Canon Speedlite 270EX SPEEDLITE 270EX Instruction Manual - Page 11

Flash Shooting in Each Camera Mode X: Shutter Priority AE In this mode, the camera will automatically adjust the flash output level to achieve standard exposure for the automatically set aperture. • If the aperture display blinks, it means that the background exposure will be underexposed or overexposed. Adjust the shutter speed until the aperture display stops blinking. 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. 9