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[photo-3d] ASA<->DIN

  • From: "Sergio Baldissara" <winter@xxxxxxxxxx>
  • Subject: [photo-3d] ASA<->DIN
  • Date: Fri, 7 Apr 2000 15:59:39 +0200
Bob,
it's hard to de-cript
> GN 50 ASA 25 DIN 15 in feet
25°DIN=250ASA, 25ASA=15°DIN (film speed doubles each 3°DIN); so I should
assume GN=50 (in feet) for 25ASA speed film.   that would mean GN=200 (in
feet) for 100ASA, or GN=60.6 (!!?) in metric... hard  to believe in  an "old
flash unit"... unless it uses singe-use bulbs.
Sergio

>    From: Bob Wier <wier@xxxxxxxxxxxxxxxxx>
>
> I am looking at the manual for an older flash unit.
>
> It says:
>
> GN 50 ASA 25 DIN 15 in feet
>
> Am I correct in thinking this indicates a GN of 100 for
> ISO 100 speed film?




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