OM-2 will do longer exposures as the ISO goes down. As I recall, I hit a
maximum around 19 minutes at ISO 12. 2N is limited to 3 - 3.5 minutes at
any ISO
On Mon, Jun 7, 2021 at 9:44 AM Wayne Shumaker <om3ti@xxxxxxxx> wrote:
> At 6/7/2021 02:21 AM, Wayne wrote:
> >Thanks all for your replies. I retried the experiment with a body cap (no
> >pinhole) and the shutter closed after 3 min +/- a few seconds. This
> >behaviour is consistent regardless of ISO set. I seem to recall the OM-2
> >would keep the shutter open almost indefinitely but the OM-2N would always
> >close it at approx. 4 min. I presume my OM-4Ti is off spec - who would
> have
> >thought after 20+years !
> >
> >...Wayne
> >
> >> -----Original Message-----
> >> From: olympus <olympus-
> >> bounces+wayne.harridge=structuregraphs.com@xxxxxxxxxxxxxxxxx> On
> >> Behalf Of Mike Gordon via olympus
> >> Sent: Monday, 7 June 2021 10:12 AM
> >> To: olympus@xxxxxxxxxxxxxxxxx
> >> Cc: usher99@xxxxxxx
> >> Subject: Re: [OM] Long exposures with OM-4Ti
> >>
> >> The eSIF on the OM 4 says 4 min too.
> >>
> >> https://esif.world-traveller.org/om-sif/bodygroup/om4.htm
> >>
> >> The 4Ti entry says "about 1 min" but the OM 4 says 4 min specifically.
> >It
> >> doesn't make sense to downgrade a new model.
> >>
> >> https://esif.world-traveller.org/om-sif/bodygroup/om4ti.htm
> >>
> >> I bet it is 4 min.
> >>
> >> Mike
>
> Not sure why I remember the 2 minutes, while the 4 minute probably came
> from the OM-2n. Changes to the circuits from 2n to 4t, and what I think is
> a bias or deliberate leakage current, means 2 minutes for accurate
> exposure. Note that 4 minutes is just 1 stop more than 2 minutes. It may be
> that the timeout was deliberate to solve a problem when the shutter button
> was accidentally fired while camera was the bag. An event much more likely
> to occur than someone deliberately taking a long exposure. As you say, the
> 2 would stay open almost indefinitely.
>
> WayneS
> --
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John Hermanson
Camtech Photo Services, Inc.
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