Canon EOS 70D Operation Manual - Page 367

3 Custom Function SettingsN C.Fn I -6 Safety shift 0: Disable 1: Shutter speed/Aperture This takes effect in the shutter-priority AE (s) and aperture-priority AE (f) modes. If the subject brightness changes and the standard exposure cannot be obtained within the autoexposure range, the camera will automatically change the manually-selected setting to obtain a standard exposure. 2: ISO speed This works in the Program AE (d), shutter-priority AE (s), and aperturepriority AE (f) modes. If the subject brightness changes and the standard exposure cannot be obtained within the autoexposure range, the camera will automatically change the manually set ISO speed to obtain a standard exposure. Under [z3: ISO speed settings], even if [ISO speed range] or [Min. shutter spd.] is changed from the default setting, safety shift will override it if a standard exposure cannot be obtained. The minimum and maximum ISO speeds of the safety shift using the ISO speed will be determined by the [Auto ISO range] setting (p.124). However, if the manually set ISO speed exceeds the [Auto ISO range], the safety shift will take effect up to the manually set ISO speed. If [Shutter speed/Aperture] or [ISO speed] is set, safety shift will take effect if necessary even when flash is used. 367