Quote Originally Posted by Michael Hoth View Post
thx,i used a step wedge-negative placing in the hasselblad filmholder, photographing a white card placing on zone X; did this with 5 films!

maybe the displacing of the negativ leads to an uneven illumination (i lost steps 30/31 and 1/2)

should i repeat shooting 5 films
No, I think it's expected to have a jump at 15-16-17 because those steps are near the edge. My edge densities are often "higher" than the inner densities. Just look at the overall trend and ignore the anomaly in the middle - consider it an artifact of the layout of the step wedge.