The filter comes very well packaged in a box that can be converted into a picture frame. The actual storage takes place in a very high-quality leather case with an "ejection strap" so that you don't have to stick your fingers into the filter disc when taking it out.

The filter and its mechanics are very elegantly made, so the filter thread can be easily screwed in without any scraping noises and frequent attempts to attach it, despite the compact dimensions ("Slim"), and can be loosened again with moderate force after tightening, provided the internal thread of the optics is not damaged and is of the same high quality. The grooved areas are really helpful here, as you don't slide along the filter!

The "glass" of the Nano-X Pro series should be beyond reproach and be among the highest quality in terms of quality and workmanship. Of course, as a "normal snapper" this cannot be tested in detail without a laboratory, but the fact that it can be unscrewed without anything noticeably changing is a solid basis. The UV filter is of course only important for purist color film photographers, but it is not a problem for digital photography with this level of light transmission. Here, cleverly, the "protective filter" has also been included in the official product name. Otherwise, the filter is easy to clean with suitable accessories and does not seem to be a dust magnet.

I personally use the filter with a Z7 on the Z85 1.8 as a protective filter - I do not notice any loss; everything is still "pin sharp" and the bokeh is neutral, even in stronger (back)light conditions. However, true qualities only become apparent after various rougher sessions and filter cleanings...

Conclusion: If you want to play it safe with filters and really want to screw something high quality onto your optics, you have certainly found a potential candidate here.