comments:
ResplendentMechanism posted on r/m432w
Unless I'm misunderstanding, the short answer would be to use aperture priority mode—in the settings pick whether your front dial is the aperture and your back dial is exposure compensation or vice versa. You can spin the dials quickly when the scene calls for it. I like to control my ISO, so I set one of the top buttons to call that up, then I adjust using the dials. That should solve 98% of what I think you're asking about. The long answer is to get the kindle version of this for $6: https://www.amazon.com/Olympus-Mark-Menu-System-Simplified-ebook/dp/B0852RP9VT/ref=tmm_kin_swatch_0 David Thorpe was very good at explaining this stuff clearly and thoroughly, and the E-M5 iii guide was one of the last guides that he published.