GigaPan EPIC Pro User Manual page 75

second in bright areas where you want to be able resolve
details.
Method One
EV distance from brightest area to average exposure
using 1/3 EV shutter settings
EV Distance from shadows to average exposure using
1/3 EV shutter settings
Set your camera shutter speed to the brightest 1/160
second meter reading and then change the shutter speed
and count how many settings it takes to reach the average