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[OM] Lens Tests: Olympus 2X on short telephotos

Subject: [OM] Lens Tests: Olympus 2X on short telephotos
From: PCACala@xxxxxxx
Date: Thu, 21 Jan 1999 13:49:17 EST
If one is willing to stop down FOUR stops from maximum aperture, the results
of using the Olympus 2X Teleconverter approach that of the prime lens alone.
Here are the comparisons involving the 100mm f/2.8 and the 135mm f/3.5.
Again, focusing is hampered by terrible performance wide open, as well as
darkening of focusing aids in the normally used screens.
***
100mm f/2.8 Zuiko (single-coated) ***no converter***
Vignetting = A
Distortion = None
Aperture  Center    Corner
f/2.8     D-        D-
f/4       C         C
f/5.6     B-        B-
f/8       B         B
f/11      B         B
f/16      B+        B+
f/22      B+        B+

100mm f/2.8 Zuiko (single-coated) with Olympus 2X Teleconverter
Vignetting = B+
Distortion = slight pincushion
Aperture     Center    Corner
f/2.8 (5.6)  F+        D-
f/4 (8)      D         D
f/5.6 (11)   C-        C
f/8 (16)     B         B-
f/11 (22)    B+        B
f/16 (32)    B         B-
f/22 (44)    B-        B-
Notes: soft at small apertures.

135mm f/3.5 Zuiko (multi-coated)  ***no converter***
Vignetting = A-
Distortion = slight pincushion
Aperture  Center    Corner
f/3.5     C+        C
f/5.6     C         C
f/8       B-        B-
f/11      B         B
f/16      B+        B+
f/22      B+        B
Notes: contrasty, but moderately low resolution

135mm f/3.5 Zuiko (multi-coated) with Olympus 2X Converter
Vignetting = B+
Distortion = moderate pincushion
Aperture  Center    Corner
f/3.5     F         F
f/5.6     F+        F+
f/8       C+        C
f/11      B-        C+
f/16      B         B-
f/22      C+        C+
Notes: soft in contrast.

Gary Reese
Las Vegas, NV

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