(Extracted from an article in UK photo magazine "Practical Photography"; the
issue is not known, but was probably sometime during 1990. The article
reviewed the OM4Ti plus 3 lenses.)
A creditable performance from this standard lens. Optimum aperture is f8,
closely followed by f5.6. Performance is consistently good at all
apertures, although f1.8 and f2.8 are slightly weaker than the rest of the
aperture range.
MTF % values for centre and edge (edge in parenthesis)
(the spatial frequency measured was not specified):
f1.8: 40% (24%)
f2.8: 59% (38%)
f4: 68% (55%)
f5.6: 75% (62%)
f8: 79% (69%)
f11: 71% (65%)
f16: 58% (52%)
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