When holding the camera as if to take a picture, the Shutter Button will be easy to reach with your right index finger (FIG 4.7).
The Shutter Button is a two-stepped switch. Push it halfway down and it will activate and set auto focus (AF) and auto exposure metering (AE) for every Zone except Manual. In Manual Mode, you can use the Quick Control Dial and the Main Control Dial to move shutter speed and aperture until the Exposure Level Indicator is centered or otherwise where you want it to be. If you’re using a lens with Image Stabilization, it is also activated by a half-press of the shutter button.
With prosumer EOS bodies, the Exposure Level Indicator is found on the bottom of the viewfinder; with EOS-1 bodies it’s found on the right side of the viewfinder.
After pressing the Shutter Button halfway, it will remain active for a few seconds, after which you’ll have to press it again to reactivate it.
Pressing the Shutter Button all the way will take the picture.
Should you be checking the Menu or reviewing images, you can return to shooting almost immediately just by pushing the Shutter Button to the halfway position.
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