Hi Fernando,
Thanks a lot for this very informative result of your experiment on OM2's
low light exposure capability. I'm very sure many readers would be
interested to know about that results.
My observation is that with MC lenses, exposures are longer, contrary to the
belief that multicoated lenses transmit more light.
But today, after so many years, does your OM2n still give this low light
capability?
Best regards,
Dado
----- Original Message -----
From: "Fernando Gonzalez Gentile" <fgnzalez@xxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Tuesday, May 18, 2004 1:30 AM
Subject: [OM] Re: Fw: Long exposure capability of OM2n
> on 17/05/2004 00:44, Dado dela Cruz at dado@xxxxxxxxxxxxxxxxxxxxxxxx
wrote:
>
> > I have an OM2n and would like to know if it's normal for the old OM2n's
to be
> > inconsistent with their long exposure capability.
>
> Hola Dado,
>
> I have some hand written notes about a comparison test I run on 1981 which
> might be of interest. Then, I had my own OM2 and a friend's 2n, both new.
I
> used a red LED as a light source on an absolutely dark room. I had two
50mm
> 1.4: mine was a G.Zuiko and my friend's a Zuiko MC #over 1000000. Fresh
> batteries on both cameras, tripod mounted and LED centered and focused on
> split image. Hope to have put a piece of undeveloped film inside, honestly
I
> don't remember. Casio chronograph start and stop on mirror up and down
> noise.
> Test measured as follows:
>
> OM2n
> ASA100 @ f2.8
> Zuiko MC G.Zuiko
> 24.3 sec. 21.9 sec.
> 24.5 sec. 22.0 sec.
> 24.4 sec. 21.6 sec.
>
> OM2
> ASA100 @ f2.8
> Zuiko MC G.Zuiko
> 27.6 sec. 25.4 sec.
> 27.6 sec. 25.2 sec.
> 27.8 sec. 24.7 sec.
>
> OM2n
> ASA400 @ f5.6
> Zuiko MC G.Zuiko
> 21.4 sec. 18.1 sec.
> 21.2 sec. 17.7 sec.
> 21.4 sec. 17.9 sec.
>
> OM2
> ASA400 @ f5.6
> Zuiko MC G.Zuiko
> 19.9 sec. 18.2 sec.
> 19.9 sec. 18.1 sec.
> 19.6 sec. 17.9 sec.
>
> Differences noticed when switching lenses led me to compare at full
> aperture:
>
> OM2n
> ASA100 @ f1.4
> Zuiko MC G.Zuiko
> 8.1 sec. 7.3 sec.
> 8.1 sec. 7.2 sec.
> 8.0 sec. 7.2 sec.
>
> OM2
> ASA100 @ f1.4
> Zuiko MC G.Zuiko
> 11.3 sec. 10.1 sec.
> 11.2 sec. 10.0 sec.
> 11.2 sec. 09.9 sec.
>
> Also have a set of measures of my own OM2/G.Zuiko showing exposure
variation
> at different ASA rating.
>
> Regards,
>
> Fernando.
>
>
>
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