Feb 6, 2016, 11:32
(Feb 6, 2016, 11:09)GrahamS Wrote: Measures = based on? Huh?
If you set a light meter set to incident illumination mode in a sunny illuminated scene the rule says at F16 the shutter will be 1/ASA. Of course, this is just approximate but owing to the lattitude of film a certain amount of over or under misexposure is tolerable. To the extent that a digital sensor has exposure lattitude the F16 rule may fail or be tolerable. I actually put my old Sekonic out when this thread started to see if incident confirmed the rule. It did but not precisely.