K&F Concept Nano-K Optisch Glas UV-Beschermingsfilter met Nano Coating voor 86mm Lens (Inclusief Schoonmaakdoekje)

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I got mine yesterday and said I would test out the performance with and without this filter, I have a vintage Minolta lens which was my grandad's so it is quite precious to me and I wanted to keep it from getting damaged, As the title says there is slight yellowing, vignette and a barely noticeable loss in sharpness that I can notice while looking at it on my computer screen, although the compressed pictures I have added may not show the full resolution of the original images.Let's break down what I have found:The yellowing - There is a slight yellow tint to this filter which makes sense, it's a UV filter so the shorter wavelength light may have some trouble getting through, This is no issue to me as it can easily be tweaked and fixed in software after to add a little extra blue, or this might give you better results in the field depending on your conditionsThe vignette - This is ever so slight but noticeable when looking at the same picture with the filter on and off, this again is no problem to me as it can be fixed or tweaked in software so that it is indistinguishableThe loss in sharpness - The loss in sharpness is barely noticeable even at 400% which is great, simply adding 1 percent more sharpening afterward makes this a complete non-issue for me. You have to be looking at the photo at 200% or above to notice any kind of loss and even at that, you will have to look hard.For what I paid for this filter I am happy knowing that it is not degrading my image in any meaningful way and that it will act as a shield and protect my glass from scratches and dust, I will be adding more of these for my lenses and will not be compelled to remove the filter to take a photo as I would be with others, Great product, Highly Recommend!

Have more coating, good quality, but if you have a variable nd filter then it's a waste of money.

This is a great good quality UV Filter. I use it all the time and it also serves as a protector for my Nikon camera lens

Basically, this acts as an additional layer of protection for your expensive lens. I personally don't opt for expensive filters like Hoya. It does the job perfectly with a tiny budget. Also, it comes with 3 microfiber clothes with separate sealed packs. Which is worth mentioning.

K&F do make some decent gear for the money I've found and this UV lens filter is no different. Honestly this is supremely well made with a high quality finish and a perception of a properly expensive bit of kit.Now, I do appreciate that the jury is out on whether a UV filter is or is not needed and on that subject I have no real feelings. What I do like though is that using a UV filter prevents damage - within reason - to my actual lens. Okay, I get the fact that if I drop my camera off the back of a truck it's not going to survive, but having that lens filter does stop minor scratches and abrasive dust. It also keeps my fingers away from the lens and being flat easy to clean thoroughly with a cloth.Overall a no brainer for me. I always put a UV filter on my lenses immediately upon purchase simply to add a bit of protection and K&F do some great ones for entirely reasonable money.