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The SB-900 is set to replace my SB-600. SB-600 will be used as a remote wireless flash.
SB-900 is much larger in size, but has alot more features:
Better Interface, Better Zoom range (up to 200mm), Faster recycling, Better AF assist, Wider Swivel, Thermal cut off, etc…
SB-600 on the left, SB-900 on the right
Back LCD of SB-900