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The numbers refer to film speed or ISO; witch is another way of saying sensitivity. Each of the standard ISOs (listed bellow) is twice as sensitive as the one before it. The higher the number is the more sensitive the film. While a higher sensitivity film will allow you to shoot in lower light conditions it increases the appearance of grain. Not sensitive

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Q: What does it mean when film for photographs are 200 or 400 or 800?
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