. Thank you for purchasing a Canon product.Speedlite Transmitter ST - E2 is a wireless transmit -t e r which can control up to two Speedlite 550EXgroups set as slaves.The transmitting range is about 12 to 15 meters /39.4 to 49.2 ft indoors and 8 to 10 meters / 26.2 to32.8 ft outdoors. With Type A cameras (EOS - 3, EOSElan IIIIIE, EOS 50/50E, EOS 500NlRebel G, EOSIX. EOS IX7AX Lite), the ST - E2 can execute the fol-lowing operations through wireless control:E-?"rL autoflashHigh - speed sync (FP flash)FE lockFlash exposure compensationManual flash (Flash output set with Speedlite)Multi - flash firing (Set with the Speedlites)This Instructions booklet assume that a Type A cam - 'era is used with the ST-E2.With Type H cameras (EOS cameras except 'I'ypeA models), the ST - E2 can be used only for manualflash and multi - flash photography. See pages 23to 27 in this booklet a n d t h e Speedlite 550EXInstructions.Symbols used in this Instructions booklet:0: Warning for preventing camera or ST - E2malfunction.a: Supplementary notes for using t h e ST - E2with the camera.:'&: Helpful tip for using the ST - E2 and taking- ,A F - a s k t dea'm to a r e a k . - I IWith the EOS - 3, the following operations are alsopossible: Flash ratio control between two Speedliteslave P ~ O U D S .modeline flash firing. and linkage ofC €The C E Mark is a Directive cunformity mark of the EuropeanCommunity (EClpictures.Keep this Instructions booklet handy for futurereference. 1 .This digital apparatus does not exceed the Class Blimits for radio noise emissions frnrn digital appara -tus as set out in the interference - causing equipmentstandard entitled " Digital Apparatus " , ICES - 003 ofthe Industry Canada.COPY