Re: f/32 testing

[T3D Dr. George A. Themelis <fj834@xxxxxxxxxxxxxxxxxxxxx>]

>>Considering that Ansel Adams was a member of the f/64 club, I suspect
>>that sharp crisp photos are possible.
>
>  The diffraction problem is caused by the physical size
>(diameter) of the hole not the f-number (which is a ratio).
>
>  So f/22 on a 50 mm lens is about a 2.3 mm hole.

As a side note, my personal experience with my Minolta 50/3.5 macro lens is
that at f/22 it is very sharp, possibly sharper than in wider apertures (pure
subjective evaluation by looking at the pictures, no efford was made to 
measure anything).  f/22 is the smallest aperture in this lens and I used it
to take advantage of the increased DOF in my last round of tabletops.

-- George Themelis


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