I have tested this “K&F Concept Nano-X PRO ND Filter 67mm Variable Neutral Density Filter ND2-32 (1-5 Stop)” extensively with my two 67mm Sony lenses (85mm + 24mm focal length) and would like to share my experiences today: I find

the packaging of the filter appealing, because “K&F” has packaged this “Pro” filter in a very high-quality way. You will receive a bag with leather parts, which is softly lined on the inside and is used to store the filter. In addition, an extra packed cleaning cloth is included. The bag has a magnetic closure and is very well made all around.

The filter itself is also very well made, it has a brass frame, on which the markings of the individual “stops” from 1-5 are easy to read. Turning the filter is easy but not too easy either. I also find it nice that 2 “handles” have been installed to rotate or adjust the filter, which makes adjustment even easier and more convenient. There are no resistors at the individual stops, so you have to look carefully at where you turn the filter. Especially at Stops 4 and 5, there isn't much space left in between, which requires a closer look. The individual stops also mark the aperture levels that you reduce with this filter. If you select Stop 3, for example, you reduce the incidence of light by 3 stops, which allows you to achieve beautiful results with longer exposure times, especially in landscape photography. But such a variable ND filter is also useful in videography in order to be able to react to different light effects without changing individual filters.

The variable filter can be easily screwed onto my two lenses. The filter also doesn't add too much weight to the lens. The filter has a 36-fold nano coating on both sides, making it waterproof, dirt-proof and scratch-resistant. The coating makes the filter robust and I assume that this makes it durable and that I can shoot or film with it for a long time.

I've already been shooting in the landscape with the filter, I'm very satisfied with the image quality. I didn't notice any optical effects from using the filter, not even with my 24mm wide angle lens.

I can recommend the “K&F Concept Nano-X PRO ND Filter 67mm Variable Neutral Density Filter ND2-32 (1-5 Stop)”