K&F CONCEPT 77MM Polarising Filter Circular Polarizing CPL, Ultra Slim, Japan Optics, Multi Coated, with Cleaning Cloth (Nano-K Series)

I bought a set of these in different sizes to suit three lenses. Fair value for simple lens protection and image adjustment. Easy to fit and adjust.

Very good quality filter. Rotates very smoothly. I have several filters from K&F and all are excellent quality and very good value for money. I definitely recommend.

Does what it says really, much improves photos especially with car photography to stop reflections. Nice and thin too, definitely worth the price though higher end lenses might notice a little drop in quality, haven’t noticed anything on my kit lens. Only “issue” is I don’t like the blue tint on the filter itself, doesn’t affect photos but I think it looks a bit cheapy on the camera, a bit toy like. But doesn’t matter, doesn’t affect anything

Quality item as expected A++++

Edit: I have upgraded from 1 star to 5 stars to reflect on the outstanding customer service I received. I had a problem with the filter I received but the company got in touch with me and offered me a refund, replacement, or an alternative filter (which they despatched almost immediately). The filter they sent me works beautifully. Things go wrong sometimes and I was very impressed with how well and how quickly they responded to this. I would have no hesitation in purchasing from the again Fits easily and turns easily, Works ok for wider shots, but on full zoom the image is unusable. I took two shots with a Nikon Z6 and the 28-400mm lens, shot on manual at 400m, F/8, 1/320s, ISO 100 The first one is with no filter and the second with the K&F filter. It's cheap so not worth returning but I will need to buy something that works at 400mm

Ordered a cheapish filter to begin with to see if suited me. At first fit it appeared not to vary polarising effect as I rotated it on the camera. But upon further trials on the reflections off my car bonnet, it does vary with rotation as described. Just got to get the angle right. Quality is very good for a budget filter, but one thing I don't like is how hard it can be to remove from lens. Iy takes a few rotations on sliding ring before it seems to pick up on the threads and starts to unscrew. Not a massive issue, but would be a right pain if needing to remove in a hurry.

I both two of these and have mixed results: - A 40.5mm filter for a 28-60mm zoom lens and it was good. Perfectly sharp, good filtering. It has quite a warm colour cast, but for the price, this was acceptible. - A 67mm filter for a 70-180mm zoom lens, which was unfortunately terrible. Even at 70mm, the image quality had this directional blur to it which only got worse as the focal length increased. I don't know if this was a fauly item, or just some combination of the long-ish focal length and larger diameter.

Update: K&F have been in touch and sent me the X Series filter that does work fine at all focal lengths. Much better customer service than I originally received. I’ve changed the rating to 4 stars, as this filter did work really well while not at full zoom, and may not cause any issues at all to smaller lenses. It’s well priced and fits and works well. I just wish there was an acknowledgment of the known issue at higher focal lengths in the description to better inform customers. Original review: Very disappointed. The filter does work well, as long as you don’t use your lens at full zoom. Obviously while you’re out you definitely want the ability to shoot at full zoom, 200mm for me, but you can’t as the photos are completely blurry. I did contact K&F for assistance, their reply was that the issue is because I bought the K-Series. And if I now spent more money and bought the X-Series it “will likely eliminate the focusing problem you’re encountering.” As a gesture of good will they have offered a 20% discount, but I don’t feel that’s good enough. There was nothing on the product description to say there is a known issue with this filter, and I don’t think I should be out of pocket any more than I already am. Because of this I couldn’t recommend this filter. Two quick, unedited photos attached showing without and then with the filter at full zoom. Photo is unusable!