Actually, you don't need a UV filter anymore these days, because camera manufacturers have been installing such a filter in front of the sensor for many years. However, there is one application in which a magnetic filter is useful and practical: If you have already fitted your lens(es) with a magnetic filter adapter, then a lens hood will generally no longer fit. However, this offers the best protection against, for example, accidental bumping. Without a gel, the front lens is exposed. And that's where this UV filter comes in, but a neutral glass filter would have done just as well. Now, filters generally have a negative effect on image quality, the only question is how much. This filter is very cheap at around 20 euros (67 mm) and I think the quality is OK. Flares (backlight that leads to unwanted reflections within the lens) seem to be much stronger to me, but it depends a lot on the lens anyway and a lens hood is always better than a better filter, unless you can avoid flares or even use them deliberately. There are two aspects of handling that bother me: the filter box is designed for much larger filters (I estimate 82 mm) and does not have a suitable recess for this 67 mm filter. This means that not only is the box much larger than necessary, but the filter also rattles around in it during transport. Solution: use your own filter bag, in the right size. The magnetic holding force between the filter and the lens adapter is weaker than that between the filter and the front cover. If you take the front cover off, this UV filter is always attached to it. For 20 euros, this filter is extremely cheap, technically/optically OK, but in practice it does show some small weaknesses. The fact that you basically get protection that can be removed quickly and that you don't have to spend a long time screwing on makes the filter still worth recommending.

I'm actually a fan of K&F products, but this time I'm disappointed. My lens hood doesn't fit the lens when I've screwed on this UV filter. That bothers me so much because I want to reduce flares with a lens hood, especially when there's additional glass in front of the lens. My older UV filter from Hama, which I always used to attach to the Sony 28/2.0, proves that this can basically work. But it's not magnetic and so can't magnetically hold other filters. That's what I found so appealing about this one from K&F. Apart from that, you get a UV filter of the usual high quality at a reasonable price. If you don't use the lens hood anyway, you can certainly buy this one without hesitation. I'll probably only use it rarely.

This UV filter from K&F is basically good and does what it's supposed to. The glass is very clear - I was confused at first because I couldn't even see it in the filter frame. There is no impairment of the image quality and the filter is therefore ideal as additional protection for the lens. Although the magnetic mount is actually practical: due to the slightly wider edge, I can't use the lens hood at the same time (at least with a Fujinon 18-55mm).

I now have this amazing filter attached to my Olympus 60mm macro lens. The lens has no lens hood, a bad front cap and obviously no filter. This is now on board, along with a tidy front cap and third-party lens hood. 46mm is a little small and fiddly, but this one has a really good knurled ring that feels good in the hand. The thread is also very smooth and positive. The color balance is imperceptibly different, so it doesn't bother when shooting in well-lit close-ups. I love the improvement on this brilliant lens. ricky

Easy to use, easy to install, compatible with lens cap and lens hood. Fog filters are used to add cinematic flair to your photos or videos. Diffusion filters around your lights or objects like a misty "dreamy" halo. I definitely recommend adding this filter to your collection!

I'm really happy that this filter can be screwed onto my Nikkor Z 24-70 f/4 S with the lens hood in place. Obviously I need to reach into the lens hood to adjust the filter, but that's ok. No vignetting that I can see.
The filter works great, nice smooth action and a great range of density.

Granted you have to put the magnetic ring in the hood first, then the filter, but it connects to the magnet and since this lens has a handy little sliding door, I can adjust the variable ND filter... lol..

I'm really happy that this filter can be screwed onto my Nikkor Z 24-70 f/4 S with the lens hood in place. Obviously I need to reach into the lens hood to adjust the filter, but that's ok. No vignetting that I can see.The filter works great, nice smooth action and a great range of density.