...get used to it.........
_________________________________
John Hermanson www.zuiko.com
Camtech, Olympus Sales & Service since 1977
21 South Lane, Huntington NY 11743-4714
631-424-2121 For Free Olympus manuals,
please call 1-800-221-3000
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----- Original Message -----
From: "Carlos J. Santisteban Salinas" <cjss@xxxxxxxxxxxxx>
To: "Lista de correo Olympus" <olympus@xxxxxxxxxxxxxxx>
Sent: Wednesday, February 12, 2003 5:10 PM
Subject: [OM] Spot-metering madness
> 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
>
> <cjss@xxxxxxxxxxxxx>
> <http://cjss.galeon.com>
>
>
>
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