Two thoughts Douglas:
Fist - Spot metering through a 500mm lens is giving a spot reading field of
view of less than half a degree. *If* your Sekonic can
measure such a small angle, I bet you a 90/2 Zuiko that you can't aim it as
accurately as you can your OM4. Are you sure that you
are metering the same target?
Second - Is the A2 mount properly engaging with the aperture sensing cam in the
lens throat of the OM4? If it is missing the cam,
the metering will be way off. Check by mounting the lens while you look
through from the film plane (with the shutter open on B
unless you care to cut a hole in the shutter blind :-)) Looking from the film
plane, the cam starts at about 2 o'clock with out the
lens mounted, then should get moved round to maybe 11 o'clock.
HTH
Piers
> -----Original Message-----
> From: owner-olympus@xxxxxxxxxxxxxxx
> [mailto:owner-olympus@xxxxxxxxxxxxxxx] On Behalf Of Douglas Tourtelot
> Sent: 19 November 2003 18:26
> To: olympus@xxxxxxxxxxxxxxx
> Subject: [OM] Help!
>
> I just got a Tam*on 500/8. I am having trouble with expected
> exposures on my OMs. I have not sent anything to the lab,
> but something is not right here.
>
> For example, when I spot meter with my OM4 and my Sekonic
> 508, I get vastly different readings (the OM4 reads 2-3 stops
> slower than the Sekonic). Also, with both the T-20 and the
> T-32, according to my OM2SP, I can't pump enough light at 8
> feet (ASA 100) to get the meter to read OK. It always says
> "UNDR". This is in "AUTO" with the speed set at 1/60. Now
> the T-32 at 8 feet should melt the film<g>.
>
> I believe that the A2 adapter is installed correctly (the tab
> is in the
> notch) and this lens is supposed to be a f8 (T-stop of
> 9-something, but that should not be causing all these woes).
>
> What the heck am I doing wrong?
>
> PS. What a dumb lens for Seattle in the winter<g>.
> Hand-holding at 1/2 is not so easy with a 500mm lens! And to
> think I actually bought ND2 and ND4 filters for it in case
> there was just too damned much light!!
>
>
>
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