(from http://members.aol.com/olympusom/lenstests/default.htm )
Nikon Micro-Nikkor 55mm f/2.8 AIS (multicoated)
Nikon F2 with mirror and diaphragm prefire
Distortion: slight waveform with no tendencies
Vignetting: A- @ f/2.8, A thereafter
Aperture Center Corner
f/2.8 A- B+
f/4 A A-
f/5.6 A A-
f/8 A+ A+
f/11 A A-
f/16 B+ A-
f/22 B B
f/32 B- B-
Notes: High contrast at f/2.8 and f/16; very high contrast at f/8 and
f/11; extremely high contrast at f/5.6; moderately high contrast
(diffraction limited) at f/22 and f/32. Remarkable image detail at
f/8 - the optimal aperture.
50mm f/2.0 Zuiko Macro (multi-coated)
OM-1 with mirror lockup
Vignetting = B
Distortion = none
Aperture Center Corner
f/2 C C
f/2.8 C B-
f/4 B B
f/5.6 A A-
f/8 A+ A+
f/11 A A
f/16 A A-
OM-2000 with mirror and aperture prefire, same lens as above
Aperture Center Corner
f/2 B- B-
f/2.8 B- B
f/4 A- A-
f/5.6 A- A
f/8 A+ A+
f/11 A A-
f/16 A- B+
Notes: Moderate contrast at f/2, f/2.8, f/4, f/5.6, f/16, moderately high
contrast at f/8 to f/11. Paired comparison to the Leitz 50mm f/2
Summicron-M in the Other Camera Manufacturer's Lenses section, with
differences significant at the 1/3 grade level.
50mm f/3.5 Zuiko (multi-coated)
OM-1 with mirror lockup
Vignetting = B+
Distortion = none
Aperture Center Corner
f/3.5 C+ C-
f/5.6 A- B+
f/8 A- A-
f/11 A- A-
f/16 B+ B
f/22 B B-
Notes: Moderately high contrast image which softens beginning at f/11
and is distinctly softer at f/22, thus yielding best performance at
f/8; soft wide open; classic performance curve across aperture range.
OM-4 with mirror and aperture prefire
Vignetting = A- @ f/3.5, A @ f/5.6
Distortion = very slight pincushion
Aperture Center Corner
f/3.5 B- C
f/5.6 A A
f/8 A+ A
f/11 A A
f/16 A- A-
f/22 B+ B+
Notes: Moderately high contrast, except high at f/8. Different lens
sample than the OM-1 test above.
tOM
...
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