It does its job quite well. In the last 2 very dark shades, it shows unevenness in the darkening that resembles a bad vignette.

In the first 4 stops, it's fine, then it starts to darken more intensely around the edges like vignetting. I liked the result in the first stops.

Build quality is great and the glass is high quality, no loss in sharpness of the images. However it does not have hard stops (which I prefer in a VND) and it has a strong color cast and loss of color/contrast making it practically useless under the Greek sun. It also has the dreaded X at max strength. For photography I recommend a series of (magnetic) filters and for video find a higher quality one, maybe with step up rings to save cost.