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| Re: Studio strobes wont sync w/d7000 nikon ittl |
The strobes are "dumb" units in that all they do is fire at a set power level. iTTL Speedlights can adjust power as needed based on the "intellegent Through The Lens" measurement of the reflected light from preflashes sent just before the picture is taken.
Problem? The iTTL preflashes fire the strobe before the shutter opens. The strobe(s) can be triggered by the flash from one other (radio controlled) strobe, because there's only one flash; no preflashes.
Your Nissin flash fires in sync because it's designed to be controlled by the Nikon Creative Light System (CLS), and so it "understands" the pulse language of the camera's flash and knows to fire at the right time(s).
The command-and-control and metering preflashes happen so fast that they may appear to be one and the same as the exposure flash, but they're not; you can see this buy setting a slow shutter speed and rear-curtain sync: the preflashes will happen before the shutter opens, then there will be a delay as the exposure takes place, then -- just before the second curtain closes -- the main flash pulse will go off.