Quote Originally Posted by Michael R 1974 View Post
Is it not reading the illuminance (intensity) of reflected light and then using Exposure = Illuminance x Time?

Edit: I feel like I'm missing something here...
As Ben said, some of us can get unnecessary too technical but if you feel like you're missing something then yes you do. While it's simple Exposure=Illumninance x Time but the meter reads the luminance( and not Illuminance) of reflected light and thus there is a relatively complex process to arrive at what will be the Illuminance at the film plane.