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The problem is that repeat mode uses a lower power setting to allow a rapid rate ( I think you can actually set how much power to use). If you need a rapid repeat an power and portability, I think you're looking at a studio system with a batter pack. Depending on other factors (camera, ambient light etc) You might be able to raise the ISO to allow less flash to be required for the shot. (Can you lengthen the shutter speed to allow more of the ambient in?)
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