Modeling LampPressing the < > button illuminates the modeling lamp for 5 min. To turn it off,press the button again.This is useful for checking subject shadows created by the Speedlite.Pressing the camera shutter button completely turns off the modeling lamp.CautionAvoid looking directly at the modeling lamp at close range, which may cause visualimpairment.Shooting with the modeling lamp on from a camera in < > shooting mode maycause underexposure.When the flash does not fire, such as when the flash is disabled or when shooting amovie, the modeling lamp does not turn off automatically even if you press theshutter button fully.A warning appears when the modeling lamp becomes hot ( ).The modeling lamp may dim or turn off if the ambient temperature around itbecomes too high.NoteYou can change how the modeling lamp is activated in C.Fn-18.Brightness of the modeling lamp can be adjusted in P.Fn-06.You can select how long the modeling lamp remains on in P.Fn-07.The light is dimmer when a wide panel is used.The modeling lamp of connected sender/receiver units ( ) turns on and off inresponse to pressing the < > button when the Speedlite is a sender inradio transmission wireless flash photography.77