I am slightly confused how I operate the FL600r in manual which you need to do off camera. As far as I can tell I choose to operate its flash power between 36 and 3.2 - 36 being full power. Now I would imagine that if I wanted the flash to operate at half power I would reduce the output by half - so 36/2 = 18. That would reduce the light one stop. The problem is, if I reduce the flash output from 36 to 18 my flash meter essentially tells me I have reduced the output by 2 stops (almost). Hence my confusion - can someone explain. PS is there any way to set the flash so that it shows 1/2, 1/4, 1/8 etc power.