The Grauverlauffilter has no color cast.

He is very well made. Very advantageous is the screw-pin to rotate the filter can precisely. So you can also lay simply declare that the pin should show toward the sun, while photographing.
Because of the set screw to screw the filter is not the thinnest of its kind.

The thread is well made.

The course ends in the center, but this is not disturbing at Horizon third division in the screen layout. On the product photo, it looks like the upper course greatly ends towards the center, but what he does in reality. Man kan the horizon good place in the lower third, without getting strange effects in the brightness curve.