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Comments about LumiQuest LumiQuest Big Bounce, Bounce Flash Device:
The weight of the Big Bounce unit tends to make the head of my Nikon SB-600 AF speedlight flop down to the horizontal position whenever the camera, with the SB-600 and the Big Bounce attached, is tilted downward. In order to prevent this, I wrap a Lumiquest cinch strap around the area where the speedlight head joins the body. I don't know if this would happen with other speedlights, but I recommend using a cinch strap with the SB-600, as described.