For most images, contrast etc. usually make a bigger impact on how sharp
the final image looks, I agree. It's just that for a pet project of
mine,
I need massive resolving power at around 1:2, even at the expense of
contrast,
for Pan F has high contrast by itself :-)
The 90/2.0 Macro is *superb*, but does begin to get out of its depth
by 1:2.
At 1:5-1:10 though, I have never seen a sharper lens. I am hoping the
80/4.0 is
a fairly cheap route to achieving superb resolving power
(better than the 50/20 or 90/2.0) at around 1:2, and still wish
somebody could dig me
out some figures, MTF graph, or something... I still want to know
whether it's basically
diffraction-limited at around f/4.0 or f/5.6, or not.
On the one hand, well-made normal lenses (like the 50/1.4 [>1.1m s/n])
can be diffraction-limited
at f/5.6, on the other hand, we have the 20mm Macro lens (both
versions) which is also apparently
diffraction-limited around wide open, but I've never seen data on the
80/4.0.
On 04 Oct 2009, at 12:29 PM, Carlos J. Santisteban wrote:
> I usually don't look for the highest resolving power,
> but in the fields of contrast and apparent sharpness, this lens is
> superb --
> around 1:1, of course.
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