Hi Luis:
> > There is some rounding involved, esp. f/8 which is really f/7.7
>
> This is not correct. As you can see from the messages sent by Cristopher
> Biggs and Frank van Lindert, the value for f/8 is not rounded at all, it is
> exacly 8, or, in other words, 2^3.
> In fact, only every second f-stop value is rounded (1.4, 2.8, 5.6, 11,
> ...). The other numbers are the exact value (1, 2, 4, 8, 16, ...) ie. 2^0,
> 2^1, 2^2,...
>
> Best regards from Luis
That wouldn't be the first time my Focal Encyclopedia of Photography was
wrong. In the end we got more answers than probably anyone wanted. I'm glad
my Sekonic meters in 1/10ths of a stop.
Gary Reese
Las Vegas, NV
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