Yesterday I had my first portrait shoot in a studio. I already had pre-imagined my lighting setup: a single softbox flash on the right for the general exposure and a big reflector on the left to soften and brighten up the depths.
During the shoot, however, my liveview preview was almost pitch black, which is understandable when I was using 1/60s, f/2.2 and iso 50 in a dimly lit studio. The only light source for the autofocus was a light through the softbox which was turned on when the flash wasn't firing.
Below is an example of what I saw in the liveivew (left) and the actual image I took (right):
Thankfully my Sony A7 III did an amazing job keeping track of the model's eye to focus on. It seemed like it brightened up the liveview every time I took a picture with prefocus on. Most of the time, I could work the composition with the little time I had when the liveview exposure was increased during AF. All planned pictures of poses exceeded my expectations so everything turned out fine.
I think I should improve my workflow in this studio situation and realized I don't know enough of studio flash usage with my camera.
How can I preview the flash exposure and simultaneously use AF in liveview?