Note the following when using a third-party flash unit mounted on the camera hot shoe:

• Using obsolete flash units that apply currents of more than about 24 V to the X-contact will damage the camera.
• Connecting flash units with signal contacts that do not conform to Olympus specifications may damage the camera.
• Set the Shooting mode to M, set the shutter speed to a value no higher than flash synchronous speed, and set ISO sensitivity to a setting other than [AUTO].
• Flash control can only be performed by manually setting the flash to the ISO sensitivity and aperture values selected with the camera. Flash brightness can be adjusted by adjusting either ISO sensitivity or aperture.
• Use a flash with an angle of illumination suited to the lens. Angle of illumination is usually expressed using 35-mm format equivalent focal lengths.