on 7/29/01 6:14 PM, Garth Wood at garth@xxxxxxxxxxxxxxx wrote:
> At 07:26 PM 7/29/2001 -0500, Mike W. wrote:
>> Scott,
>>
>> Perhaps I missed something (or misunderstood some previous postings).
>> Aren't both the alkalines and silver oxide batteries 1.5 volts? I thought
>> that K&S adjusted the meter to work with 1.5 volt batteries period. I know
>> that he does return the camera with alkaline after a CLA, but won't just
>> swapping for 357 solve the discharge curve problem?
>
>
> Mike:
>
> To the best of my knowledge, there is no such thing as a 357-chemistry battery
> with the form factor of a PX625 (the original mercury battery taken by the
> OM-1[n]). There *are* alkalines with the same form factor, however. If all
> that the mod is doing is changing the electrical characteristics without
> modifying the battery well's physical dimensions, then you're stuck using a
> battery with the same form factor as the original PX625 (which basically means
> PX625A's, that is, alkaline chemistry). On the other hand, if the battery
> well's physical dimensions are also modified, then you can use a "silver 76"
> type battery without problems (and the alkalines that have the form factor of
> a PX625 won't fit -- though ones with the form factor of a "silver 76" *will*
> fit).
>
> If the physical characteristics are also modified (as they should be, by any
> one of several methods), then feel free to use an alkaline instead of a
> "silver 76," but you'll get metering errors. But both you and Tom are right
> -- if the camera's been returned with a physical mod, just throw the alkaline
> away and get a 357 or other "silver 76"-type battery.
>
> I just use the MR-9 adapter, which accepts an SR44 or equivalent into a
> PX625-shaped body that contains a surface-mount component which adjusts the
> supply voltage. Slick little system.
>
> Garth
>
I've seen it suggested that the 357 battery is about as thick as the 625A
(alkaline replacement for 625 mercury cell) but is smaller diameter. The
suggestion was to find an o-ring that stretched around the 357 and had the
same outer diameter as the 625. This would keep the 357 centered in the
battery well; if the camera circuitry has been modified for the voltage then
you are set to go with that. I don't know what the correct size of o-ring is
but maybe I'll do some research and find out. O-rings typically cost ~$0.02
or less if you buy any quantity. You could probably get a couple as samples
from any seal/o-ring distributor.
--
Jim Brokaw
OM-1's, -2's, -4's, (no -3's yet) and no OM-oney...
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