Canon PowerShot SX20 IS PowerShot SX20 IS Camera User Guide - Page 160

Using an Externally Mounted Flash (Sold Separately) • The settings from the flash are applied to the flash mode, flash exposure compensation, flash output, shutter synchro, and wireless function when you turn on the camera. • Available functions aside from those in the table on p. 159 are as follows. - Auto Exposure (Set the camera to E-TTL mode) - FE Lock (When [Flash Mode] is [Auto]) - Auto Zoom (Not available with the 220EX or 270EX) • Please read the manuals that came with the flash and speedlite transmitter. • For continuous shooting, the flash can be used in quick flash mode (pilot lamp lit green). In this case, light emission may be less than with full flash (pilot lamp lit red) (580EX II only). • If the external flash has been set to stroboscopic flash, the flash's set up menu cannot be chosen (580EX II only). • Speedlite 380EX, 420EX, 430EX, 550EX, and 580EX can be used in the same way. Canon Flashes Other than Speedlite EX Series Since other flashes fire at full strength, refer to the guide number listed in the flash's user guide for the optimal aperture values and ISO speeds for the distance to the subject. 160