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In both, I'm referring to filming with a Panasonic GH5 on V-Log L 1. Why do we need correct exposure for a particular log? Do colors shift when using wrong IRE? Or is it more for retaining details, not colors? 2. I've seen someone on Youtube (can't remember exactly who) saying that to get proper exposure on V-logL, your subject should be at 42 IRE. Using an 18% gray card, he adjusted the exposure until it's roughly 42 IRE. So i thought to myself that I can adjust exposure even when the subject/actor hasn't arrived on the set yet. I'll hold an 18% gray card on where his face would be and put it at 42 IRE on my waveform (or false color monitor). However, I've read somewhere that IRE is different for different skin tones, like 55 for caucasians. So, should I just expose my grey card to 42 IRE of just wait for the actor to arrive and expose for his skin tone? Which one is correct? Thanks advance! God bless.