As I remember the TLA280 instruction booklet says that it doesn't work correctly with the Contax 139. Unfortunately I no longer have this flash so I can't check. The TLA30 does work well with the 139 and would probably be a better choice.
GETTING THE MOST OUT OF YOUR OLYMPUS E-3
Angel Nicholson turns her attention towards the Olympus E-3, the company's flagship Four Thirds camera, and looks at how to maximise its photographic potential