All prosumer and professional Canon cameras have a two-stepped power switch (the Rebel does not). To power the camera up, raise the toggle to either the first or second position. On prosumer EOS bodies, the first position is a general “on” switch with the Quick Control Dial disabled. The second on position will allow you to make exposure setting adjustments. Because the Quick Control Dial is so close to where you may have your thumb when shooting, it’s possible to nudge the dial inadvertently. When shooting in Program, Aperture Priority or Shutter Priority, this adjusts your exposure compensation. In Manual, this dial controls aperture. With the dial turned on, it would be possible to throw off the exposure without realizing it, so it’s a good idea to keep the power switch in the first position until you want to make adjustments (FIG 4.1).
FIG 4.1
On most EOS-1 bodies, the second power switch only powers the audible signal. On the EOS-1 bodies prior to the 1D Mark III, there is an additional switch, the Quick Control Dial Switch, located in 11 o’clock position just above and to the left of the Quick Control Dial. You may make exposure and vertical focus point adjustments only when this switch is active, however even when turned off, the Quick Control Dial will work for scrolling through the menu or moving around within an enlarged image you are reviewing (FIG 4.2).
FIG 4.2
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