Quote Originally Posted by markbarendt View Post
The lighting on the main, the most important side of the subject, needs to match the camera setting.

That camera setting places the important parts of the subject's "zones and tones" in all the intended places.

At that point your camera and main light settings, are "etched in stone".

The measurement and adjustment of lighting on the the other side of the subject is done "after-the-fact" to control the ratio.