Response to Best way to get ASA 640 out of Tri-X

It depends on the contrast of the scenes which you are shooting. If contrast is less than "normal" (e.g. less than 8 stops from darkest gray to lightest textured white), you can shoot at 640 and extend development time by 10-15% and the results will be about like what you get at 320 with normal development. If you are shooting high contrast scenes (like night-time available light), extending development or switching to something like Acufine will increase the contrast at the same time it builds up shadow detail. Developing normally will lose detail in the darker areas. There is, unfortunately, no way to "push" film without increasing the contrast (altho you will probably get lots of advice that using magic developer "X" will do so).

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