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Forum: Film SLRs and Compact Film Cameras
11-02-2009, 01:00 AM
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Aye, the Spotties are remarkably prescient in that respect.
Most of the mercury-celled cameras use the voltage from the batteries as the baseline voltage for the meter, and if the battery was of a different voltage to the one it was designed for, then your metering would be off. Spotties had buffer circuitry in there, I think. A bit more complex, but a bit more robust, future-proof, and you don't have to worry about the battery's output curves, either - which is in fact one of the advantages of those mercury batteries.
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