An alternative expanation, based on what you describe, is that the aperture
mechanism on the Tamron (or the mount) is stuck, stopped down. Take the
lens off the camera, set it to f/32 (or whatever is the minimum). Look
through the lens - it should be at full aperture - and push down the Depth
of field preview lever (opposite the lens mount lock button) - you should
see the aperture close, then open as you release the lever.
It's strange, because only one lens seems to be implicated, yet the OM4 OTF
metering should be able to cope with what it actually 'sees' on the film.
You haven't got a neutral density filter on the Tamron by any chance??
Piers
-----Original Message-----
From: owner-olympus@xxxxxxxxxxxxxxx [mailto:owner-olympus@xxxxxxxxxxxxxxx]
On Behalf Of jason.gidden@xxxxxxxxxxxxxx
Sent: 18 June 2003 08:53
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] OM4 Auto Metering problem?
Hi Chris,
Yes the shots were over exposed by several stops. Piers suggested that it
may be that the aperture linkage is adrift. I'll check that out as soon as
I finish the film that's in it at the weekend.
However I decided to conduct a small experiment last night comparing
readings from different lenses to see if that 'shed any light on the
problem' (sorry, awful pun ;-)). The problem has been mainly when I have
been using my Tamron 135mm f2.8 lens (I know I'm inviting a lot of "serves
you right for using 3rd party lenses" etc). I took a reading (all wide open
BTW) from a light source using a 50mm 1.4 Zuiko (about 1/500 sec) and then
compared the reading from the same light source using the Tamron. The
resulting reading was 1/8 sec, quite a difference!! Subsequent readings
from a couple of other lenses concurred with the 1/500 sec measurement. Now
the view to the naked eye is considerably darker when using the Tamron, even
wide open, but that's a bigger difference than might be expected is it
not???
Now I'm even more confused.
Jason.
>Hi Jason, and welcome to the List. Is the camera overexposing on the
>shots that you wrote about?
>Chris
>On Monday, Jun 16, 2003, at 14:39 Europe/London,
>jason.gidden@xxxxxxxxxxxxxx wrote:
> Good Afternoon, (or Good morning to those joining us from across the
> pond)
>
> I have a question for the assembled wise ones regarding my OM4 along
> similar lines to the current thread on the OM-2(n) AUTO metering
> problem.
>
> When using the Auto mode I often get resulting exposure times in
> excess of 10 seconds in what I would call very bright conditions.
> Similarly I tried
> to shoot a sunset recently and got exposure lengths of well over 30
> seconds, the results being 2 or 3 stops overexposed. Even accounting
> for
> the aperture being stopped right down and including polarisers, ISO 100
> film etc. these times still seem a little excessive.
>
> Most of the time the "Auto" mode performs admirably and in general I'm
> very pleased with the camera. It just seems a bit odd.
>
> Do you think I have a problem with the meter or am I just being
> stupid? I am very much a newbie to photography (and this list) so
> feel free to point
> out my lack of understanding and naiveté.
>
> Thanks.
>
<|_:-)_|>
C M I Barker
Cambridgeshire, Great Britain.
?
+44 (0)7092 251126
ftog at threeshoes.co.uk
http://www.threeshoes.co.uk
http://homepage.mac.com/zuiko
... a nascent photo library.
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