[EMAIL PROTECTED] wrote:

Hi all, 
this is a bit OT, but still is about canon...
I've an old canonet GIII QL 17. 
It uses the mercury-based 625 battery 1.3v that are no more produced.
Some sites, i.e.:

http://www.photoethnography.com/ClassicCameras/index-frameset.html?Canon
CanonetGIIIQL17.html~mainFrame

report that "the  Canon engineers [..] made the circuitry voltage 
compensating"

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Best thing to do it try the Alkaline version of the PX625 and check the
metering against another one of your cameras.
While it may accept the voltage, many cameras that used mercury cells
used the battery's ability of having a flat output of 1.35v in the meter
operation.  What this means is that many older cameras that require
mercury 1.35v batteries, may have different meter readings if you
substitute 1.55v alkalines since they vary from about 1.62v when new to
about 1.35v when almost exhausted. If there is a silver-oxide battery in
this size use that instead. It is less variable in output voltage.

Peter K

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