The grooves make it very easy to feel where the adapter ring ends and where the polarizing filter can be rotated. The material is high quality and well made. thumbs up for that.

I bought this because the kit provides me with the variety of filter mounts I need to cover my lenses. I have not seen any problem with unevenness or color streaks in my images. Focusing is a challenge, of course, due to the filter density. The mounting rings attach securely to my lenses and the connection between the rings and the filter holder is solid. My filter fits firmly in the holder. I suggest inserting the filter into the holder "off camera." Screw the appropriate mounting ring onto your lens, and then "click" the filter/filter holder combination into place. While still holding the camera in one hand and the filter holder in the other, try to wiggle it or pull it off to test that it is firmly attached and that it won't fall off while you are shooting.

K&F Concept Step Up Ring for lenses, 58mm to 62mm, just under 5€ With adapter rings, only the precision of the production counts so that the threads mesh well. The ring from K&F Concept fulfills this very well. Now I can also use the filters from my 55-200mm tele. You should only note that if you leave the adapter on the lens, you may need a larger lens cap, as the smaller one no longer grips. Conclusion: Everything in order, price is right. 5 Stars

So far I have had five different adapter rings for different system cameras from K&F, all of them mainly for taking portraits with Nikon lenses or doing macro photography (especially Tokina 100mm 2.8 with Nikon connection). All specimens have so far been manufactured very precisely and made and make a high-quality impression. Therefore full points, because the price-performance ratio of these items is really outstanding.

I am very satisfied with this filter as it was a one time purchase as I also bought the adapter rings to attach it to the camera and the truth is that it is very good. Today I shot outdoors with the filter on and a pass, it's also appreciated that it's variable.
I'm even looking at a polarizer from the same brand.

Seems well made, especially for the price. Accepts Nikon Ai/D/G lenses At first I couldn't attach the adapter to the Nikon lens. From a web search it seems it takes more force than you might think to put the Nikon lens on and snap it into the adapter. The subsequent assembly of the lenses went more smoothly. I was expecting to be able to use the aperture rings on the D and Ai lenses to control aperture, but that doesn't seem to have any effect. The outer ring used for the G lenses' aperture setting works with them, allowing me to control the aperture (though not as precisely as the D/Ai lenses' own aperture rings). Seems "good enough".