The film speed is referencing to the film's sensitivity to light. If you were shooting in low light conditions at a concert or outdoors. So if I was to photograph an outdoor party with a film camera and it was 10pm, I'd want to be using a film that has a higher ISO, anything over 400. The downside is that the higher the ISo, the more grain.
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timeasmymeasure
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Date: 2010-06-20 11:49 pm (UTC)Nadine//Claw