At 03:41 PM 3/26/99 EST, you wrote:
>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.
Here's the table typed out. You need a monospaced font.
ISO 123456
25 * *
32 * *
40 * **
50 ** *
64 ** *
80 ** **
100 * * *
125 * * *
160 * * **
200 *** *
250 *** *
320 *** **
400 * **
500 * * *
640 * ***
800 ** **
etc
1600 * ***
etc
3200 *****
etc
5000 ******
The second row uses square 7 for ground, 8-10 for number of frames, and
11&12 for latitude. (I've never seen a camera use those last two.)
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