K&F CONCEPT 39mm Polarising Filter CPL Filter Multi-Coated Japan Optics

I've used quite a few K&F Concept products before, and always found them to be decent quality. The polarisation does a good job of eliminating unwanted reflections and bringing out cloud detail in the sky.

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

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!

Excellent budget polarising filter. Works extremely well at a fraction of retail prices. Highly recommended

Good value for money lens protection. There are more expensive CPL out there but for the price this is ok.

Fits well onto camera lens, feels sturdy and good quality. Good at reducing glare, particularly in bright environments. The camera lens cap still fits securely with it attached, although it does not screw on in its entirety. Additionally it comes with its own casing and cleaning wipe which is a nice touch to keep it protected when not in use. Quick sample photo: with vs without. Detail on cloud is much clearer against the background and less washed out.

Actually it's an OK filter but there are issues, its not the best quality. The polarising effect does not cover the entire semi circle of the filter and is hit an miss even at the best of times, there is significant Vignetting if you happen to be using a 24-105 wide angle zoom and you can clearly see this through the viewfinder of the camera and the edges are out of focus big time. It's easy to use by turning the filter to the desired effect but its only a small are of coverage and colour is of an OK quality but not the best it could be better especially as they are trying to go head to head with the brand leaders out there. Be careful if you adjust the filter by turning the ring as it can come off the lens very easily. I have owned and used much better but as a gap filler it does the job and value for money is a big saving over other makes. Shop around if you wanting top quality like Hoya or Lee Filters.

Nice and cheap cpl filter, didn’t expect such nice quality from such cheap product, metal rim, clean glass

A pretty good CPL filter. I like the quality, but there is one downside - lens cap no longer fits :(

Dobry produkt

Disappointed. Not as described. It just mskes a shade on picture.

Like, the headline says, this IS technically the low-level when it comes to K&F filters... however, it performs wonderfully. For me, I had no issues using it and noticed no lack of detail or focusing ability. If there WAS any detail technically lost, it was more than made up for with the clarity of the image without glares. Obviously, the effect was most noticeable on windows, rivers, etc... but in certain circumstances try using this for portraits and you'll notice some of the specular highlights dissolve to create a more even result! This was something I accidentally discovered, but later found out is a fairly common use. I 100% would recommend having this as a new photographer or even maybe as an older photographer. If you're just a hobbyist photographer, this will help out and it will not break the bank. You won't notice any difference between this and a $400 CPL until you start getting technical with how you want to push your composition. At that point, you can look into higher "quality" glass, but in general, I see no problem with this filter for general use and always carry one in my filter case either as a backup or to use in dusty weather, rain, etc to keep from harming my nicer filters.

Need I say more?