Canon Speedlite 90EX Instruction Manual - Page 12
Aperture Priority AE, Manual Exposure
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W: Aperture Priority AE In this mode, the camera will automatically adjust the flash output level to achieve standard exposure for the set aperture. If the background is dark, like a night scene, a slow sync speed will be used to obtain a standard exposure of both the main subject and background. Standard exposure of the main subject is obtained with the flash, while a standard exposure of the background is obtained with a slow shutter speed. • Since a slow shutter speed will be used for low-light scenes, using a tripod is recommended. • If the shutter speed display blinks, it means that the background exposure will be underexposed or overexposed. Adjust the aperture until the shutter speed display stops blinking. q: Manual Exposure Select this mode if you want to set both the shutter speed and aperture manually. As the camera will automatically adjust the flash output level according to the aperture you set, the exposure of the main subject will be standard. The exposure of the background is obtained with the shutter speed and aperture combination you set. 10