Some say you don't need now with digital photography, but I have always bought a UV filter to cover all my lens. Never have to worry about fingerprints or dirt and dust getting on lens. Great price and very well packed, love the case it comes in.

UV filters are a lot more useful for film as UV affects film way more. However this is still useful for protection, both from UV if you are shooting a lot and also from dust and other particles. There is almost no visible difference between having it on vs having it off in most circumstances so if you want a little more protection on your lens, this is perfect for you.

Excellent. It delivers what the manufacturer promises.

Very good quality It fits exactly. Nothing sticks out. Lens hoods can also be used as before. I bought the filter to protect a lens. The filter works as in the description and does what it is made for. Simply outstanding.

Bought for my new Nikon 780. Great filter, well made and great picture quality. Will buy again.

Perfect for protecting my lens. No chromatic aberration and no color change.
Reasonable price!

The filter is very well made, easy to screw in and does not significantly impair image quality! The packaging, although oversized for a 49mm filter, is also very neat and of high quality.
Unfortunately, the lens hood can no longer be put on because the filter edge is a bit too thick; this is the case with my Sony FE 28mm f2.0. It is therefore useless for me and is returned with a heavy heart.

Although many professionals say not to bother with lens filters, I am clumsy and wanted to protect an expensive lens from finger-prints and accidental knocks. The three things that attracted me to this lens were a) the 99% transmission claim, b) the slim frame, and c) the price (not the cheapest, but not that expensive). On my 100-500mm lens, its use is subtle, but noticeable.

A minimally applied UV filter of very good quality and a sturdy storage box - I can only recommend it...
Not to be despised either: A sturdy round box for storage (including other filters not currently in use).

A UV filter may help the look of some outdoor photos in bright sun, but honestly I can't see much difference. I use UV filters like most people do, as a way to protect the front element of my lenses. If you're shooting someplace where the lens could get stuff on it, like in the rain, at the beach (salt spray), or the pool (splashes), at a party where people might be getting sloppy with drinks or around kids/pets who might reach out and touch the lens, a UV filter is good protection. It's much easier to clean a filter than the element on an expensive lens!

Of course for this purpose you want a filter that won't degrade the quality of your images, so far as I can tell this one does not. I haven't noticed any visible darkening or color shifts, in fact when I first opened the box for a second I thought there wasn't any glass in the filter ring! So overall I think this will offer some protection to your lenses without changing picture quality. And of course, if you're someplace that isn't hazardous to your lens you can easily take the filter off.

While it's not a downside, I do kind of wish K&F would standardize their filter cases. I have received 3 different kinds already, and it would be nice if they had a stamp/sticker on the outside so you can quickly tell which type of filter is in the box! Luckily, I have a label maker.