Canon EOS-1Ds Mark III EOS-1Ds Mark III Instruction Manual - Page 56
Setting the ISO Speed
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Z: Setting the ISO Speed 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 finer. The camera can be set between ISO 100 and 1600 in 1/3-stop increments. 1 Press the button. (9) X The current ISO speed will be displayed on the top LCD panel and in the viewfinder. 2 Set the ISO speed. Turn the dial to set the ISO speed. Using a high ISO speed or shooting in high-temperature conditions may result in more grainy images. High temperatures, high ISO speeds, or long exposures may cause irregular colors in the image. If C.Fn II -3 [Highlight tone priority] is set to [1: Enable], "L" (equivalent to ISO 50), ISO 100/125/160 and "H" (equivalent to ISO 3200) settings cannot be set. (p.164) With C.Fn I -3 [Set ISO speed range], the ISO speed range can be extended to ISO 50 (L) to 3200 (H). (p.158) 56