NEED HELP-CAMERA DOESN'T WORK-SETTINGS FOR C5050 WITH YS-90 in Photography Gear and Technique Posted January 16, 2005 I have a C5050 Olympus w/dual YS-90 strobes and dual sync cord. My settings with the YS-90 are set to TTL and Slave "on" buy iy does not fire the strobes. My current settings are: Flash mode slow-flash intensity (-2)-auto focus AF set to "flower"-flash is at "slave". My question is are these settings correct for underwater close up and why doesn't the stobes work or fire? To fire the stobes, should the camera be set to "slave"? What does the "ROC" button do? WHAT AM I DOING WRONG-I need help now since we're on a dive trip in Curacao and the camera is new to me? Any and all help appreciated.