hammerhead man
Contributor
I would kickup the flash output settings from the camera to Maximum. It could be that there is insufficient light going up the cable to trigger the flash. You said that TTL works in auto but I'm not sure if you tried TTL when the camera is in manual mode. There is a link on the Sea&Sea manufacturers sub-forum on TTL and you may want to read that. From my reading, it indicates that most cameras use a TTL flash mode so it should work with your camera. I would also post your question on the Sea&Sea manufacturers web site to see if the Sea&Sea rep can shed some light on this issue. Here is a link to that site: http://www.scubaboard.com/forums/sea-sea/.
Regards,
Bill
Regards,
Bill