Chip Louie wrote:
> You know after reading this thread for a while, I'm wondering how Canon
> picked .035mm as the standard of acceptable focus. . . .
>
> Or maybe the .035mm CoC value that Canon picked was arrived at some other
> way other than as the optimum value for apparent focus for 35mm film. Maybe
> they considered the lenses in the EOS line at the time DEP was introduced
> and film speeds in use at the time or maybe they just think 35mm more
> closely approximates "normal" for 35mm film and that this was an acceptable
> value. . . .
Pure speculation here, but perhaps it was a trade-off to allow greater DOF (in
terms of DEP anyway) at hand-holdable shutter speeds in less than optimal
lighting situations.
fcc
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