Search Results
Results for "why does my film camera light meter read wrong with hearing aid batteries"
1 article found
Photography
🇬🇧
Why a 1.45V Hearing Aid Battery Makes Your Film Meter Read Two Stops Off
Zinc-air hearing aid cells sit at 1.45V open-circuit but sag to about 1.2V under a CdS meter's load, so a mercury-calibrated meter reads 1.5 to 2 stops off.