I just tested my Sony a7R4 mirrorless camera with a stopwatch. It takes about 0.6s for the viewfinder to be ready. If I flick the switch while raising the camer

I just tested my Sony a7R4 mirrorless camera with a stopwatch. It takes about 0.6s for the viewfinder to be ready. If I flick the switch while raising the camera to my eye, it's up just as I look through.