High quality CPL filter that I used on my Sigma 70-200mm f2.8 sports lens for motorsport photography. It has the added benefit of being magnetic, which is great if you want to remove it quickly. Even better if you buy the other filters in this range as you can swap them out quickly. The magnet is nice and strong and I didn't feel like it would accidentally fall off. However, I did find that my Sigma lens cap doesn't fit well with the filter or the magnetic ring either. It just clips on but isn't secure and falls off easily. I also found it difficult to remove the CPL filter with the lens hood on as I couldn't get my fingers around the filter. Overall a good filter and very good value for money. I just wish my lens cap at least fit on the magnetic ring as having to unscrew the ring to attach my lens cap kind of defeats the point of the magnetic feature.

Despite the very low price of this filter, I can't tell any difference in image quality at all. I actually took two test photos and now I can't tell them apart. (I'm using a 32.5MP Canon R7 with the Sigma 18-35 f/1.8) This lens filter is very thin and also has filter threads on the front so you can still use the regular lens cap. I believe the filter is multi-coated because if you tilt it towards the light you can see a green or magenta color. Unfortunately I don't have a K&F Concept magnetic filter so I don't know how well this feature works. I only have two complaints: (1) The filter was packaged OK but there was some wiggle room in the plastic case it came in. (2) The Sigma lens cap doesn't fully seat on the filter so the lens cap falls off more easily. Overall, this is a GREAT deal for a filter. Again, I see absolutely no reduction in image quality. It's very likely that I'll get another one of these in the future.

Both lenses are Sigma lenses with 2 different brands of UV filters on them. The lens on the left is my 150-500mm with a different brand filter. On the right is my 150-600mm lens with the K&F filter. The left lens looks a little blurry, but the K&F filter doesn't.

Doesn't reduce the picture quality I can tell. You can feel it's weatherproof, but I'm not testing it to see if it really is.

Comes in a plastic case

No complaints so far.

Although camera technology has advanced in recent years and UV lens filters may not be as important as they once were, they still offer benefits. Although I would sacrifice a filter as just a first line of defence for your precious lens over a lens worth hundreds or even thousands of pounds. This K&F UV filter feels good quality and comes complete with lens cap and wrist strap. I chose the 82mm size for my Sigma 70-200mm f2.8 Sport lens as I do a lot of motorsport photography where it's not uncommon to have rocks and gravel flying at you, especially if you're in the line of fire on a rally stage, so a filter is a great way to ensure your lens is protected. I had no issues screwing it onto my lens and both the supplied lens cap and my original Sigma lens cap fitted the filter perfectly.

Both lenses are Sigma lenses with 2 different brands of UV filters on them. The lens on the left is my 150-500mm with a filter made by another brand. The right is my 150-600mm lens with the K&F filter. The lens on the left looks a little hazy, while the K&F filter does not.

Does not decrease image quality that I can tell. You can feel that it is weather sealed, but I'm not testing it to see if it truly is.

Comes in a plastic case

So far, no complaints.

First impression - fits, well packaged and the lens cap from Sigma also holds on. Would I buy again. Image quality has not yet been tested, if necessary I will write something later.

Both lenses are Sigma lenses with 2 different brands of UV filters on them. The lens on the left is my 150-500mm with a different brand filter. On the right is my 150-600mm lens with the K&F filter. The left lens looks a little blurry, but the K&F filter doesn't. Doesn't reduce the picture quality I can tell. You can feel it's weatherproof, but I'm not testing it to see if it really is. Comes in a plastic case No complaints so far.

I didn't have much time with the filters. I usually shoot several times a month, but this time of year I have limited time. I had planned to use them on a hiking trip that was cancelled at the last minute. I took some test shots and checked the lenses for flaws and found no problems.

Instead of the normal hard shell filters that are included, this comes with a screw cap for each end and a soft carrying case for extra protection. In cases like this, I need more than the pinch lens cap. This screw cap protects the filters. However, removing the cap takes a few seconds longer.

The only problem I've encountered so far is that after tightening the filter to the lens, I've only been able to remove it with a lens filter wrench. The gripping surface on the immovable parts is just not enough to loosen it.

I like the filter set and plan to buy more K&F filters for my other camera lenses, and I recommend their products. I will update this add once I have had a chance to spend a little more time with the lens filter.