I put the K&F 95mm MC UV Filter on a 180-200 zoom lens to provide some protection for the glass at the front of the lens. I have noticed no odd coloring or decrease in sharpness when using this filter and I was quite happy with it.

I got back from a photo shoot in pouring rain and when hurriedly pulling my camera backpack out of the back of my truck, I accidentally knocked the 180-200 lens (in a dust cover only) out of the backseat of my truck. It fell about 3-1/2 feet to concrete and landed with the lens and filter pointing down. It bent the filter ring in about 1/16 of an inch, knocking the filter lens out of the filter ring but the filter lens was intact. The filter ring was still in place on the lens but the front ring of the lens was also bent, but the lens glass was intact and undamaged. I had to send the lens to the manufacturer to have the filter ring removed and the front lens ring repaired, but the filter really helped to prevent major damage to the lens.

I immediately went and bought a second K&F 95mm MC UV Filter and put it on the lens when I got the lens back from the manufacturer. I also bought a padded case for the lens. The attached photo was taken with the 180-200 lens with the K&F filter on the lens. The photo was compressed down from 50MB to 1MB, so any loss of sharpness is due to compression, not the filter.

Take a look at the zoomed in image for yourself. It's shot on an A7RV at 60MP F8 on a tripod and I can't really tell a difference. Perhaps the image looks a smiiiidge worse with the filter in some areas but even side by side it would be hard to tell.

I'd say great value for the amount of glass protection you're getting. Colors in an indoor environment at least are also identical to my eye, but there is of course a tiny shift in the histogram in Lightroom.

This is thebsole reason for the purchase. I didnt even take lens cap off my new lens until this came in the mail. Does what it needs to do. The 28 layer version feels a bit more fragile and thinner than the 18 layer but maybe its just me.

I always get filters w/ non-slip design when it's available. It makes a huge difference. I compared it w/ Hoya HD2. I shot these w/ Canon M50 w/ Nikon 35-70mm f/2.8 AF ZOOM-NIKKOR.
1) No filter. 2) K&F. 3) Hoya HD2.
Sure, it's not a great test but I can't tell any difference between all 3 of them. The Hoya was optically as good as K&F except it was very staticky that I had to return it. I didn't like it's not non-slip either. The K&F is not staticky at all and very easy to clean. When there's no reflection, it looks like there's no glass inside the ring. Kind of like magic. It's very well made.
I use it on my Zeiss 50mm f/1.5 Sonnar T* ZM. There's no play and it fits perfectly. Very happy about the purchase.

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

I use it mainly to protect my lens against scratches, debris.
It reduces the amount of ultraviolet light that passes into a camera.
Without this filter u will notice discoloration.
It effectively removes The appearance of blue hues bled in their photos.

I originally received just the case that is supposed to hold the lens filter but no filter so I reached out to the company and after providing some information they sent me a replacement which arrived quickly. Great company and good value for what you are getting.

Excellent. I use it on my Sigma 150-600 telephoto lens and it works perfectly. You can't see anything in the image and it feels like excellent quality.

I took a couple of pictures without the UV filter then took a couple of identical pictures with the UV filter on. There was absolutely no distortion or change in quality. None at all. Pretty amazing how I didn't even notice there was anything on. This is a quality product and I am very pleased with this purchase.

I have no complaints about these filters. I run them on all my walkabout lenses that get carried around. Flare resistance is very good thanks to the coatings, and it is rare that I have to make an adjustment to a shot due to flare. The only exception has been when I was taking photos at a museum and pointing upward at items close to bright lights. But other than that, they clean well and let me run without a lens cap for those candid shots.
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