 John Gill |
Pushing Film Hi, I was just wondering how much the quality of a print would be decreased if I pushed a ISO 400 film to 1600 or even 3200. I usually use Fujifilm Press 400 or Professional 400 without a flash
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Tom Darmody |
What are you shooting?
I wouldn't go more than double the asa when pushing anything. Your prints are going to be way underexposed. Tom
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John A. Lind |
Some films are intended to be pushed. Two of them with multi-speed emulsions designed specifically to be pushed by two stops are Kodak's TMax P3200 and Fuji's Provia 1600. The nominal ISO rating for TMax P3200 is 800 (or 1000 depending on specific chemistry used to develop it). The nominal ISO rating for Provia 1600 is 400. If TMax P3200 is used at EI 3200 (and similarly Provia 1600 is used at EI 1600), it must be processed "Push 2." Some films are "friendlier" to being pushed than others. Yet a third film, Agfa Scala 200X has a nominal ISO speed rating of 200. It can be pushed up to two stops to EI 800 or pulled by a stop to EI 100 (the opposite of pushing). When pushed (or pulled) the film developing must be modified to compensate for the underexposure. The most significant modifications made are the time for some of the processing steps. Consumer labs cannot handle this, but full-service pro labs offer push (and pull) processing. Pushed and pulled film must be developed separately, apart from normally exposed film. One pays a premium for it with an additional charge tacked on to the normal film developing cost. It's usually several dollars per roll. In general: -- John
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