Russ
Well-known
Rangefinders with bridge Circuits.
I have read on numerous occasions, that quite a few of the older rangefinders have circuits that automatically compensate for voltage difference with batteries. Is this true? If so, are they listed somewhere?
Russ
I have read on numerous occasions, that quite a few of the older rangefinders have circuits that automatically compensate for voltage difference with batteries. Is this true? If so, are they listed somewhere?
Russ
Dez
Bodger Extraordinaire
I have not heard of one. For sure the Leica M5 and CL and Canon 7 do not have this design. Typically a meter with a bridge circuit will have the user centre a needle against a fixed index. I believe LED meters generally use this design.
Cheers,
Dez
Cheers,
Dez
seany65
Well-known
My Ricoh 500GX seems to be one. I've got a silver-oxide 1.35v in and it seems to be working as it would with a mercury 1.55v.
ptpdprinter
Veteran
The mercury batteries are 1.35v and the silver oxide are 1.5v.
Beemermark
Veteran
And thus the reason his meter work's with the never silver-oxide.
seany65
Well-known
Thanks for the correction ptpdprinter.Mind you a battery with a different voltage to the original can still work in it and produce readings that are 'correct' without altering the film speed, so I think it does have a bridge circuit.
Although I could be wrong.
ChrisPlatt
Thread Killer
I don't know of any 35mm compact RF cameras with bridge circuits.
The vast majority of popular models were designed to use 1.35V
mercury cells, and won't meter correctly with modern batteries.
Users now can recalibrate meter, use adapters or adjust film speed setting.
A few mostly later models were designed to use 1.5V cells.
Chris
The vast majority of popular models were designed to use 1.35V
mercury cells, and won't meter correctly with modern batteries.
Users now can recalibrate meter, use adapters or adjust film speed setting.
A few mostly later models were designed to use 1.5V cells.
Chris
monopix
Cam repairer
