These EOS-dedicated Speedlites are available as large-output, autozoom models or compact flash units. All EX- series Speedlites feature E-TTL autoflash, high-speed sync (FP flash), and FE lock.
•Macro Ring Lite MR-14EXEOS-dedicated macro ring flash featuring twin flash tubes, Guide No. 14 (at ISO 100 in meters), and E-TTL autoflash. You can fire only one or both flash tubes and control the flash ratio to easily obtain sophisticated lighting effects with E-TTL autoflash. Also, high- speed sync (FP flash), FE lock, and a wireless, multi-Speedlite (with 550EX as a slave) system are possible to achieve various macro flash effects.
•Off-Camera Shoe Cord 2
This cord enables the 550EX to be connected off-camera up to 60 cm away. All of the Speedlite’s controls and features can be used as usual. The Cord can be used with all EX-series,EZ-series, and E-series Canon Speedlites.