Olympus 200mm f/4 Zuiko (multi-coated)

(multi-coated)

Vignetting = A
Distortion = none
All tests shot with the same lens, in 9+ condition. These multiple tests were done to determine the effects of vibration from shutter travel and the auto diaphram mechanism.

OM-2000 with mirror & auto diaphram prefire, lens supported by
Bogen Telephoto Lens Support
Aperture Center Corner
f/4      B      B-
f/5.6    B+     B
f/8      A-     B
f/11     A-     B+
f/16     B+     B+
f/22     B+     B+
f/32     B      B-
Notes: Statistically insignificant differences to the OM-4 test below, perhaps indicating little advantage to a vertical traveling shutter in the OM-2000.

OM-4 with mirror & auto diaphram prefire, lens supported by Bogen Telephoto Lens Support
Aperture Center Corner
f/4      B      B-
f/5.6    A-     B+
f/8      A-     B+
f/11     A      A-
f/16     A      A-
f/22     B+     B+
f/32     B      B-
Notes: Apparently superior results versus using an OM-1 (see below). Zuiko lenses in this weight and length class need additional support, as well as mirror and aperture prefiring, to obtain best results.

OM-1 with mirror lock up, shutter overhaul and Bogen Telephoto Lens Support
Aperture Center Corner
f/4      C      B
f/5.6    B-     B
f/8      B      B
f/11     B+     B+
f/16     B      B+
f/22     B+     B+
f/32     B+     B+
Notes: Test immediately following is with the same camera. Differences are significant at the 1/3rd grade level (slides evaluated as pairs). Differences are significant at full letter grades levels only in comparisons to the OM-4 and OM-1 with untuned shutter.

OM-1 with mirror lock up and shutter overhaul
Aperture Center Corner
f/4      D      C+
f/5.6    C-     C
f/8      C      C+
f/11     B-     B-
f/16     B-     B-
f/22     B+     B+
f/32     B      B
Notes: Vertical shake evident atf/5.6 (=1/60th sec. exposure) and f/8 (=1/30th sec. exposure). Test immediately preceeding is with the same camera. Differences are significant at the 1/3rd grade level (slides evaluated as pairs). Differences are significant at full letter grades levels only in comparisons to the OM-4 and OM-1 with untuned shutter.

OM-1 with mirror lock up and untuned shutter
Aperture Center Corner
f/4      C      C
f/5.6    D+     C-
f/8      C-     C
f/11     C      B-
f/16     C+     B-
f/22     B-     B-
f/32     B-     B-
Notes: Low mass of OM camera body probably results in camera shake for shutter speeds of 1/60 to 1/2 sec., in spite of tripod, cable release and mirror lockup precautions. Better wide open performance attributable to lack of additional vibration from the automatic diaphram.

200mm f/4 Zuiko (multi-coated) with Olympus 2X Teleconverter
OM-4T with mirror and diaphragm prefire
Vignetting = B @f/4 (8), A- @f/5.6 (11), A thereafter
Distortion = slight pincushion
Aperture*  Center Corner
f/4 (8)    B      C
f/5.6 (11) B+     B
f/8 (16)   B      B
f/11 (22)  A-     B
f/16 (32)  B      B-
f/22 (45)  B-     B-
f/32 (64)  C      C
Notes: *Effective aperture in parenthesis (). Used a Bogen Telephoto Lens Support for additional stability. A suprisingly useable combination, both performance- and handling-wise. Moderate contrast in center and moderately low contrast atf/4 (8); moderate contrast in center and corner atf/5.6 (11) and f/16 (32); moderately high contrast in center and moderate in corner atf/8 (16) and f/11 (22); moderately low contrast in center and corner at f/22 (44) and f/32 (64).