It's the classic Kodak Darkroom Dataguide with time/temperature computing dial. Not totally up-to-date development times for all films and some Kodak developers not given, but it's well worth the money. I use a Jobo rotary processor with continuous agitation, so I have to adjust development for that, but if I want to change temps, the dial does that for me. One of the best things are the depth-of-field computing dials. Strangely, in this day of autofocus cameras, these can be some of the most useful things in the entire book.
Verified purchase: Yes | Condition: Pre-owned
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