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[OM] Re: OM-1 age & s/n, batteries/check and battery mod

Subject: [OM] Re: OM-1 age & s/n, batteries/check and battery mod
From: "John Hermanson" <omtech@xxxxxxxxx>
Date: Mon, 17 May 2004 11:28:57 -0400
I recently lowered my price on the MR9 to  $29.95 + $6 shipping, total is $1
less than Cris.
----------------------------------------------------
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: "Ross Orr" <voxbongo@xxxxxxxxxxxxx>
To: "Michael Kopp" <mkopp@xxxxxxxxxx>
Cc: <olympus@xxxxxxxxxx>
Sent: Sunday, May 16, 2004 10:42 PM
Subject: [OM] Re: OM-1 age & s/n, batteries/check and battery mod


> Hi Michael,
>
> About your questions 3 & 4 . . .there's quite an exhaustive
> discussion in this PDF,
>
> http://olympus.dementia.org/Hardware/PDFs/batt-adapt-US.pdf
>
> The short version is that yes, for proper metering a stock OM-1 needs
> a battery supplying 1.35 volts with a *flat voltage curve* over its
> lifetime.
>
> If you fit a silver oxide battery (~1.6v) into the compartment, the
> metering will be quite badly off--but probably not by a constant
> amount that you could correct by changing the E.I.
>
> A good Olympus service shop can internally re-adjust the meter to
> work correctly with 1.5v batteries. But that's going to be expensive
> if you have no other reason to overhaul the camera.
>
> The solution of finding a battery adapter is probably the best one.
> These use a Schottky diode to drop the voltage of a 1.6v button cell
> to 1.35 volts. You will want to use a silver oxide cell, because
> alkalines have a sloping voltage curve. This seems to be the
> best-known brand,
> http://www.criscam.com/mr9.htm
>
> but does anyone know of a cheaper alternative?
>
> >was the OM-1 actually designed electronically around
> >some specific characteristics of that type/voltage of mercury
> >batteries, and what might those have been, that prevents any other
> >battery from working right. Was it a current factor?
>
> cheers,
>
>   -- Ross
>



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