Canon ML-3 Macro Speedlite

The ML-3 is a macro ring-type flash.
It is designed to clip on to the front of the lens.
It has two separate tubes which can each be switched on or off for creative control.
A control unit is placed on the camera hot shoe and is connected by a coiled cord to the flash-tube unit.
Exposure is TTL-auto only.
50mm coverage is valid when mounted on the front of a lens.