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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