This K&F Concept Magnetic 58mm Lens ND Filters Kit is surprising good quality, everything from the packaging, to the storage carry case, to of course the filters! They fit my fuji xt2 stock lens perfectly. I do wish there is another GND filter in the kit. The magnetic filter snap on and off easily (but carefully!). I am not a photography expert but these seems great quality! I am very pleased with this K&F kit.

From the golden outer packaging comes a microfiber cloth wrapped in foil and the actual filter box. Inside is a filter that is oversized and heavy for the screw-in size. I have the filter in screw-in size 82mm and am testing it on the Leica Vario-Elmarit-SL 2.8/24-70 with the Leica SL2s.

The mount has a grooved grip ring for screwing in, which protrudes about 1 cm over the filter mount. This makes it easy to grip and screw in or out. There is no fiddling when changing the filter and no dealing with filter clamps when the filter is stuck! The manufacturing quality of the mount is excellent. The entire front frame of the filter has to be twisted to adjust the strength of the polarization. The screw-in knurled ring must be held in place because the rotation of the polarizing filter is difficult. The difficulty is not a design or manufacturing defect, but is for the 2nd function of the Filter is required, namely the darkening from factor 2 to 32, which is adjusted in the front part of the filter holder with 2 relatively large and easy-to-grip levers. If the polarizing filter adjustment were smoother, it would rotate with the ND adjustment.

The overhang of the filter holder makes a larger filter glass possible than with conventional screw-in filters, so that the thick filter does not vignette even at a 24mm focal length. The filter glass is visibly multi-layer coated; a water-repellent nano coating is applied to the front. The original lens cap can be snapped into the filter! All of this gives the impression of a very careful and well-considered design.

Polarizing and ND filters work as usual. There is no particular susceptibility to reflections and stray light. I cannot detect any impairment of the sharpness or an explicit color cast of the lenses. Of course, using the polarizing filter outdoors causes intentional color changes by filtering out the sky reflections, which means that, for example, green plants have a lower blue and a higher yellow component.

One basic problem with using the polarizing filter with mirrorless system cameras remains: except for reflections aimed at at an angle, the strength of the filter effect is practically undetectable on the OLED viewfinders. Landscape photographers who prefer polarizing filters are therefore recommended to use a DSLR with a mirror, in whose natural viewfinder image even small rotations of the polarizing filter are clearly visible. But this is not a fault of this filter, but rather affects polarizing filters in general.

Conclusion: A very carefully and practically constructed double filter at a very attractive price in comparison!

Great product & well packaged.
Easy to use and less fiddly than trying to screw filters in with the lens hood in place - especially the ND filter after pre-focussing and framing the image.

I bought a Helios lens 58mm f/2 M42 for use on the NikonD5600. I use it with no problems. Thank you very much.

Fits perfectly on a 58mm lens. No impairment of the picture. Good lens protection.

Great for the price, does what I'm supposed to do.
Haven't tried this new one yet but I'm assuming it's the same as my 58mm I bought a few years ago. Great quality and I really like the packaging with the little tin to protect it when not in use. Also included is a handy little lens cloth. I only ever carry a 6-stop nd as I think it's a great middle ground for long exposures. By matching this to your lens and stopping down the aperture, you can always get the exposure you want, especially at sunrise or sunset. If you are shooting at noon, 10 stops may be preferable. Image quality is great and less color cast than many other so-called professional options on the market.

Socket for mounting EF cinema lenses on Fuji x-t3, it does its job. I would have liked there to be a screw mount to support the lens from the back as well. For the main lenses, the adapter plays a bit of play on the Fuji mount. Even if the owner Regilent is mounted on the bars.

Suitable for M42 screw on lenses for Pentax DSLR mount.