Canon Pro90 PowerShot Pro90IS Camera User Guide - Page 111
Press the shutter button halfway to, focus., Press the shutter button all the way to, shoot.
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Page 111 highlights
Using Other Canon Flashes • Since other flashes fire at full strength, set the shutter speed and aperture accordingly. At shutter speeds slower than 1/125 second (maximum flash synchro shutter speed) determine the appropriate aperture value setting from the flash's guide number and the distance to the subject. You are also recommended to set the white balance to the setting. 4 Press the shutter button halfway to focus. • The flash will indicate that it has finished charging when its pilot lamp shines steadily. A red will show in the LCD monitor or viewfinder if it is on. 5 Press the shutter button all the way to shoot. • The flash will not fire in , or continuous mode. • The Speedlite 380EX, 420EX or 550EX may not fire at the correct intensity if used for bounced flash photography. • The AEB mode cannot be used for flash photography. If the flash fires, only one image gets recorded. • Please note that proprietary high-voltage flashes with multi contacts or flash accessories made by other manufacturers may cause a camera malfunction. • A Canon Speedlite 480EG cannot be used with this camera because the flash will not fire when mounted. • The following functions can be used with a Speedlite 220EX, 380EX, 420EX or 550EX. - Auto Exposure (Use the ETTL mode with a 550EX) - FE Lock (Not available in mode) - Daylight Synchro - Slow Synchro - Flash Exposure Compensation (If a 550EX is used, the range figures on the flash's display panel will not display correctly. Use the camera's flash exposure compensation function instead.) - Auto Zoom (Not available with the 220EX) Using an Externally Mounted Flash (Optional) 109
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