The KF Concept neutral density filter is – as expected from other products from the brand – of high quality and comes in a secure and practical case. Thanks to the special coating of the Nano-X series, there are no unwanted light disturbances in the image during use. Furthermore, the resistance to scratches is increased, which I can truly confirm. Especially when using it outdoors, I often come into contact with dust, dirt, or other obstacles, but so far, these have not caused any damage to the filter. The filter's excellent dust and water resistance is also worth mentioning! The filter's imaging performance is very good, as expected. The aperture stops can be precisely adjusted and are a blessing for my 28-75 2.8 lens. This allows for longer exposures even at wide apertures and achieves great bokeh in bright daylight. In terms of image sharpness, I couldn't detect any differences between images with and without the filter. There is only a slight color distortion towards warmer tones. But this is nothing that can't be corrected in post-editing. The filter also demonstrates its strengths in video. Thanks to the continuous adjustment of the aperture stops and the easy and smooth adjustment mechanism, smooth and steady aperture transitions can be achieved. This is a huge advantage, especially with older cameras! For such performance, every amateur photographer should be willing to dig a little deeper into their pockets. With this filter, the current price of around €80 is definitely worth it! It's clear from the outset with filters like these that the image will not be distorted. However, since these changes are quite manageable compared to competing products and can be edited out later, this is not a criticism for me. Therefore, a full 5 stars and a clear recommendation from me.