K&F has now earned a fairly good reputation among photographers, not least due to the very attractive price-performance ratio that K&F products generally offer.
And now, K&F seems to be reaching for the stars and, with the Concept Nano-X PRO series, wants to reach the segment of customers who value high-quality products and are willing to pay accordingly.
I tried to find out whether this will succeed using the Nano-X PRO Variable ND Filter.

With the Concept Nano-X PRO series, K&F, as already mentioned, wants to reach pro users, and these users typically rely on filters from well-known brands and are willing to pay accordingly.
And I've already had the opportunity to experience extensively in the past that K&F is quite capable of producing good filters. Of course, a little compromise had to be shown here and there, but that was quite bearable, especially considering that the filters were previously more in the affordable segment. Things are completely different with the Nano-X PRO series. If K&F wants to live up to the price, they have to deliver unconditionally.
And yes, they do… starting with the materials, the workmanship, and even the quality of the coating, with the Nano-X PRO series, K&F no longer makes any compromises and demonstrates what is technically possible.
Gone are the days of stiff threads or seized filters! The ultra-precisely manufactured brass mounts of the Nano-X Pro series run as smoothly as butter and convey the feel of a Peter McKinnon Polar Pro filter