Good value for money. Would highly recommend

An excellent UV filter that fits perfectly on my Sony 24-105mm camera lens.

I'm old school: I always put a UV filter on my lenses to protect the front element. If you want to know how valuable that is, just look at how far fewer lenses that have "just a little scratch" on the glass are being sold on FB Marketplace or eBay - in fact most people just would don't buy anything. All in all, it's a no brainer for the price. Being primarily a wildlife photographer, dust is more of an issue; I'd much rather dust off a cheap (similar) UV filter than possibly scratch the coatings on my expensive lens. I didn't notice it with this lens, but most UV lenses tend to add the slightest, almost insignificant, blue cast to any image. Since I would process each shot I consider them decent and "worth it" in Lightroom anyway, it's worth it.

Just received today. It feels light, even a bit flimsy when I hold it in my hand. Nevertheless, it feels quite high quality. It seems to have a thinner glass substrate compared to the B+W filters I have. Given the 95mm size, I even have a feeling that the glass might warp under stress, although I know that's unlikely. I'm curious about the optical performance. In terms of price, this is unbeatable, what all other UV filters should cost. There's just no justification for seeing a UV at $200 or even $300. Selling a UV for $200-300 sounds to me like people want the money but don't want to work reasonably hard.

Got some new RF lenses, needed the 43mil and here we go. Great fit, doesn't interfere with retracting the R's Ben when shutting down, nice protection at a good price.

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.