Re: f/32 testing

[T3D Greg Erker <erker@xxxxxxxxxxxxxx>]

>Considering that Ansel Adams was a member of the f/64 club, I suspect
>that sharp crisp photos are possible.  For some reason, it seems yours
>are not.  I certainly not going to challenge John B.'s reccomendations.

  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. If this
is acceptably sharp then you can use f/45 on a 100 mm lens
and f/90 on a 200 mm lens and still get acceptable results.

  In large format cameras the lens focal length tends to
be longer so larger f-numbers are acceptable.

Regards - Greg E.


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