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P3D ASA values (was Notorious Fuji?)

  • From: CanterMike@xxxxxxx
  • Subject: P3D ASA values (was Notorious Fuji?)
  • Date: Tue, 3 Aug 1999 00:07:58 EDT

In digest 3432, George writes, in part:


<<  32 to 40, 40 to 50... these are 
1/6th f-stop increments >>


Actually, G, these are one-third steps.  Remember that doubling or halving 
the ASA/ANSI index changes exposure(s) by full steps. (100 is one full step 
faster than 50, 25 one full step slower than 50.)  The intermediate values 
give 1/3 step changes.  



M


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