Canon 970 IS - Manual (Page 101)

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You can set the exposure and focus separately. This is effective when
the contrast is too strong between the subject and background or when
a subject is backlit.
To Release the AE Lock:
Press the
button.
z When shooting with the focus lock or AF lock using the LCD
monitor, setting [AF Frame] to [Center]
(p. 93) makes
shooting easier since the camera focuses using the center
AF frame only.
z The AF lock is convenient because you can let go of the
shutter button to compose the image. Moreover, the AF lock
is still effective after the picture is taken, allowing you to
capture a second image with the same focus.
z AF frames do not display in movie mode.
z Try to shoot as close to the glass as possible to reduce the
chances of light reflecting back off the glass when you shoot
a subject through glass.
Locking the Exposure Setting (AE Lock)
Available Shooting Modes p. 232
1
Turn on the LCD monitor.
2
Press the button and select (flash off).
3
Aim the camera at the subject on which you
wish to lock the exposure.
4
Press and hold the shutter button halfway and
press the button.
• The icon will display.
5
Re-aim the camera to compose the shot as
desired and press the shutter button fully.