I've been using many K&F filters in the past and I have no issue with their filter. This one is also perfect for 49mm lens. UV filter I use is to protect the lens, and this does good job. No image distortion has been noticed. Highly recommend for good lens protection.

No issues with lens filter. Works as it should. Very clean and high quality. Screws on very well to my third part Fuji lens!

recently purchased a lens with a 58mm thread size, so I was out looking for a UV filter to protect my investment. One of the first things I learned about photography is that it is always cheaper to replace a filter than a lens due to an accidental scratch or abrasion. When you are out and about, you also don’t have to be paranoid about wiping off the surface of a filter, which often happens when you do not have the time to do it properly with a blower or a cleaning cloth. I have K&F filters on almost all of my lenses and have not seen any noticeable issues in using them. This package included a cleaning cloth, lens cap and a cap lanyard. Personally, I like to keep my OEM lens caps safe at home. If you sell a lens, it will always look a bit more attractive to most buyers with the original cap be it Canon, Nikon, Sony, etc. The lanyard is orange colored and very well made compared to others I have. Regarding the cleaning cloth, you can never have too many of these on hand. All of this was packaged in a clear hard plastic case which could be used for other items. For the price, I consider this to be a very good package to buy.

recently purchased a new lens for my dlsr. The first thing I do when I get a new lens is protect it with a clear, UV filter. I was very surprised to find that this filter came with a lens cap and a cleaning cloth! The filter screws in perfectly and the glass is extremely clear! I've had filters that added a haze to the photos, but this one seems to be of much higher quality as those junk Tiffen's brand. These will always stay on my lens unless they crack or haze up, which I don't foresee happening any time soon. A great filter to add to any lens. I am becoming a big fan of the K&F brand!!!

Please note I’m not an expert and nor do I own any equipment that can test the manufacture’s claims. I can only compare my experience with this filter vs my Hoya and B&W filters. I got the 58mm filter. The filter come in a semi-hard case. The filter kit includes a micro fiber cloth, pinch lens cap, and lens cap tether. The filter was clear and I didn’t notice any blemish in the filter. It threaded onto my Olympus 75-300mm II lens without any issues. Usually cheap filter can cause extra flaring or ghosting in your image when you have a strong light source. I took a several test pictures of different light sources and I did notice a very minor flaring/ghosting in the image if pointed just right at the light source. Another issue that cheap filters can cause is poor autofocus or decrease in image sharpness. I did not notice any of those issues. I did not notice any vignetting with this filter in place. K&F Concept sells several different UV filters. This is their basic filter which has 18 multi-layer coating but (according to their marketing material) is not Waterproof or Scratch-Resistant. K&F Concept does sell pricier UV Filters that will provide those features if you need them. For the low cost these sell for, I don’t feel you can go wrong with this filter if you want a basic UV Filter to protect your lens.

This isn't the first K&F Concept lens gear I've used, and it won't be the last. It's economical, and works as it should. Despite being inexpensive, the UV filters don't display any irregularities or distortion. Quite happy with it.

K&F Concept are good quality filters available at a reasonable price, always clean and clear glass. Highly recommended for your photographic needs

Looks a quality filter doesn’t impact on image quality

Used as a lens protector and does the job perfectly

it's nice that it comes with its own cap instead of relying on the original lens cap to fit properly.