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I have a D7000 with 3 SB900's. I have a friend who shoots with a D700 and never uses flash. She mainly shoots sports. She was just offered a job with a local new paper to shoot sports but also other areas of interest where flash may be necessary. I met with her last night to loan her a speedlight and give her a quick tutorial on how to use it.
For some reason, when she tried to take a shot with her D700, it would make the flash fire 3 times very rapildy and then it appeared to lock her shutter open and take a second or two to complete the shot. I thought it may be the flash so I swapped her with the one on my D7000 that was working perfectly and it did the same thing again on her camera but worked fine on mine.
We compared how the cameras were set up in the flash menu and they look identical. I checked to see is she was in mirror up mode and she was not. Both cameras and flash units were set in ttl. I am not a pro and I can not figure out why this would be happening. Has anyone experienced anything like this or know why it would be happening? I even took the flash off her camera and set up a couple speed lights using pocket wizzard mini and flex system. When we tried this, it fired the speedlights when she pressed her trigger. They fired once but again seemed to lock her shutter open for much longer than it should have been. She was set at f/1.8 (nikon 85mm f1.8 lens) 1/160th and auto iso.
Thanks for your input,