>But what happens when you have SB-600 and SB-800/900 mix since >the power levels available for the SB-600 are different from >the SB-800/900. My guess is that the SB-600 ignores the value >for the 1/128 power level.
SB-600 in manual mode does not have 1/128. My guess is that this level cannot be reliably controlled. However when used as remote flash, it will try to do it. Even though the output amount may not be precise.