
To modify the ISO settings on your Canon 40D 10.1MP Digital SLR, follow these steps: First, power on your camera and locate the "Menu" button on the back. Next, use the arrow keys, positioned on the top right of the camera's rear, to navigate the menu. Scroll through the options until you find "ISO speed settings", and then press the "Set" button (located centrally within the arrow keys). This action displays a list of available ISO speeds. Use the arrow keys to select your desired ISO speed. Confirm your selection by pressing the "Set" button once more. Finally, press the "Menu" button again to exit the menu. Remember that the Canon 40D supports ISO speeds ranging from 100 to 1600. Furthermore, you can extend this range to ISO 3200 using the ISO expansion feature. For detailed information, consult the Canon 40D 10.1MP Digital SLR Camera Instruction Manual.


