The MT-24EX is the most flexible and versatile macro flash unit available in any SLR system. The twin adjustable flash heads can be arranged in countless configurations for unprecedented creative options and lighting control in macro photography. The MT-24EX supports E-TTL or TTL auto flash plus manual flash exposure control on all EOS cameras, including the new Canon ESO-1D digital SLR. The Macro Twin Lite is also compatible with Canon's exclusive E-TTL wireless auto flash system.
Supported Exposure Control: FP Flash, TTL, E-TTL Required Battery: 4 x battery - AA type Sophisticated control includes Wireless E-TTL and Ratio Control w/ EOS-1v, ELAN 7 Series, Rebel T2, Ti, K2, EOS-1Ds / D Series, 5D Mark II, 5D, 50D, 40D, 30D, 20D, 10D, D60, D30, Rebel T1i, Rebel XSi, Rebel XS, Digital Rebel XTi, Digital Rebel XT, Digital Rebel.