There isnt a lot to test out on these, but what I can say is that it is a very nice piece of glass for the cost. I am of the belief that you should have a uv filter on every lens to help protect it if nothing else. For the money, this is a very nice filter!

Great quality UV filter. I put the 77mm on a Canon lens and it fitted perfectly. Just as importantly it was very easy to remove, which can be tricky with cheaper filters. Picture quality with the filter on was very good and overall very happy with it.

I buy UV filters mainly to protect my lenses. I want something that isn't too expensive and is reasonably neutral. I've bought loads of these filters and, to date, I haven't been disappointed.

I know there is a school of thought that suggests lenses are better without UV filters - but I don't subscribe to that school and I don't see the filters degrading the quality of my lenses or introducing colour casts.

This is a clear protection lens filter. I noticed no intrusion of the lens in any of my photographs. It screwed on easily onto my Tamron 150-600 lens. Clear and well made.

I use this as a lens protector since it basically doesn't seem to add any sort of effect. I think it's just clear, but with some UV protection and whatever other technical stuff it does(I'm not a professional). My lens cap also fits over it, but not perfectly, it still has some gap between the filter and the cap so it's not 100% flush, it could just be my cap though

Exploring new tools to enhance my passion for photography, I came across the K&F Concept Ultra Low Reflex UV filter, and I must say that it has been a real find.

What I liked most about this product is its ability to reduce ultraviolet light and correct the bluish tone that often affects my images. This filter not only eliminates that unwanted effect, but also controls reflectivity exceptionally well, offering 99.8% light transmission and reducing spots and halos in my photographs to a minimum. The quality of the images I have been able to capture with this filter has exceeded my expectations, even in bright sunlight conditions.

Furthermore, its construction with premium optical glass and a 28-layer nano-coating has proven effective not only in protecting my lenses against scratches and dirt, but also in ensuring a neutral color balance and eliminating annoying reflections and ghosting.

As for its use, I have found this filter to be especially useful when photographing bright scenes under bright sunlight, such as at the beach or in the snow. Its ultra-slim aluminum frame design makes it lightweight and easy to handle, making it easy to use in any photographic situation.

However, I must mention that sometimes the filter's effects can be subtle and may vary depending on the lighting situation. Overall, though, I am very satisfied with its performance and quality.

All in all, the K&F Concept Ultra Low Reflex UV Filter has been an invaluable addition to my photography gear. Its ability to improve the quality of my images, coupled with its durability and ease of use, make it a must-have accessory for any photographer looking to take their art to the next level.

This is a nice filter, the anti reflective coating is one of the best I’ve come across and it’s nice and thin so doesn’t vignette on wide angle lenses. Well worth the money.

I recently purchased a Sigma 150-600 DG DN, and needed something to protect the front element from dust and light scratches. It came in a nice hard plastic case, and came with a microfiber cleaning cloth.

It screwed on smoothly, and has large scale "knurls" to help grip the outide of the filter when screwing it on to the lens. I have the Japanese Slim Optics version of a K&F Concepts UV Filter, and this one has noticably better refelction handling, especially with sun glare.

The discussion continues as to the need to keep a clear filter mounted, mostly to protect your lens. But I definitely keep one on each lens.

I'm impressed with this K&F filter. It is very lightweight. The ring holder for the glass filter is metal and well-machined. One of the features I really like is the fact that they have incorporated a couple of reeded sections on the outside of the ring. Sometimes filters can get stuck and be difficult to remove, and those serrations help get a good grip for unscrewing. The ring itself is very thin—I measured it at 6mm, including the threads. The thinner a filter is, the less likely it is to be visible in your shots, especially when using very wide-angle lenses.

I don't know what kind of coatings they have used on the glass—stated as 28 layers in the ad—but the reflection color is a yellowish-green, as opposed to the more bluish-green I've seen on many other filters.

I needed a UV filter for one of my Sony lenses, so decided to order this K&F Concept 67mm UV filter, mainly for protection of my expensive lens. I really like the side grips on this filter as it lets me screw on or take off the filter very easily. I also find the glass to be very clear, and I don't notice any part of my image being degraded at all. The threads are a little rougher than I am used to on this filter as it didn't screw on as smoothly as I am used to, but that also means it won't fall off easily either. Overall, I am quite satisfied with this filter and have no fear it will give me the protection and image quality I am looking for.