Q: Souping APZ in D76/TMax dev.

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In trying to find a develpment time for Agfa APX 400, using D76 or TMax, I was directed to a very useful chart at http://www.digitaltruth.com/. But the times listed there for these two soups indicate the ASA for the film is 250. What does this mean? Is it a recommendation that the film be rated @ 250 and developed for the recommended times? If so, why not just provide the times to develop straight? This isn't a pull-developing time chart - that's elsewhere on the site. Take a look at the chart for Agfa APX 400, and tell me if my thinking is skewed. I'm still looking for an appropriate time for either of these developers, should I just take the recommended ASA 250 time and extend it?

-- James Goheen (jago@interlog.com), August 23, 1999

Answers

ISO film speeds are just recommendations--actual film speeds may vary due to meter sensitivity, lens flare, type of developer, agitation techniques, and a host of other minor factors. The person who posted the speed of 250 for T-Max 400 was simply giving you the speed that he/she had found worked best for them. My speed for T-Max developed in Rodinal is 250, but I use 400 for PMK. See my charts at http://unblinkingeye.com. I think you can probably get a full 400 if you use T-Max developer at the recommended times on the bottle--my problem with T-Max developer is its expense.

-- Ed Buffaloe (edbuffaloe@unblinkingeye.com), August 25, 1999.

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