如题

135mm f/3.5 Zuiko (single-coated)

OM-1 with mirror lockup
Vignetting = B+
Distortion = moderate pincushion
Aperture*    Center
Corner
f/3.5 (7)    F        F
f/5.6 (11)   F+       F+
f/8 (16)     C+       C
f/11 (22)    B-       C+
f/16 (32)    B        B-
f/22 (44)    C+       C+
Notes: Low contrast.

OM-4T with mirror and diaphragm prefire
Vignetting = A- @f/3.5 (7), A thereafter
Distortion = moderate pincushion
Aperture*    Center   Corner
f/3.5 (7)    A-       C+
f/5.6 (11)   A-       B-
f/8 (16)     A        B
f/11 (22)    B+       B
f/16 (32)    B        B-
f/22 (44)    B-       C+
Notes: *Effective aperture in parenthesis (). Identical lens as above
test! Used a Bogen Telephoto Lens Support for additional stability,
although it barely fits this lens/converter combo. Moderately high
contrast in center and corner at f/3.5 (7), f/5.6 (11) and f/11 (22);
high contrast in center and moderately high contrast in corner at f/16;
moderately high contrast images in center and moderate contrast in
corner at f/16 (32) and f/22 (44).