K&F concepts. They’ve been around for awhile now, so I trust them and their camera gear.As far as their UV filter, it’s awesome.The packaging itself is beautiful. The box it comes with actually turns into a frame for a photo that you can place into the center of it.The filter case is also beautifully made. Really premium feel. The package also includes a cleaning cloth.But the filter. First off, putting it onto my lens was pleasant. The partially texture/knurled surface of the ring makes it putting it on and off easy. You can really get a grip onto the filter.The clarity is way better than my previous cheap Hoya. This might be due to the different coatings this filter has but it’s been noticeable.I mainly use UV filters for protecting my lenses. I’ve had a few drops and I’m always happy that I’ve had a UV filter on.You don’t want to cheap out on a UV filter because it may affect image quality and I’m glad I’ve got this one from K&F. I’ll be leaving this on this lens forever!

I got this UV protection filter for my dslr lens after scratching another one. This lens is slim and fits well. It is great for adding a layer of protection to your lens. This filter comes in a very nice case for storage. I don’t notice a huge difference in my photos with and without, but the added protection for my lens is worth it.

This is a great filter and fits my sigma e-mount lens perfectly! The packing is fantastic and the case to carry the filter is designed so nicely! Love everything about it!

its hard to believe, but this is the first UV filter that I have had that actually makes my images BETTER! Most UV filters I have used over the years have had no real real visible effect on my images, and some have actually had negative effects because of poor quality. This filter is seriously amazing to me. It better be for the price, right?! Lol. its pretty expensive, but my images are actually coming out better with it, so I guess its worth it. Loving everything that is coming out of K&F Concepts lately. they have really stepped up their game.

This filter came elaborately packaged suitable for gift giving. It also looks great with a gold colored inlay showing its pedigree. Please see the image that’s part of this review for a look at part of the gold colored lettering.It sure does look the part. I tried some test shots with the filter on and off the lens and then did the best pixel peeking I could noting no difference in exposure or color cast. To be fair, I’ve never noticed this with any high quality filter. I’ve never bothered with bargain basement filters because I have no interest in Lomography or its related ilk.The manufacturer says this is thin and it is. Please see the image where I compare this filter with another UV that costs less than half as much. Both seem thin to me. I don’t see how thickness makes that much of a difference because adding any filter will require the removal of this one or you’ll get image quality robbing refractions from between the two filters.I considered using a micrometer to measure the thickness of the lens itself but gave up the idea because I had no way to assure that I’d not scratch either this or another filter I’d use for comparison.In sum, this does work well as a UV filter and it does not in any way alter the images when compared to the same lens without this filter attached.

This is a very nice filter but is a bit pricey compared to others from K&F. This is very thin and well made but doesnt offer as much as say their CPL filter does. This doesnt have the same grip and texture though thats probably due to the slimness. Of the higher end filters K&F makes I dont see the same aesthetics with this one. Optically this still performs well.

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 The lens looks and feels nice. It seems to be of good quality and would last longer. The storage case looks elegant and comes with a wipe to clean the lens. The few pictures I have taken seem reasonable, and the lens doesn't cause any issues with the quality.

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Got this to combo with my Canon R5 and the nice all-around RF 24-105 4 L lens. Fits nicely, and the lens cap is secured. Its UV protection is a nice feature to have. It keeps my pictures free and clear from those pesky UV rays when taking pictures outdoors, especially at the beach. My kitty ended up being the celebrity for the day while we were getting some sunshine hehe. Definitely worth getting, especially for anyone doing outdoor photography with the 70-200 2.8 L lens or 24-105 4 L lens (77 mm diameter).

K&F’s build quality has been second to none in the last several years. They’ve created a series of extremely high-quality filters using very slim precision machined brass rings ( brass is a much better material to use for this purpose than aluminum. It’s much less likely to strip threads or to cross thread) and excellent optical glass.This filter is no exception. It has absolutely no optical distortion whatsoever. It filters UV and pretty much nothing else I think it has about a 99.9% visible light transmission.Most people use UV filters to protect their lenses but it’s also helpful to filter out UV light for photographic reasons. It can help to increase the life of your camera sensor and prevent distortion in the images.The anti-reflection coding on this is extraordinary. This competes well with my expensive high end German filters that cost up to four times as much money.This filter is slim enough that it should not interfere with the image or create any vignetting even with wide-angle lenses.This is my review for the UV filter but honestly every K&F filter I have purchased has been extraordinary.Look at the photo and see if you can tell any difference.

This new line of pro grade filters from K&F Concept is truly fantastic.These filters are super slim, with smooth threads that attach easily to my lens.The UV filter doesn't have any color cast or produce any optical aberrations in general.Just a crystal clear filter to keep your lens safe.Comes with a padded case for safe storage.