Flash power
Meter a fixed setup at 1/32, then predict and measure the reading at 1/16. Compare your prediction with the result.
Six field labs to help you predict the result before you touch the controls.
Meter a fixed setup at 1/32, then predict and measure the reading at 1/16. Compare your prediction with the result.
Measure the face and backdrop before and after moving the light. Record brightness, coverage and shadow changes.
Compare controlled before-and-after readings at the subject and background. Keep power, distance and aim fixed.
Meter each light separately at one consistent point. Then measure them together and compare the sum.
Establish ambient exposure with flash off. Add flash, change background brightness and verify the subject.
Record exact gear and repeated camera frames across offsets. Save a stable, unclipped result for that configuration.