135mm f/2.8 Zuiko (single-coated)
OM-4T with mirror and diaphragm prefire
Vignetting = B @ f/2.8, A thereafter
Distortion = slight pincushion
Aperture Center Corner
f/2.8 C+ C+
f/4 B B-
f/5.6 A- B
f/8 A- B
f/11 A B+
f/16 B+ B
f/22 B B-
Notes: Moderately low contrast images at f/2.8; moderate contrast at f/4
and f/22; moderately high contrast images at f/5.6 to f/8 and f/16; high
contrast images at f/11.
135mm f/2.8 Zuiko (multi-coated)
OM-1 with mirror lockup
Vignetting = A-
Distortion = none
Aperture Center Corner
f/2.8 B B-
f/4 B- B-
f/5.6 C+ B-
f/8 B- B
f/11 B+ B+
f/16 B+ A-
f/22 B B+
Notes: Moderately high contrast at expense of resolving power throughout
aperture range, with impressively high contrast wide open.
135mm f/2.8 Zuiko (multi-coated) with Olympus 2X Teleconverter
OM-1 with mirror lockup
Vignetting = B
Distortion = none
Aperture Center Corner
f/2.8 (5.6) F F
f/4 (8) D- F+
f/5.6 (11) D D
f/8 (16) C- D+
f/11 (22) C+ C+
f/16 (32) B- C
f/22 (44) B- B-
Notes: Moderately low contrast at f/22 and f/16 (effective f/44 and f/32),
low contrast at f/5.6, f/4, andf/2.8 (effective f/11, f/8, and f/5.6),
otherwise moderate contrast.
OM-4 with mirror and aperture prefire and Bogen Telephoto Lens Support
Vignetting = B @ f/2.8, A @ f/4
Distortion = none
Aperture Center Corner
f/2.8 (5.6) B- C
f/4 (8) B+ B
f/5.6 (11) B+ B
f/8 (16) B+ B
f/11 (22) B B-
f/16 (32) B- B-
f/22 (44) B- C
Notes: Moderately low contrast at f/22 and f/16 (effective f/44 and f/32),
high contrast at f/2.8 throughf/8 (effective f/5.6 through f/16), moderate
contrast at f/11 (effective f/22).
135mm f/3.5 Zuiko (single-coated)
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