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When people say they "push" their film, what they almost always mean is that they "pulled" exposure (i.e. underexposed) and as a result the film needs to be "push processed". Since you "pushed" exposure, you need pull processing to compensate. That is, if you think you overexposed by about two stops, then under develop ...


If you've overexposed, you want to pull rather than push your film. Film pushing involves developing to higher than normal contrast, which causes a given exposure to produce more density. Since this is proportional to exposure, exposures barely recordable move up to low-mid tones, middle exposures move up to high-mid, and highlight level exposures "...


ISO 100 (EV9/EV11;EV10/EV12) is w/in the exposure latitude of HP5 (many rate it at ISO 200 normally), you don't really need to adjust the developing time at all (you'll just get higher contrast results)... but if you decide to, I wouldn't go much more than 1 stop.

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