Here is the set-up; XTi, CyberSyncs, Vivitar 285 HV, Flash Zebra mini-plug to Vivitar PC connection. Shooting in manual mode between 1/160 and 1/200 sec.
First problem, occasional misfires. If I use the test button it fires every time but when on camera I get intermittent misfires.
Second Problem, flash fires, camera makes sound like picture is taken but the picture is black, no image. No problems in normal shooting without flash. This does not appear to be a sync issue since speeds are OK and the whole picture is blank.
The contact on the CyberSync transmitter doesn't seem to have much springiness to it so I am a little concerned there could be the issue but since some images are black even though the flash fires I am also concerned it could be a camera problem.