Canon EOS 20D Instruction Manual page 27

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If you press the shutter button halfway and (0) elapse, you must press it
halfway again and wait a moment before pressing it completely to take a
picture. 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.
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No matter what state the camera is in (image playback, menu operation,
image recording, etc.), you can return to shooting instantly just by
pressing the shutter button halfway (except during direct printing).
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Camera movement during the moment of exposure is called camera shake.
Camera shake can cause blurred pictures. To prevent camera shake, note
the advice below. Also see "Holding the Camera" (p.38).
• Hold the camera steady.
• Put your finger tip on the shutter button, hold the camera with your right
hand, then press the shutter button gently.
Operating the <6> Dial
The <6> dial is mainly used for shooting-related settings.
(1) After pressing a button, turn the
<6> dial.
When you press a button, its function
remains active for 6 seconds (9). During
this time, you can turn the <6> dial to set
the desired setting. When the timer runs
out or if you press the shutter button down
halfway, the camera will be ready to shoot.
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In this way, you can set the AF mode,
drive mode, and metering mode and
select or set the AF point.
(2) Turn the <6> dial only.
While looking at the LCD panel or
viewfinder, turn the <6> dial to set the
desired setting.
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In this way, you can set the shutter
speed, aperture, etc.
Basic Operation
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