needed to protect my FZ300's lens and this filter has some good reviews. The overall quality seems very good and the packaging works well, if larger than needed. The filter threads on nicely without impairing the hood fitment, reverse-stowed, or deployed, and doesn’t show any vignetting at 25mm. There appears to be no noticeable impairment of the photo quality. The glass does seem to attract dust and needed several cleanings before I could mount it on the camera without particles on the inside. The outside needs brushing off frequently. I’ll update if I find any other issues in future, but this filter seems a good buy.

almost returned this when I found out my lens came with a free "$50" Sigma lens uv filter. The optics on it are wonderful, however I'm about to go to Niagara falls and I imagine I won't want to marry my lens cloth. I thought - why not just test them both under the sink before I send it back? So glad I did! Like magic, this K&H filter flows off and all the water dissapears. The free sigma filter? It soaks the water in! And it's hard to get off! If you got a free high quality uv filter and you're dry 24/7 - no need to upgrade. If you value versatility in any weather? Buy this now!

am usually against UV/haze filters as I am concerned about their effect on image quality. However, I plan to use my Sigma 150-600 DG DN Sport (Sony E-Mount) in pretty harsh conditions such as coastal bird photography, surf photography, and sports. So, I caved and purchased this filter to provide protection for the lens front element. However, given that this K&F filter would probably be considered "mid-tier" in terms of price, I wanted to test if it in fact had any effect on image quality. The attached image of a $20 dollar bill was taken under the same exact circumstances - 600mm at ISO 100, tripod with OS off. As you can see from the screenshot taken in the compare view of my photo editing software, the image on the right (with filter) is clearly sharper with better contrast. I'm shocked! I had fully expected to remove the filter when I wanted a better image. Now I can leave it on 100% of the time, and easily wipe off any splashes or dust without worrying about scratching the front element. Strong recommend!

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 So far, no complaints.

nothing fancy about UV filters, you just don't want them to effect your shots, K&F's does a great job with their glass filters. When you invest 100s of dollars for a lens you want something to protect it without distorting and K&F filter do that.

This UV filter is great for the Pentax 17. The lens cap can connect onto the filter.

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.

Great quality and perfect to protect your lens!!

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.