Skip Williams wrote:
>An f/2.0 lens produces the same depth of field, regardless of the sensor or
>film size,
>
>If you mount a 90/2 Zuiko Macro on an E-1, it functions at the equivilant
>magnification of a 180mm lens, but still retains all the depth-of-field,
>perspective, and working distance characteristics of a 90mm lens.
>
Not DOF, unless...
>You could get the same result by cropping a 4/3-sized rectangle out of a piece
>of 35mm film.
>
>
Exactly! However, to get the same size print or other display size, the
image has to be enlarged about twice as much, which changes the DOF.
Remember, DOF is inherently subjective and, no matter what it looks
like, DOF tables have always been calculated back from the acceptable
fuzziness to the human eye at a given display size. So if one is happy
with a half size print, DOF is the same, otherwise, it is less.
Moose
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