Canon EOS 30D EOS 30D Instruction Manual - Page 55

g Setting the ISO SpeedN The ISO speed is a numeric indication of the sensitivity to light. A higher ISO speed number indicates a higher sensitivity to light. Therefore, a high ISO speed is suited for low light and moving subjects. However, the image may look more coarse with noise, etc. On the other hand, a low ISO speed is not suited for low light or action shots, but the image will look cleaner. The camera can be set between ISO 100 and 1600 in 1/3-stop increments. ISO Speed in the Basic Zone Modes The ISO speed is set automatically within ISO 100-400. ISO Speed in the Creative Zone Modes ISO 100-1600 can be set in 1/3-stop increments. With C.Fn-08 [ISO expansion] set to [1: On] (p.170), "H" (ISO 3200) can also be set. 1 Press the button. (9) X The current ISO speed will be displayed on the LCD panel. In a Basic Zone mode, "Auto" will be displayed on the LCD panel. 2 Setting the ISO Speed. While looking at the LCD panel or viewfinder, turn the dial. At higher ISO speeds and higher ambient temperatures, the image will have more noise. High temperatures, high ISO speeds, or long exposures may cause irregular colors in the image. 55