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film speed


Guest venkat

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hi members

can any one tell me why people use film emulsion no. rather than ASA no. for exapmle dop says 5246 film but he will not say 250 asa. why?

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Because they are being precise. Kodak currently has a single 250 ISO (ASA is outdated) filmstock, but it replaced another from the past. And Fuji has two 250 ISO stocks, one tungsten and one daylight balanced. By giving the stock number it is the most accurate way to convey information. Between the two major manufacturers there are seven 500 ISO film stocks.

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yes, DP's use the numbers like 7218 and 7279 to indicate a specific product. in this case the kodak number indicates 16mm (=72 and 52 for 35mm) and two different 500ISO tungsten stocks. 18 is vison2 where 79 is the 'old' vision stock.

Fuji does the same thing: 86 for 16mm and 85 for 35mm.

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