I tested the 100-200mm f/5 S Zuiko with and without the Olympus 2X
teleconverter. As a result, there are a lot of grades here. This lens is a
real stovepipe that gets worse (excessively long) with the 2X attached. For
being in an overall compact lens lineup, this is very non-Zuiko'ish. For
definitive testing (read: use) it requires a lens clamping arm on a tripod.
It is too bad that it wasn't designed to accept the tripod mount collar, which
it needs.
***
100-200mm f/5 S Zuiko (multi-coated)
@100mm setting
Vignetting = B
Distortion = None
Aperture Center Corner
5 C+ B-
8 B+ B
11 A- B
16 B+ B
22 B- B-
32 B- C+
Notes: low contrast.
@150mm setting
Vignetting = None
Distortion = pincushion
Aperture Center Corner
5 B- B-
8 B B-
11 B B-
16 B+ B-
22 B C+
32 C+ C-
Notes: moderately low contrast.
@200mm setting
Vignetting = B
Distortion = slight pincushion
Aperture Center Corner
5 D D+
8 D+ C-
11 B- C+
16 C* C+
22 B B-
32 B- C
Notes: * = possible effects of internal camera body vibration at 1/2 sec.
shutter speed.
100-200mm f/5 S Zuiko (multi-coated) with Olympus 2X Converter
@100mm setting (effective 200mm)[not tested - illogical setting]
@150mm setting (effective 300mm)
Vignetting = A-
Distortion = slight waveform
Aperture Center Corner
5 (10) F+ F+
8 (16) D D
11 (22) D+ D+
16 (32) C C
22 (44) C C
32 (64) D+ D+
@200mm setting (effective 400mm)
Vignetting = A-
Distortion = slight pincushion
Aperture Center Corner
5 (10) C+ C+
8 (16) B- C+
11 (22) B C+
16 (32) B- C+
22 (44) C D
32 (64) D- D-
Notes: very unstable and ungainly combination. Nearly impossible to focus even
with a Varimagnifinder and a 1-8 screen. I used a second tripod to support
the front of the lens, which probably accounts for superior SQF values over
the 200mm setting without 2X Converter. The 1/8th to 4 sec. exposures may
have caused harmonic vibrations within the OM-1 body, despite mirror lockup, a
heavy tripod and use of a cable release.
Gary Reese
Las Vegas, NV
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