din

Discussion in 'Minox' started by bill__|1, Nov 27, 1999.

  1. how do you conert asa to din?
     
  2. DIN -ASA TABLE
    DIN ASA
    6 3
    7 4
    8 5
    9 6
    10 8
    11 10
    12 12
    13 16
    14 20
    15 25
    16 32
    17 40
    18 50
    19 64
    20 80
    21 100
    22 125
    23 160
    24 200
    25 250
    26 320
    27 400
    28 500
    29 640
    30 800
    31 1000
    32 1300
    33 1600
    34 2000
    35 2500
    36 3200
    37 4000
    38 5000
    39 6400
    40 8000
    DIN stands for Deutche Industrie Norm. Film speed doubles every 3 degrees, it is a logarithmatic scale.
    ASA stands for American Standard Association. This is a arithmetric system. Film speed is proportional to ASA number. Each step increases by the cubic root of 2= 1.25, two steps by 1.6, hence the number ASA 125, 160, 250, 320 ETC.
    Old British stand BS number = ASA number.
    The International Standard Organization ISO number is a combination of ASA/DIN.
     

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