In a John Shaw book, he says a 90mm lens has the same DOF whether it is
mounted on a 35mm, 6*6 or a 5 *4. I'm so confused.
Foxy
----- Original Message ----- > >I read somewhere that since the digital
cameras use shorter lenses (starting
> >around 6mm, I think), their depth of field is MUCH greater.
> ...
> >Can anyone comment on the depth of field differences between digital and
film?
>
> There's no free lunch. The focal length is shorter because the
> imaging area is smaller, which results in proportionately larger
> "circles of confusion," and the fractions cancel out, and you get the
> same depth of field for a given exposure.
>
> Often these lenses give greater depth of field because they have a
> tiny aperture, NOT because of their tiny focal length.
>
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