Quote Originally Posted by ic-racer View Post
I don't use your same testing method, so I cannot comment on your times. I get good prints with my equipment using a gradient around 0.75 and printing on multigrade paper.

I can say that if exposure is having an effect on the gradient there is a major problem in your method; like the values of your stepwedge are not evenly spaced or not evenly illuminated.

If you are not interested in calibrating your system for 'speed' then a contact print of the step wedge may be less problematic for you.
I measured the original step-wedge—those numbers are also in the spreadsheet—and it seems quite even. I don't know if the 70% reproduction scale has any effect, though I would not think so.

How would I contact print a transmission step-wedge to a negative using natural light, with accurate timing? And also, how important is it that I do this test using natural light? Ralph, in his book, seems to suggest that it is important.