Olympus FL 50R Instruction Manual page 29

Second curtain synchronization
A slow shutter is used and the flash is emitted immediately before the
end of the exposure period.
This makes it possible to take pictures of moving objects such as car
taillights with a streaming effect.
Combination with camera's built-in flash
When the camera in use has a built-in flash, it can be used
simultaneously with the electronic flash.
For example, you can bounce the light from the electronic flash off
the wall or ceiling while using the camera's built-in flash for a catch-
light effect. Advanced shooting techniques are possible.
With certain camera models, the built-in flash may be disabled when
the electronic flash is attached to the camera's hot shoe.
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Notes
The electronic flash control mode should be set to TTL AUTO or FP TTL
AUTO.
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