Canon 2756B001 EOS DIGITAL REBEL XSi/EOS 450D Instruction Manual - Page 57
Changing the ISO Speed
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Z: Changing the ISO SpeedN Set the ISO speed (image sensor's sensitivity to light) to suit the ambient light level. In the Basic Zone modes, the ISO speed is set automatically. 1 Press the button. (9) X [ISO speed] will appear. 2 Select the ISO speed. Turn the dial or press the key to select the ISO speed. You can also look at the ISO speed in the viewfinder while turning the dial. ISO Speed Guide ISO Speed Normal (No flash) 100/200 Sunny outdoors 400/800 1600 Overcast skies, evening Night or dark indoors Flash Range The higher the ISO speed, the farther the flash range will be. (p.58) About Auto ISO This mode sets the ISO speed automatically between ISO 100 - 800 to suit the shooting mode and ambient light level. For flash and (manual) exposures, ISO 400 is set. When you press the shutter button halfway, the automatically-set ISO speed is displayed in the viewfinder and on the LCD monitor. Using a high ISO speed or shooting in high-temperature conditions may result in more grainy images. Long exposures can also cause irregular colors in the image. Under the [7 Custom Functions (C.Fn)] menu, if [Highlight tone priority] (p.156) is set to [1: Enable], the settable ISO speed range will be ISO 200 - 1600. 57