Here are a number of new tests done on Zuiko lenses and on the Olympus
IS-3. This includes tests of second samples of some lenses already
done, but most importantly, some lenses that haven't been done!
Note that I have a new ISP and my e-mail address is changing to:
pcacala@xxxxxxxxxxxxx
Gary Reese
Las Vegas, NV
*******************
180mm f/2 Zuiko (multi-coated)
OM-4T with mirror and diaphragm prefire
Distortion: slight pincushion
Aperture Center Corner Vignetting Contrast
f/2 B+ B B- mod. high
f/2.8 A- B+ A mod. high
f/4 A- A- B+ high
f/5.6 A A+ A- very high
f/8 A A A- high
f/11 A+ A- A extr. high
f/16 A- A A very high
f/22 A B+ A very high
180mm F/2 (multicoated) with Olympus 1.4x teleconverter
OM-4T with mirror and diaphragm prefire
Distortion: slight pincushion
Aperture Center Corner Vignetting Contrast
f/2 (2.8) C B+ A- high
f/2.8 (4) A+ A- A very high
f/4 (5.6) A+ A- A very high
f/5.6 (8) A- B+ A high
f/8 (11) A B+ A high
f/11 (16) A A A very high
f/16 (22) A A- A very high
f/22 (32) A A- A very high
180mm f/2 Zuiko (multi-coated) with Olympus 2x teleconverter
OM-4T with mirror and diaphragm prefire
Distortion: pincushion
Aperture Center Corner Vignetting Contrast
f/2 (4) C C B very low
f/2.8 (5.6) B+ C+ A high
f/4 (8) A- B A very high
f/5.6 (11) B- C+ A moderate
f/8 (16) B B- A moder. low
f/11 (22) B B- A moder. low
f/16 (32) B- B- A moder. low
f/45 C+ C+ A moderate
90mm f/2 Zuiko (multi-coated) with 1.7x teleconverter for IS/3
OM-4T with mirror and diaphragm prefire
Distortion: pronounced pincushion
Aperture* Center Corner Vignetting Contrast
f/2 B- C- B moderate
f/2.8 B C- B moderate
f/4 B C+ A- mod. high
f/5.6 B B- A- moderate
f/8 B B- A- moderate
f/11 B B A- mod. low
f/16 B B A- mod. low
f/22 B B- A- mod. low
Notes: *aperture on primary lens.
21mm f/2 Zuiko (multicoated)
OM-4T with mirror and diaphragm prefire
Distortion: waveform
Aperture Center Corner Vignetting Contrast
f/2 B+ C D mod. high
f/2.8 B+ C+ C mod. high
f/4 A- B+ B very high
f/5.6 A- A- B extr. high
f/8 A B+ A- very high
f/11 A- B+ A- very high
f/16 A- B+ A- very high
Olympus IS-3
at 35mm
Distortion:
Aperture Center Corner Vignetting Contrast
f/4.5 B+ C+ C+ mod. high
f/5.6 B C+ B high
f/8 B+ B A- high
f/11 B+ B A- high
f/16 B B+ A- high
f/22 B B+ A- high
at 100mm
Distortion: pronounced pincushion
Aperture Center Corner Vignetting Contrast
f/5.6 B- B- B mod. high
f/8 B B A- mod. high
f/11 B+ B+ A- mod. high
f/16 B B A- mod. high
f/22 B- B A- mod. high
at 180mm
Distortion: pronounced pincushion
Aperture Center Corner Vignetting Contrast
f/5.6 C+ B- B very high
f/8 B B A- very high
f/11 B+ B+ A very high
f/16 B+ B+ A very high
f/22 B- B A very high
at 180mm plus Olympus 1.7x teleconverter
Distortion: pronounced pincushion
Aperture* Center Corner Vignetting Contrast
f/5.6 C+ C- C moderate
f/8 B- C+ B very high
f/11 B- B- B+ very high
f/16 B C+ B+ mod. high
f/22 B- C+ A- mod. high
Notes: *approximate aperture
35mm F/2 Zuiko (multi-coated)
OM-4T with mirror and diaphragm prefire
Distortion: NA
Aperture Center Corner Vignetting Contrast
f/2 C B- B- moderate
f/2.8 C+ B- B moderate
f/4 B+ B+ A- high
f/5.6 A A- A very high
f/8 A A- A high
f/11 A A- A mod. high
f/16 A- A- A mod. high
100-200mm f/5 S Zuiko
OM-4T with mirror and diaphragm prefire
at 150
Distortion: None
Aperture Center Corner Vignetting Contrast
f/5 A- B+ A- high
f/8 A- B+ A- high
f/11 B B A high
f/16 B B A moder. high
f/22 B+ B A mod. high
f/32 B B A mod. high
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