>From: Thomas Bryhn <thomas.bryhn@xxxxxxxxxx>
>
>If you play with one of the DoF calculators and compare DoF for different
>formats you'll discover that for any angle of view DoF only depends on
>absolute aperture.
AND reproduction ratio. That's where people get tripped up. A dime that is
life-sized on a 4/3 sensor will have the same DOF as a dime that is life-sized
on 8"x10" large format.
>f/0.5 is the optical limit for lenses with air on both sides, and
>that would require an infinitly large opening...
I'm not aware of any such limitation. The front element diameter approaches
infinity as the focal ratio approaches zero, but that's a long way from 0.5.
--
: Jan Steinman -- nature Transography(TM): <http://www.Bytesmiths.com>
: Bytesmiths -- artists' services: <http://www.Bytesmiths.com/Services>
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