flavio81
Member
The other issue with older mechanical cameras with meters is that the meter often depends upon mercury oxide battery with its constant 1.35v output. So you need to either use Wein air cell batteries, or use some type of adapter to convert the 1.5v silver oxide down to the needed 1.35v
Or, easier, fit a #675 hearing aid cell, which is really cheap and gives the exact, stable voltage. It requires you to figure out how to make it stay in place, but this is easy on most cameras.