The filter comes very well packaged in a box that can be converted into a picture frame. It is actually stored in a very high-quality leather case with an ejection strap, so you don't have to poke your fingers into the filter disc when removing it.

The filter and its mechanism are very exquisitely crafted; the filter thread can be easily screwed in without any scraping noises or frequent attempts to attach it. After tightening, it can be loosened again with moderate force, provided the internal thread of the lens is undamaged and of the same high quality.

The special feature of this (ND) filter, however, is the ability to continuously adjust the filter degree/strength using the screwed-on brass knobs, which works very smoothly and impressively! This makes changing the filter largely unnecessary; a simple turn of the rotating ring is sufficient. The range in which the filter effect can be changed is enormous. For example, from f/13 to f/5.6 at the same exposure time or at a constant aperture, the exposure time changes from approximately 1/4000s to 1/320s. This eliminates the need for several filters and allows for fine and easy adjustment to achieve the desired effect! Combined with the K&F quality of the Nano-x Pro series, the price is also put into perspective.

Personally, I'm absolutely thrilled; I've never had so much fun with a filter...