Canon EOS Rebel T2i EOS REBEL T2i / EOS 550D Instruction Manual - Page 63

Z: Changing the ISO SpeedN About "AUTO" for Automatic ISO Speed If the ISO speed is set to "AUTO", the actual ISO speed to be set will be displayed when you press the shutter button halfway. As indicated below, the ISO speed will be set automatically to suit the shooting mode. Shooting Mode 1/7/3/4/5/6/C d/s/f/a/8 2 With flash ISO Speed Setting Automatically set within ISO 100 - 3200 Automatically set within ISO 100 - 6400*1 Fixed at ISO 100 Fixed at ISO 400*2*3 *1: Depending on the maximum ISO speed that has been set. *2: If fill flash results in overexposure, ISO 100 or a higher ISO will be set. *3: In the modes and Basic Zone modes , ISO 400 - 1600 will be set automatically if bounce flash is used with an external Speedlite. If the maximum ISO speed has been set to [400] or [800], the ISO speed will be set within this range. When "AUTO" is set, the ISO speed will be displayed in whole-stop increments of 100, 200, 400, 800, 1600, or 3200. However, the actual ISO speed may be set more precisely. Therefore, in the image's shooting information, you may find an ISO speed like 125 or 640 displayed as the ISO speed. 3 Setting the Maximum ISO Speed for Auto ISON For Auto ISO, you can set the maximum ISO speed within ISO 400 6400. Under the [y] tab, select [ISO Auto], then press . Select the ISO speed, then press . 63