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[OM] Re: Long exposure capability of OM2n

Subject: [OM] Re: Long exposure capability of OM2n
From: "John Hermanson" <omtech@xxxxxxxxx>
Date: Tue, 18 May 2004 10:13:20 -0400
Good luck!
----------------------------------------------------
John Hermanson  www.zuiko.com
mail:  omtech@xxxxxxxxx
Camtech Photo Services, Inc.
21 South Lane, Huntington NY 11743-4714
          631-424-2121
------------------------------------------------
----- Original Message ----- 
From: "Dado dela Cruz" <dado@xxxxxxxxxxxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Tuesday, May 18, 2004 10:02 AM
Subject: [OM] Re: Long exposure capability of OM2n


>
> Hi John,
>
> I followed your instructions, placed the body cap, taped a cover to the
> eyepiece, set the camera on Auto and released the shutter.
>
> Sad news - The shutter time is only about 5 seconds.
>
> I ran a roll of B & W film to test the exposures in Auto mode.  Normal
> shooting (with shutter speed of 1/4 and faster) appears in order. Only the
> ones with
> long exposures of 1 to 5 seconds ( with the use of tripod) resulted to
thin
> negatives.
>
> For sure there is a defect in the camera. This is what I want to discover.
> Much as I like to send it to you but I'm in a far away place
(Philippines).
> Shipping cost alone is quite prohibitive.   Please give me some tips on
> where to look as I dissect the camera. I have 3 OM-1 and 1 OM-1n which I
> have successfully CLA'd. I have a little knowledge in electronics which I
> learned while working on audio amplifier kits. I downloaded and read Mark
> Dapoz'  OM2 repair manual.
>
> I hope I can be successful  especially when you give me some pointers in
> locating the trouble.
>
> Thanks in advance.
>
> Dado
>
> ----- Original Message -----
> From: "John Hermanson" <omtech@xxxxxxxxx>
> To: <olympus@xxxxxxxxxx>
> Sent: Tuesday, May 18, 2004 8:27 PM
> Subject: [OM] Re: Long exposure capability of OM2n
>
>
> >
> > Low light test does not need a lens.  All you need is body cap and
> eyepiece
> > taped over.  You need total darkness to see haw far the camera is
capable
> of
> > going.  A lens and an LED just confuses the matter.
> > ----------------------------------------------------
> > John Hermanson  www.zuiko.com
> > mail:  omtech@xxxxxxxxx
> > Camtech Photo Services, Inc.
> > 21 South Lane, Huntington NY 11743-4714
> >           631-424-2121
> > ------------------------------------------------
> > ----- Original Message -----
> > From: "Dado dela Cruz" <dado@xxxxxxxxxxxxxxxxxxxxxxxx>
> > To: <olympus@xxxxxxxxxx>
> > Sent: Monday, May 17, 2004 7:55 PM
> > Subject: [OM] Re: Long exposure capability of OM2n
> >
> >
> > >
> > > 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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> > >
> > >
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