I think using higher grade of paper on lower gradient negatives amplifies the toe, giving you the "ability" to reach more into the toe. Thus making film "speed" faster than intuitive. You would think underdeveloping would cost speed. But the ability to amplify keeps that from happening.
Originally Posted by Michael R 1974
I also think the Delta-X is meant as a means to estimate 0.3G, if you can find 0.3G by computation, then by all means find 0.3G
Why does ZS come up one EI lower than ASA/ISO? I think deserves a thread of its own.
p.s. I started a thread.
Last edited by Bill Burk; 03-09-2013 at 02:10 PM. Click to view previous post history.
Reason: linked thread