They're saying that the 1.5V (probably 1.59v with no load) will cause
exposure errors compared to the proper voltage of 1.35V. So, you're
supposed to set the asa lower to fool the meter into causing overexposure.
As I recall, the meter error is 2-3 stops. Maybe someone else can offer
more info. I haven't purposely tested a camera with a 1.5v (probably 1.59
v) in a long time, no need too, we all know here that it is wrong.
It would be like using a alkaline 625U (if it were stable).
_________________________________
John Hermanson www.zuiko.com
Camtech, Olympus Sales & Service since 1977
21 South Lane, Huntington NY 11743-4714
631-424-2121 For Free Olympus manuals,
please call 1-800-221-3000
_________________________________
----- Original Message -----
From: "Bill Stanke" <bstanke@xxxxxxxxxxxx>
To: "Olympus Users Group" <olympus@xxxxxxxxxxxxxxx>
Sent: Wednesday, May 07, 2003 1:07 PM
Subject: [OM] Mercury battery replacements
Hi Zuiks:
I read in the June 2003 issue of Shutterbug that Excell Battery USA is now
offering silver batteries that will replace the PX-625 mercury cell. Their
website is:
http://www.exellbattery.com
The replacement cell in question has a nominal voltage of 1.5 volts, instead
of the 1.35 volts of the mercury cell. I asked them about this, and here is
their reply:
"Thanks for your inquiry.
The higher voltage of the Silver Batteries is not a factor if you are using
print (negative ) film. Photo processing machines have an adjustment
latitude of 1 to 1½ stops for over and under exsposure of print film.
If you are using slide film or a hand held light meter you will need to"lie"
to your device with the ASA setting or have a resistor installed toreduce
the voltage of the battery. You will need to experiment if you use
the ASA method . We have heard of adjustments from zero to a full stop
depending on the specific type of meter.
Silver Oxide behaves like Mercury in that is has a flat discharge curve, so
if the reading is off it is consistantly off and can be reliably compensated
for.
Thanks again.
Best Regards
TRIAD / Exell"
I think that John H.'s solution for the OM-1 is still the best method (i.e.,
357 battery, and a Zener diode), but I think that a lot of you are still
using Gossen meters, etc. that use the old mercury cells.
I'm planning on trying them out in my Leicaflex SL, as the CRIS MR-9 adapter
does not fit in this model, and the zinc-air cells have a short useful life.
Bill Stanke
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