-But, in reality, anything over a 3.2 is considered "critically" sharp,
-right? So perhaps you wouldn't be able to tell the difference
-between a 3.9 and a 4.2. Dunno.
The difference to a layman without a loupe will be the color balance and
contrast, both of which will affect the "apparent" sharpness when viewed at
normal viewing distances. This is only due to the fact that lenses in the
3.9 and above range are likely premium lenses as opposed to mid-grade at
3.2-3.9. Premium lenses have better sharpness over a wider range of
aperatures. But you pay premium prices too. If you shoot mid-aperatures
and like the balance/contrast of your mid-grade lense, then you will not
likely find better by simply paying more money.
Brian Fancher
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