Delta 100 Characteristic Curve 2.JPG
I measured the densities of the negatives again using 1.4 stops more light (by reducing the size of the projected image) to see whether this reduced the abrupt flatting at the shoulder. It did have some effect, with density continuing to increase above normal + 8 stops exposure. This suggests that the reason for the flattening was measurement error at high negative densities.
The new measurement also shows the straight line portion of the curve to extend from -3 to +7 EV referenced to normal exposure at ISO 100. Gamma of the straight line section is 0.61, which is consistent with "normal" development.
Last edited by andrew.roos; 01-01-2013 at 08:54 AM. Click to view previous post history.