I've broken down my review into reasons for purchase, first impressions, product testing, suggestions for improvement, tips, and conclusion. I hope this helps with clarity.

I received the product for free as a Vine product tester, but this doesn't affect my rating. I also only test things that I can use myself and integrate into my everyday life.

Reason for purchase:
I ordered this filter for two reasons. The first is that when I want to travel light, I don't want to carry my entire clip-on filter system with me. The second is that I can use it well in videography, where I mostly film according to the 180-degree rule. This means that to achieve a cinematic video image with a certain amount of motion blur in the individual frames, you film with a shutter speed of 1/fps x 2. For example, if I film at 50fps, I need an exposure time of 1/100th of a second, which is impossible to achieve without an ND filter, especially in the wide-angle range in sunny conditions.

First impression:
The packaging looks very classy, ​​but it certainly has a right to be, considering the price of the filter. The filter is housed in an equally attractive and high-quality filter pouch, something I've never seen before in this form for round filters. The flap on the side allows you to lift the filter to prevent accidentally touching the glass when removing it. The pouch has a magnetic closure. A nice gimmick is that the filter's cardboard box can be transformed into a small picture frame.

Product test:
The filter feels fantastic to the touch, heavy (91g) and easy to grip. I also really like the color-contrasting adjustment aids. These are removable if you still want to use a lens hood. You need a small micro-Torx wrench, e.g., from a precision mechanic's set. Adjusting the filter is buttery smooth across all settings.

In our test, the filter showed no weaknesses. I didn't notice any color cast, and there was no X-cross effect. The promised effect of up to 5 f-stops is maintained. Technically, it's perfect, and that's the most important aspect of an ND filter.

Suggestions for improvement:
1. The sustainability aspect, as reflected in the use of cardboard as a picture frame, could also be reflected in the filter bag by avoiding the use of animal products (leather).

2. An 82mm version would be desirable and recommended, as this would allow the filter to be used on my 24-70mm/2.8, for example.

Tips:
It's always advisable to buy such a filter in the largest possible diameter so that you can adapt it to as many lenses in your fleet as possible using step-down rings. However, this would also eliminate the option of continuing to use a lens hood.

Conclusion:
A technically perfect filter in the higher price segment.

I hope my review has helped you make your decision.