It's that simple with all of our lights, with some caveats. For this to work correctly, you must be metering ONLY the flash you are adjusting. This means no other flashes firing via slave, and no competing high ambient light.
If you increase power, make sure the light recycles properly.
If you decrease power, make sure the power dumps, either by waiting, or by pressing the left joystick to test fire (this actually requires a couple of fires with Einstein).
Failure to ensure the light has settled on its new power can result in erroneous readings. Also, a change in angle or distance can influence meter readings, especially at close distances.
Also, there may be a .1f fluctuation in the reading, especially across a large power change. So, if you go from f/8.0'0 to 4.0'0, you could get an f/2.8'9 reading. Those not familiar with 1/10 stop meter readings may confuse this with a larger variation than .1f.
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