Hello Doug:
<< The f/32 may be of little practical importance. As a rule, this is too
small
for best sharpness with a 90mm lens. The point is reached where loss of
sharpness from the small aperture is worse than loss from DOF. >>
f/32 will not be theoretically diffraction limited at infinity through 1:2.5
reproduction. It will at 1:2, 1:1, etc. However, small aperatures are less
sharp and I suppose that Vivitar had a higher standard than Tokina in this
matter.
Gary Reese
Las Vegas, NV
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