Canon EOS Rebel T5i 18-55mm IS STM Lens Kit - Manual (Page 43)

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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 the
automatic exposure system that sets the
shutter speed and aperture.
The exposure setting (shutter speed and
aperture) is displayed in the viewfinder
(0).
Pressing completely
This releases the shutter and takes the
picture.
Preventing Camera Shake
Hand-held camera movement during the moment of exposure is called
camera shake. It can cause blurred pictures. To prevent camera shake,
note the following:
• Hold and steady the camera as shown on the preceding page.
• Press the shutter button halfway to autofocus, then slowly press the
shutter button completely.
Shutter Button
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 menu display, image playback, or image recording, you can
instantly go back to shooting-ready by pressing the shutter button
halfway.
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