This setting allows you to determine how long the EOS 40D remains active before shutting itself off. As you can see in Figure 3.19, you can select 1, 2, 4, 8, 15, or 30 minutes or Off, which leaves the camera turned on indefinitely. However, even if the camera has shut itself off, if the power switch remains in the On position, you can bring the camera back to life by pressing the shutter button or, if using a Creative Zone mode, by pressing the * button.
Saving Power with the EOS 40D
There are three settings and several techniques you can use to help ...