Description:
Twin-head macro flash unit, for directional lighting in close-up photography with full E-TTL automatic flash control.
Each head can be rotated around lens in an 80° arc, swiveled inward or outward over a 90° arc, and swiveled up and down over a 90° arc.
Each head is removable, and has both a standard shoe-mount and 1/4-20 female tripod socket at the base to facilitate mounting off-camera.
Powerful guide number (72 ft/22m) allows smaller apertures and greater depth-of-field when necessary.

Full E-TTL automatic flash control with compatible EOS bodies
E-TTL features include FE Lock, FP (high-speed) sync, ratio control of A:B flash heads over a six-stop range, and Wireless E-TTL control of off-camera 550EX and/or 420EX Slave Units.
Incandescent focusing lamps, and two different types of 1-second modeling flash allow easy focusing and previewing of lighting effects.
Mounts directly onto Canon EF Macro lenses: EF 50mm f/2.5 Compact Macro, EF 100mm f/2.8 Macro, EF 100mm f/2.8 USM Macro, and MP-E 65mm f/2.8 1 5x Macrophoto.
Attaches with accessory ring Macro Lite Adapter 72C to EF 180mm f/3.5L Macro.