Pioneer
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I have both the Simmons book and the Stroebel book. Of the two, I'd recommend the latter.
I recently received the revised edition of the Simmons book and was disappointed. There's very little change from the original, and despite it having a copyright date of 2015 the chapter on film still talks about Kodachrome, Panatomic-X, and other films that haven't been available for a long time.
I haven't compared my original copy with the revised edition page-by-page, but it looks like the changes (if any) are very minimal. If you already have the 1987 edition, there's no reason to get the revised edition.
Thanks for that info SodaAnt. For now I am working through Ansel Adams' books. I do have the other two books and will get to them when I am able but I don't think I'll be buying any updated editions for now.