I have now extensively tested this “K&F Concept Nano-X PRO Series ND1000 filter” and would like to share my experiences today:

First of all, I was pleasantly surprised by the packaging, because “K&F” really took care to package this “Pro” filter attractively. In addition to a cleaning cloth, you also get a leather bag to store the filter. The bag is very well made and gives a high-quality impression. The filter itself is also very well made, I ordered it from Sony for my two 67mm lenses. The filter has a brass frame and can be easily screwed onto the lenses. It's also not too bulky due to its slim design.

The surface of the ND1000 filter has been coated on both sides with a 36-fold nano coating, and K&F states that the filter is waterproof, dirt-resistant and scratch-resistant. I even involuntarily tested the durability of this coating, because I fell it onto the dirt road when I unscrewed it from the lens, but nothing happened to it and its surface. The surface was easy and easy to clean afterwards, I am very satisfied with the coating. Of course, I wouldn't let it count and therefore recommend that you handle the filter carefully.

The filter enables long exposures in daylight, as you reduce 10 aperture levels with this neutral density filter. I also uploaded an unedited photo with a 30sec long exposure, which I took on a river with my Sony Alpha 7iii and the “K&F Concept Nano-X PRO Series ND1000 filter”. I've already taken several photos with the filter and I'm very satisfied with the image quality. I did not notice any visual impairment due to the use of the filter.

I really enjoy shooting with the filter, I am very satisfied with the results of the photos. I will definitely continue to use this ND1000 filter from “K&F”. I can make a recommendation.