Quote Originally Posted by Poisson Du Jour View Post
Forget about "calibrating (TTL) meter". Your first priority is to load transparency film into the camera and shoot as the meter reads the scene: leave it all to the TTL meter to start with. .

...but never forget the phenomenon of 'subject failure'...a metering target which fails to match the assumption of average brightness of 18% gray. Even TTL meters cannot remain immune to subject brightness induced metering error!