Introduction

`Film Speeds

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October 2001 Older cameras which incorporate exposure meters, and older exposure meters, are often calibrated using now-defunct film sensitivity rating systems. This table provides conversions for ASA and DIN to many of the old systems, although it should be noted that the conversions may not be exact. ASA   Weston G.E. H&D B-Welcome Eur. Scheiner US Scheiner DIN Ilford 2.5 15 2 3 75   16 11 5   3 16 2.5 4 100   17 12 6 A 4 17 3 4.5 125 1/3 18 13 7   5 18 4 6 160   19 14 8   6 19 5 8 200   20 15 9 B 8 20 6 10 250 1/6 21 16 10   10 21 8 12 320   22 17 11   12 22 10 16 400   23 18 12 C 16 23 12 20 500 1/12 24 19 13   20 24 16 24 640   25 20 14   25 25 20 32 800   26 21 15 D 32 26 24 40 1000 1/24 27 22 16   40 27 32 50 1300   28 23 17   50 28 40 64 1600   29 24 18 E 64 29 50 80 2000 1/48 30 25 19   80 30 64 100 2500   31 26 20   100 31 80 125 3200   32 27 21 F 125 32 100 160 4000 1/96 33 28 22   160 33 125 200 5000   34 29 23   200 34 160 250 6400   35 30 24 G 250 35 200 320 8000   36 31 25   320 36 250 400 10000   37 32 26   400 37 320 500     38 33 27 H 500 38 400 640         28   640 39 500 800         29   800 40 640 1000         30 I 1000 41 800 1250         31   1280 42 1000 1600         32   1600 43 1250 2000         33 J Top of Page

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