I have a copy of a Modern Photography test from June 1987 of the OM4T and
Zuiko 50/1.4 S/N 1140088 (so of the latest formulation).
The lens is described thusly:
Field Test Slides: Transparencies crisp an snappy overall, fine detail well
rendered. Center-to-corner sharpness consistent throughout aperture range.
Slightly soft images, slight falloff in illumination in corners wide open,
both improving noticeably by f/2. Overall, somewhat above average
performance for high speed normal lens.
Optical bench report: On axis, very slight over corrected spherical
aberration, very slight red flare, gone by f/5.6; diffraction limit was
reached by f/5.6. Off axis, slight skew-ray flare mixed with very slight
astigmatism, both virtually gone by f/5.6. A minimal amount of lateral color
present throughout.
Resolution
at 1/49
f Center (l/mm) Corner(l/mm)
1.4 VG 55 Exc 49
2 VG 62 Exc 55
2.8 G 62 VG 55
4 VG 69 Exc 69
5.6 VG 69 Exc 62
8 VG 69 Exc 62
11 VG 62 Exc 55
16 VG 62 Exc 55
Exc=Excellent
VG=Very Good
G=Good
The contrast tests at 30 lines/mm were medium to high, with the best
aperture being f/5.6 where contrast was high in center and corner (59 & 48
respectively).
The Nikkor AF 50mm f/1.4 tested in the same issue scored slightly better
overall than the Zuiko.
Chip Stratton
cstrat@xxxxxxxxx
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