I was offered this filter for testing and, of course, took advantage of the opportunity.

I've been doing photography and nature photography for over 2 decades now, which is why I've already used a few filters.

These types of filters, i.e. gray filters or black filters, are used to increase the exposure time during the day.
A longer exposure time is used, for example, to make the flow of liquids softer, the same applies to cloud movements under changing lighting conditions or, as I often use, during thunderstorms during the day, to photograph lightning.

Of course, there are also much cheaper filters, but these usually have a blue tinge or falsify the color rendering or influence the depth of field.

In turn, there are also much more expensive filters.
If you use high-quality filter systems, for example, the filter glasses can cost twice as much as this filter here.
However, these are then not objectively dependent (scope). These are then inserted into a frame that is attached to the respective lens.
However, this makes the application a bit more complex and if such a window breaks during use or transport, it is extremely annoying.

This filter here is simply free of criticism when it comes to photography. I really can't make a point of criticism, but that should also be the case with the price.
It can be easily unscrewed and unscrewed, has no blue tinge or other color irritations and the depth of field is also perfect.

The package also includes a leather case with magnetic closure and a microfiber cleaning cloth.
As a little gimmick, you can convert the packaging into a small photo frame by attaching an enclosed piece of cardboard to the back.

Visually, haptically and technically, this filter does not allow any points of criticism and the yet impressive price is reasonable in this case, when considering market competition.

That's why I give this high-quality filter 5 stars.