Hi, all.
A while ago I saw on the list a discussion about the (lack of) accuracy of
the OM-4's spot meter with lenses other than the 50mm... but I'm afraid the
thing is worse than expected!
I tried all my glass while metering on a white sheet of paper, evenly lit
by a relatively distant lamp, and compared the average vs. spot readouts.
The spot mode *always* indicated a slower exposure, but the offset was
related to each particular lens. Here are the results:
Sigma 14/3.5: -0.7 (I mean -2/3 EV)
Sigma 16/2.8***: -0.7
Zuiko 21/3.5: -1.3 (that's -1 1/3 EV!)
Zuiko 28/2 MC: -0.3 (only 1/3 EV, the lowest offset, shared by a lot of
lenses)
Tamron 28/2.5: -0.3...-0.7 (somewhere in between)
Zuiko 28/2.8 MC: -0.7
Zuiko 28/3.5: -1.3
Zuiko 28-48 @28: -1.7 (-1 2/3 EV... ouch!)
@35: -1
@48: -1
Tamron SP28-135: -0.7 (at all focal lengths)
Zuiko 35/2 MC*: -0.3 (my first Zuiko)
Zuiko 35/2.8*: -1
Zuiko 35-70/3.5-4.5:
@35: -1.7 (!!!)
@50: -1.3
@70: -1
Soligor 35-140: -0.7 (at all focal lengths)
Tamron SP35-210/3.5-4.2:
@35-50: -0.3
@80-210: -0.7
Zuiko 40/2 MC: -0.3
Zuiko 50/1.4*: -1 (maybe slightly less)
Zuiko 50/1.4: -1 (id.)
Zuiko 50/1.4 MC: -0.7
Zuiko 50/1.4MC**:-1 (maybe slightly less)
Zuiko 50/1.8*: -0.3
Zuiko 50/1.8: -0.7
Zuiko 50/1.8 MC: -0.3
Zuiko 50/1.8miJ: -0.3
Zuiko 50/3.5 MC: -1.3 (ouch!)
Zuiko 55/1.2: -1
Vivitar 55/2.8: -0.7
Tamron SP70-210/3.5:
@70-135: -0.7
@210: -0.3 (mostly used at this focal length)
CPC 75-200/4.5: -0.7 (at all focal lengths)
Zuiko 85/2*: -0.3
Vivitar 85-205/3.8:
@85-135: -0.7
@150-205: -0.3
Tamron SP90/2.5: -0.3 (another of my oldest lenses)
Zuiko 135/2.8MC: -0.3
Zuiko 135/3.5: -0.7
Tamron SP180/2.5:-0.3
Zuiko 200/4 MC: -0.7 (IIRC -- forgot to write it!)
Zuiko 300/4.5: -0.7
*) Silvernose
**) Serial number 1136xxx
***) Full-frame fisheye, maybe not valid for this test.
I repeated some tests on my OM-2S -- same results (both cameras with fresh
357s). Also did a few tests in daylight -- again same results. BTW, most
lenses were set around f/4 and measured exposure (in average) was about
1/30 for ASA 400 -- well within the measuring range.
Maybe some of you can reproduce similar results... or it's just my OM-4
(CLA'd summer 2000) gone MAD??? ;-)
Enjoy,
...
Carlos J. Santisteban
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