Instruction Manual
Page 107
..., 580EX, 550EX, 430EX II, 430EX, 420EX, 320EX, 270EX II - Using an external power source other than Canon may result in flash. * Macro Ring Lite MR-14EX / + Macro Twin Lite MT-24EX Flash for optical transmission wireless control of Speedlites set as slave units. ( Speedlite Transmitter ST-E2 Transmitter for macro photography. , Speedlite with excellent portability. 600EX-RT/600EX...
..., 580EX, 550EX, 430EX II, 430EX, 420EX, 320EX, 270EX II - Using an external power source other than Canon may result in flash. * Macro Ring Lite MR-14EX / + Macro Twin Lite MT-24EX Flash for optical transmission wireless control of Speedlites set as slave units. ( Speedlite Transmitter ST-E2 Transmitter for macro photography. , Speedlite with excellent portability. 600EX-RT/600EX...