Canon EOS 1D - Manual (Page 41)

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Basic Operation
The shutter button has two steps. You can press the shutter button
halfway. Then you can further press the shutter button completely.
Pressing halfway
This activates autofocusing and
automatic exposure metering that sets
the shutter speed and aperture.
The exposure setting (shutter speed and
aperture) is displayed on the top LCD
panel and in the viewfinder (9).
Pressing completely
This releases the shutter and takes the
picture.
Preventing Camera Shake
Camera movement during the moment of exposure is called camera
shake. Camera shake can cause blurred pictures. To prevent camera
shake, note the following:
• Hold and steady the camera as shown on the previous page.
• Press the shutter button halfway to autofocus, then press the
shutter button completely.
Shutter Button
Pressing the <p> button will be the same as pressing the shutter
button halfway.
If you press the shutter button completely without pressing it halfway first
or if you press the shutter button halfway and then press it completely
immediately, the camera will take a moment before it takes the picture.
Even during the menu display, image playback, and image recording,
you can instantly go back to shooting-ready by pressing the shutter
button halfway.
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