The macrotwin lite mt 24ex canon flash incorporates e ttl flash technology to give properly balanced exposure even under difficult lighting situations when used in conjunction with speedlite 580ex and exii units wireless control of up to three slave groups can be achievedthe control unit has a large easy to read lcd panel adopting the familiar layout of other speedlite models the ef 180mm f35l macro usm lens requires macro lite adaptor 72c and the ef 100mm f28l macro is usm lens require