I'm searching for an external battery pack compatible with the Sigma EF-610 Super flash mounted on my Nikon D7000 so I can reduce recycle times doing bird photography. Do any UHH's have experience using the Quantum QB1 battery pack with this flash and/or any other external battery pack with the Sigma EF-610? (I believe it's compatible with but may not be identical too the Nikon SB600 flash.)
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