optimum aperture

[P3D Dr. George A. Themelis <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

>if a scene in its entirety is sharp at f8 or f11, than it will be
>sharper at f16 and f22 (especially objects away from the focal plane).
>Granted that the f16 or f22 are not always needed but if you have a 
>static scene with enough film speed, why not use a tripod and f22?

Smaller apertures are fine as long as they are not at the expense
of slower _hand-held_ speeds, even though some people will say that
lenses (in general) are sharper at f8 & f11 than f22 due to 
diffraction effects at smaller apertures.

George


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