I'm resending this because the first one may not have gone through.
1,38x,xxx is amongst the OM-1s made without prism foam, that's good..
Production date is approximately November of 1977. Production changed from
OM-1 to 1N around 1,63X,XXX, around January 1979.
----------------------------------------------------
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: "Michael Kopp" <mkopp@xxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Sunday, May 16, 2004 8:01 PM
Subject: [OM] OM-1 age & s/n, batteries/check and battery mod
>
> Hi, folks,
>
> Some questions bugging me for some time. Have just bought another
> OM-1 to give to my daughter who is going off to her second country
> (born a Kiwi here, she's also a Yank because I am) for the first time
> in her 21 years, so I don't have to give her one of my two.
>
> Please cc any rapid answers to me as well as list as I am on digest.
>
> 1. SN/age. Is there a list on the Web anywhere that correlates serial
> numbers with the ages/models of OM-1? This camera is an MD, with the
> MD badge on the leatherette to the right of the lens as you look at
> the front of the camera (not the apparently earlier model with the
> badge poorly stuck to the chrome on the other side, next to the
> rewind button). The serial number is seven digits, beginning with 138.
>
> 2. Batt check. Does this vintage of OM-1 MD have a battery check
> capability? I've seen John's page on earlier models that have it, but
> he doesn't give any information on HOW early the camera has to be in
> order to have a batt check.
>
> And why would not later OM-1s have had it?
>
> And, what IS the batt check procedure? I've never seen this in print,
> either, and I don't have an OM-1 manual old enough. (I've been using
> OMs since 1976.)
>
> 3. Batts. Are people actually still buying PX 625 mercury batteries
> (such as from PX625.com) and using them either in the States or
> shipping them out to other countries? PX625.com makes you swear on a
> stack of old batteries that you won't actually use them anywhere
> they're prohibited.
>
> If not, what are you folks actually using? (Yes, I know John says the
> best compromise is any 1.5 V silver oxide.)
>
> Why does it appear there are no other 1.35 V large or small button
batteries?
>
> And, in OM lore, 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?
>
> 4. Batt mods. Battery compartment modification. I can't tell (after a
> search of several years of this list and John Hermanson's site and
> googling my fingers off) if the OM-1 battery mods that are out there,
> including John's and the MR 9 adapter, have an electronic component
> to adjust the voltage of 1.5x V batteries to 1.35 V (or even if that
> is desirable).
>
> I have two other OM-1 MDs, one older (only six digit SN) and one
> younger, than the one I just bought for my daughter. About four years
> ago I made a major trip back to Vietnam after 30 years since my first
> trip, and had the OMs CLAed by a reputable local repairman. He made a
> battery compartment modification so I could use the smaller-diameter
> button battery, and I used Varta V76PX silver oxide batteries. But
> the meters never worked right, and, because I didn't take a hand-held
> meter with me to Vietnam, I shot 100 rolls of B&W and color by eye
> estimate exposure. (I'm happy to report that my ability to do this
> was still there, and most exposures were good.)
>
> If the batt mods do NOT include a voltage dropper, then do the 1.5 V
> silver oxides work properly, or should one make an exposure
> correction (via EI setting)? I have not tried any 1.5 V silver oxides
> in the "new" OM-1 yet, so I don't know if it has an exposure meter
> flaw or not.
>
> Now that's certainly enough questions. Number four is the most
> important, because I would like for the daughter (who chose the OM-1
> as the camera she wanted from an early age) to have a camera that
> works right.
>
> Thanks in advance for any reprising of any earlier discussion of this
> topic, and for bringing it all together in one place.
>
> Regards,
>
> --
> Cheers from the Antipodes,
>
> Michael Kopp
> Wellington, New Zealand
>
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