Well, it is of course possible, that any specific sample of some lens is
not well aligned. However, in my test the A*85/f1.4 did perform quite
well at wide open, and I guess that a misalignment would show especially
at wide. To me it seems that the A*85/f1.4 is optimized for wide open
performance, for high contrast at wide open, and for infinity. Let us
not forget that the measured resolution is valid for one object
distance, only, in each measurement. Maybe in your test the distance was
bigger than in mine?
Arnold
Rob Studdert schrieb:
Your measurements and more importantly trends don't correlate at all well with
mine for the A*85/1.4 either. My 50mm tests in this same series to which I'm
referring do however align quite well with most other tests that I'm aware of.
Maybe your A*85/1.4 has an alignment problem? I have yet to do a technical
appraisal of the comparative performance of my A*85/1.4 and 77LTD however given
my experience with both lenses I don't expect to observe the differential that
you measured.
But back to the initial question the 77LTD can be used quite successfully wide
open. IMHO there is really nothing else that you can buy in PK mount that will
be as good in AF, so your choices are limited in any case
