Fantastic Variable ND filter. K&F Concept has really shown itself to be a quality manufacturer. I own around a dozen of their products and they have all performed perfectly and are made super nicely. This is no different. There is a sort of rough finish to the exterior of the filter so that your fingers wont slip and so that the filter doesn't accidentally slide out of your hands. The small ridge on the outer filter wheel allows you to get a good purchase on it so that you can really dial in the amount of ND you are looking for while reducing the likelihood of accidental fingerprints on the glass. The rings rotate very smoothly yet are solid enough that they wont jostle loose or get bumped out of alignment while shooting. The glass is very nice and I see no big color shift when using this filter, though some shifting is normal and expected. This filter was minimal

Vignetting is pretty common on VNDs, but they are minimal if at all present with my filter. The case is a standout, being constructed of a leather like material, large enough for the filter to just drop in and slide right out. A magnetic closure makes one handed use very easy. Also the package is very nice, and more presentation quality than utilitarian.

A stand out VND, and while there are cheap ones available on Amazon, this filter is better than any bargain filter I have tested by miles.