I used this Magnetic ND Filter ND8-ND128 which is a pretty good wide angle lens and I didn't observe any vignetting which is a good thing. There was no visible loss in image quality as well as across the entire gradient. Installation is very easy, happy to recommend!

Very easy to use. The filters are easy to replace and firmly padded.
Easily interchangeable and no nuances that are not unchanged in the photo

Received within the agreed period. I think for a beginner like me they are of pretty good quality. And the fact that they're magnetized seems like the bomb to me, the thing about not having to screw them in is milk.
I think it's a good product. I am happy with the purchase.

This set of filters surprised me not only because of the convenience of use and transport, small footprint, minimal weight, but also because of the returned image quality. Photos are free from chromatic aberration, ghost lights or unwanted reflections (see photos attached to this report). Very handy especially when I go out with family.
The picture quality is really GOOD. I posted images to demonstrate the lack of obvious chromatic aberrations by enlarging the image to 100%.

The truth is sometimes awkward to carry the spiral filters, especially in adverse situations where, for example, it's cold and you're wearing gloves, there's a lot of wind, you're very close to a waterfall, and there's spray, etc. It has also happened to me once that I put the filter on the target for a while and then took it out so I found it interesting to try the K&F magnetic filters, I find it a comfortable system with a good one Price-performance ratio.

I have a long history of shooting with special effects filters. I've used Cokin systems where you can share a filter with different lenses using adapters. I own over 50 such filters and lately I've been simplifying my camera bag and traveling with just a few filters. My favorite filters are the Graduated Neutral Density (ND) filters. With these, I can rotate the filter to my liking for each shot. BUT it means I have to wear more than a pair of the same ND filter but on different stops.

Solution: The K&F Concept magnetic variable ND filter gives me the opportunity to use a filter that covers 5 stops within seconds. This is a great time saver as my landscape or sunset shots sometimes require quick image setup and adjustment to rapid light changes.

ND filters are an investment in your camera equipment. These filter out very bright light and enable the photographer to take longer exposures in daylight. My favorite use of ND filters is to make water movement look silky while still capturing the surroundings in detail. This K&F Concept filter is amazingly well built. The glass is better than my cokins. Because it's built for specific lens size diameters, I had to rationalize which lens I used most often and order that size. 58mm in this case.

The housing is a worthy vault for this filter. Kudos to the team that developed this feature. The magnetic ring screwed well into my existing lens. In fact it screwed in too tight, it took me 10 long minutes to unscrew it later.

The magic is in the magnet technology. Wow! It was instant on and instant off for the actual ND filter. Great. With that comes the fear of dropping the filter. I'm afraid a bump will loosen it, so I kept my hand on the lens the whole time. If you're in a stationary environment, you should be fine.

This lens filter is a great tool for many future vacation shots. Easy to carry and use.

Note that you cannot place a regular lens cap over the ND filter. Too bad.

Overall, I love the new direction these ND filters are taking. There is less effort and more time is spent on actually capturing images. Try it. I recommend this variable ND filter. 4.5 stars.

This is one of the best additions to our camera since we've had it. It's very easy to install and once in place it stays in place thanks to the alignment slots on the back.
Adjusting is very easy once it's snapped into place. We like the infinite variability that allows you to perfectly customize your settings for each scene.

I have to say that I have never used filters - this is my first try.
I like ND filters. I don't see any discoloration or Sharpnes loss in images.
I wish they had a set for 92mm lenses.

The results with the filters are outstanding and I am absolutely satisfied with the image quality that you get with them. All the colors are even and come out great. With a little practice, you can get almost professional pictures even as a hobby photographer. It is definitely helpful that the entire equipment is very light, compact and handy, which makes it really easy to transport and take with you on the go.

with the variable ND filters you have significantly better setting options than with fixed ND sizes.
The picture is evenly darkened, at least I can't see any gradients on my pictures.