Yes, JohnInKansas, interesting question as to why Adams didn't make a corrected negative; I've heard repeatedly that "straight" prints of his negatives are nothing compared to what he created in the darkroom, and have seen examples of the extensive notes and diagrams he kept for use in reprinting many of the negatives. I doubt if the guy would have snubbed any newly developed tool, other than if he really felt he could continue to get better results with his proven methods. I've also heard that, as a social animal, some think that he could never have been enough of a salesman to get off the ground financially without an agent; but, as an artist primarily expressing that part of myself via photography these day, I wish I could imagine I had a fraction of his magic.