Quote Originally Posted by Stephen Benskin View Post
You need to think about each part on it's own. The scene luminance range and illuminance doesn't change, the exposure meter doesn't change, it's the placement of the exposure on the film curve that changes based on the speed point / exposure meter ratio.
But if it has always been f/16 and shutter = reciprocal of EI... What changed when the safety factor was removed.

Let me think a minute.

It was ASA (old standard with safety factor) 50 so f/16 at 1/50th... Now it's ISO (current standard) 100 so f/16 at 1/100th...

OK the exposure did change.