The big selling feature by Olympus was that this particular strobe is supposed to sync to the camera's internal flash. It doesn't have a lot of switches: only TTY and M on one switch and 1/2 and full on another.
Olympus - UFL-1
So in short, I don't have either a fiber optic cable or a sync cord (assuming they are not one and the same thing). Maybe I'm missing a needed piece of equipment?
The UFL-1 is an entry level strobe. It's low powered, so only good for close ups. Here is what Olympus says:
"This underwater slave flash requires no cables and enables divers to capture stunning images even in the darkest waters. The UFL-01 is incredibly compact and light weight. It has been designed and specially customized for use with Olympus Digital cameras and Underwater Housings. Waterproof to 40 meters, this underwater flash is one of only a few that allow TTL underwater flash photography in slave mode - ideal for multiple flash applications and single flash macro shots. "
I like the C5050 and I have used it a lot with an external flash. It will still work very well today for taking great pics underwater, witness that there are many people still using it. But you have to get the settings right. These settings are a starting point that works with your UFL-1 strobe.
With your C5050, you have to:
SET the
camera in Manual exposure mode so it does not pre-flash; use F4 and 1/100 exposure for starting.
SET the
camera flash mode to "int + ext (picture of a flash) and SLOW1
SET the UFL-1 flash to TTL.
Why?
The flash can't handle the rapid pre-flash of the C5050, so don't use pre-flash (the only mode that does not preflash is M).
INT+EXT insures that your internal strobe will fire, but tells the camera there is an external flash.
SLOW1 is first curtain sync, you want this.
Lastly, the UFL-1 needs to be in TTL mode so it will time its own flash to match the camera's flash. The flash does not come with a fiber optic cable and you don't need one, it has a sensor that triggers when your camera flash goes off.
If you still have problems, post some pics of what you get, and the camera and flash settings. Something is not set quite right. If you want to get a better flash, I suggest the INON S2000, it's much better and quite compact also. Still you will have to set the camera right to get good pictures, but the INON will probably be less forgiving. In particular, it can handle preflash, so you can use the P, A, and S modes which allow easier shooting or more creativity.
For more advanced info, definitely read:
Splashdown Divers - Boynton Beach, Florida - Underwater Digital Photography - 5050 Settings - 5060 Settings