6. ApplicationsEven with a wireless multi - flash system, you can use high - speed sync(FP flash), FE lock, and flash exposure compensation in the same waya s with a camera - attached 650EX.Wireless high - speed sync (FPflash) -Wireless F E lockAfter setting t h e wireless single - After setting t h e wireless single-or multi - flash setup, just s e t t h e o r multi - flash s e t u p , j u s t p r e s sST-E2's high - speed sync button to t h e c a m e r a ' s < FEL > b u t t o n t o< 5~ >. This enables wireless high - enable wireless FE lock.speed sync. T h e slaves need notbe touched at all.\ I /39: The ST-E2 can transmit wireless signals only toward the front. Therefore,the slaves cannot be positioned behind the camera. Otherwise, they willnot be able to pick up the ST-E2's wireless control signals. However, withOff - Camera Shoe Cord 2 (sold separately), the ST-E2 can be positionedaway from the camera and face any direction for wireless transmission.Flash exposure compensationFlash exposure compensationcan be set with the camera.Wlrelchs manual flashWireless manual flash can be firedby settlng the slave to single-slave -or manual flashWlreless repeating flashWireless r e p e a t i n g flash c a n beused when the slave has been set toslngle-slave or repeat~ngflashFor d e t a l l s , s e e t h e 5.50EXtsInstruct~onsCOPY