Use it as a protective filter, no noticeable degradation on the Sigma 150-600 FE.

I mainly use it to protect my lens from scratches and dirt. It reduces the amount of ultraviolet light entering a camera. Without this filter you will notice discolouration. It effectively removes the appearance of blue tones bleeding in your photos.

first bought the K&F Nano series filter for one of my lenses. I believe it was for my Nikon 80-200mm F2.8 D ED lens. This lens produces really sharp images at a distance and is not a close focus lens, even noted by Nikon. I bought the lens used and it came with a dented UV filter. I got ghosting and when I removed the filter the ghosting was significantly reduced. I ended up buying several more for my other lenses. I also use B+W filters. Well-made filters too, but a little more expensive. The K&F is by no means a $100 filter, but for the price it does what I need it to do. I particularly like the grease and water-repellent nano-coating. Worked well when I was shooting at the beach. The sea fog is easy to remove without smudging. We really don't need UV filters anymore with digital because UV doesn't interfere with the sensor like it did with film. I just use them to avoid having to constantly clean the front elements of my lenses. I think keeping this to a minimum will prevent potentially scratching the element. I know there are a few schools of thought on this subject, but I just do what I'm comfortable with. From what I've read and can tell, the filter is glass and not plastic, which is nice these days. I have them on all my lenses now and am happy with them.

Nevertheless, it is well made and even comes with a cool case. But come on. Your manufacturing costs compared to your selling price?

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

Bought a Tamron 150-600mm G2 EF to photograph cars on the track. It uses a 95mm threaded mount. Required a quality UV filter to protect the huge front element from tire and road debris from passing cars. Works perfect! I always have the lens hood on, so I can't speak for flare or ghosting.

Perfect companion to my Fujifilm X100V and Hogue Lens Cover. The fact that it's waterproof is a plus; This filter is an excellent addition due to its WATERPROOF HIGH QUALITY UV FILTER. Happy to find it at Amazon.com Arnold

This is a very nice, high quality filter that fits my Lumix FZ80 lens perfectly.

Very good quality with perfect protection for lenses

This filter only helps keep the dirt out of the front element. This protection prevents the lens from slowly getting micro-scratches and ruining the entire lens. It's easier to replace a filter than a lens. Use K&F filters on all my lenses and not just on UV.