Canon A1100 IS - Manual (Page 74)

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While you press and hold the shutter button halfway, the focus and exposure
are fixed. You can now recompose and shoot. This is called Focus Lock.
Focus.
● Center the subject you want in focus, and
press the shutter button halfway.
● Confirm that the AF Frame on the subject
is green.
Recompose.
● Hold the shutter button pressed halfway
and recompose the scene.
Shoot.
● Press the shutter button fully.
If you want to save battery power, you can use the viewfinder for shooting,
instead of the screen. Shooting procedures are the same as when using the
screen. The camera will automatically focus on the subject, it will not use
face detection to focus.
Turn off the screen (p. 42) .
● Press the l button to turn off the
screen.
Compose and shoot.
● Use the viewfinder to compose and shoot.
Changing the Composition with the
Focus Lock
Shooting Using the Viewfinder
The view in the viewfinder and the image taken may differ.