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Re: [OM] Fast Wide Angles

Subject: Re: [OM] Fast Wide Angles
From: ClassicVW@xxxxxxx
Date: Fri, 26 Mar 1999 15:41:50 EST
In a message dated 3/26/99 3:28:32 PM EST, farrar@xxxxxxxxxxxx writes:

<< For those who just have to know:
 
 Let SN = 1 when square N is shiny, SN = 0 when not
 
 S1 is always 1
 A = S2 + 2*S3 + 4*S4
 B = S5 + 2*S6
 
 ISO = 25*2**A + (2**(1/3))*(B-1)
 
 Notice that this scheme helps with cheapo cameras.
 You can detect the multiples of 25 by sensing three squares.
 100, 200, 400, and 800 by sensing 2 (S2 & S4).
 And for real cheapos, decide between 100 and 400 by sensing only S4.
 
 Paul
  >>
Paul,   
        I assume this explains how to do exposure compensation for DX only 
cameras?
        Maybe I'm thick headed, but I don't follow what the above means. Could 
you
        possibly explain it more? Maybe type it a little slower !  :)

Thanks
George S.

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