Oct 21, 2013, 09:33
EV, Exposure Value, appeared in the 60's, most cameras then had no exposure meter built in, external meters appeared with an EV dial. The cameras that had EV, had a locking device, keeping the Shutter Speed/Aperture together. Unlocked the coupler to set the EV number indicated on the meter scale, then, AP/SP setting was easy. Also was on cameras with built in meters. Never really caught on as it should, it was a great idea, but a lot of users never grasped it's potential. Still have several cameras that used this. Ed