Quote Originally Posted by Michael Hoth View Post
I assumed that zone 3 is in the range of about 0,37 (the value 0,37 is also an average value of the black shirt).
For me its clear, all those tests with the step wedges dont come up with the reality.
There are just 2 specific points on the curve that can be very closely controlled by you------the speed point, or the point that will define the effective speed that is found (in the ZS, it is a short range of 0.9D to .11D at Zone I)------and, the upper density limit that defines your "normal" development target (for me, it's in the range of 1.25D to 1.35D at Zone VIII). IMO, it is somewhat, for lack of a better way of putting it, pointless to be concerned about a specific density between those points----those points that determine the shape of the curve between the two target points, are very much dependent on the film and development combination, just my opinion.