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Speedlite 500EX - Added Information E-TTL Autoflash System Evaluative Through The Lens (E-TTL) exposure readings are measured by three variables which are taken into account to determine optimum flash exposure. Canon's most advanced flash metering, E-TTL offers natural-looking, properly illuminated subjects and backgrounds with good balance between flash and ambient light. Wireless Transmitter Function The Speedlite 550EX includes a built-in wireless transmitter (master unit), enabling it to control other 550EX Speedlites as slave units for main, fill and background lighting. A mini-stand is included so each 550EX Speedlite can be used as a slave unit. Other features Other features include an AF-Assist Beam with 2 emitting units lined up, automatically fires in low-light and low-contrast situations to assist the camera's auto focusing system. The FEB (Focus Exposure Bracketing) feature allows you to bracket flash exposures in three consecutive frames automatically up to 3 stops in either 1/3 or 1/2-stop increments and High-Speed Sync which allows flash to be synchronized with any shutter speed. A Modelling Flash feature enables you to check flash lighting effects (flash balance, shadows, etc.) by firing at 70 Hz for 1 second before taking the actual picture. With FE Lock - the flash version of the AE Lock - flash exposure is calculated and stored to obtain desired flash exposure. A stroboscopic flash is available with an extremely high frequency of 199 Hz for a greater percentage of successful shots. And there is a built-in Wide Panel for flash coverage up to 17mm. Choice of Power Sources Internal choices include four AA alkaline batteries, four AA NiCd batteries or four AA lithium batteries. For external power supply options, users can choose either the Compact Battery Pack E, CP-E2 or Transistor Pack E.