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The SD-8A shortens flash recycling time by as much as 60-70% and more than doubles the flash capacity. The SD-8A operates on six AA-type lithium or NiCad batteries and can be used with the SB-28, SB-28DX, and SB-27 Speedlights. For use with all Nikon flashes with corresponding attachment (SK-6A). Connection: with cord SC-16. Charging time: 3 sec. (alkaline); 2 sec. (NiCd). Flash output: 250 (alkaline); 100 (NiCd). Power Source
