Canon 850 IS - Manual (Page 51)

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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.
In mode, AE lock can also be set/canceled (p. 42) .
You can use the FE lock (p. 50) when using the flash.
Locking the Exposure Setting
(AE Lock)
Shooting Mode
You must set the flash to .
The AE lock cannot be used when the flash is set to fire.
1
Turn on the LCD monitor.
2
Focus on the part of the subject on which
you wish to lock the exposure setting.
3 Press the shutter button halfway and press
the button.
The icon will display.
4
Re-aim the camera to compose the shot as
desired and press the shutter button fully.