I'm comparing this item KF's regular Nano filter. At the same settings on my Panasonic 85mm f/1.8, I can see more detail coming out of my lens on this Pro filter versus the regular Nano Filter. Since I love the sharpness of the 85mm, I'd much rather use the sharper filter. It's probably not a big deal to those who aren't pixel peeping but I can definitely see a difference in the hairs and I really like this filter.

There are people that claims that when you use an UV filter on your lens, the resulting picture quality is degraded. Maybe my eyes are not that sharp but I cannot tell the difference. This one can be used to protect your lens from dust and the accidental touch with your fingertips. You can clean with included cloth or buy some of these wipes for lenses. Better destroy or damage this one and not your $2,500 lens.

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.

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!

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!

have had many UV filters from multiple brands. This is now one of my favorites. It is exceptionally clear, light weight, and well built. The included storage case is also top notch. I'm going to have the leather flap labeled with a laser. The box converts into a picture frame which is oddly cool.

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 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.

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.

I've heard varying opinions on the benefits of keeping a UV filter on the end of a camera lens. Many people say it's smart because if you drop the camera, replacing a filter is much cheaper than repairing an expensive lens. I've heard others (particularly professionals) say it doesn't make sense to buy an expensive lens and then put a cheap piece of glass in front of it that will just degrade the image. Those folks say keeping the hood on the lens will provide plenty of protection and if you have an expensive lens, it should be insured against damage anyway. I've invested in some good Canon L-series lenses so I'm torn on the best approach. I've been leaning towards going without the UV filter, but I still want one if I'm somewhere like the beach and sand or dirt is blowing. So if I'm going to put another piece of glass on the lens, I want to make sure it's high quality and this filter meets that requirement. You can tell when a vendor has put a lot of thought and care into a product and it shows throughout the process. This filter comes in very nice packaging and they provide a high quality case that has a magnetic latch and a nifty ribbon on the side that you pull to extract the filter from the case. This keeps you from having to reach in and possibly get fingerprints on the filter. Great design! As to the quality of the filter itself, I don't see any aberrations in the image when I use it. This line of filters from K&F aren't cheap so they won't be for everyone, but if you are taking your photography seriously, you should consider this product.