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[photo-3d] RE: ASA<->DIN

  • From: "Sergio Baldissara" <winter@xxxxxxxxxx>
  • Subject: [photo-3d] RE: ASA<->DIN
  • Date: Sat, 8 Apr 2000 17:52:28 +0200
Yes, I forgot the SQR(2) factor... so GN100 (Imp) for 100ASA or GN30
(metric) is correct.
Without difficult calculations, to convert °DIN<=>ASA, just remember
20°DIN=80ASA, 21°DIN=100ASA, 22°DIN=125ASA... speed dubles each 3°DIN, so,
f.i. 27°DIN=400ASA.
btw: in Europe we no longer use the DIN (Deutche Industrie Normen) scale. We
adopted the ISO scale... what's that? Just ASA with a different name! I
still  wonder why  somebody decided to change the name (perhaps to confuse
Yanks?)...




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