Adjusting exposure

[Mike Wright]

I believe you need to adjust the Asa/Iso number to take account of the different voltage of modern batteries. Is that correct?

[Dominique De Bast]

Hello Mike. It would help if you could specify which camera you intend to use.

[Joseph Banfield]

I believe that is true as I recall that in some of the older 35mm SLR cameras modern batteries would not give a proper light meter reading. If I recall correctly there was a specific value of resistor that was soldered in series with the battery to drop the voltage to 1.3 in order for the light meter to read accurately.

[Maurice Leakey]

Mike
You may find the following article of interest.
In essence, the newer small cells have a slightly higher voltage output than the earlier used mercury cells. As you say, it means adjusting the ASA/ISO setting to compensate.
https://www.smallbattery.company.org.uk/sbc_px625.htm


Maurice