Jim,
A quick check on the SB-600 shows in manual mode the choices are :-
1/1 full power, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64 with - 1/3 power increments for each of those from 1/2 to 1/32.
So the Sigma has a choice of two manual settings, and the SB-600 a total of 17 settings.
Don
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