Canon 850 IS - Manual (Page 49)

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- The camera may mistakenly identify non-human subjects
as a face. If this occurs, switch to the [On] or [Off] option.
- When a face is not detected, images will be shot using
the [On] option.
In [Face Detect] mode, faces may not be detected under
the following circumstances.
- If the faces appear small, large, dark or bright relative to
the overall composition.
- If the subjects are looking sideways or lying down, or
their faces are partially obscured.
It may be difficult to focus on the following types of subjects.
Subjects with extremely low contrast to the surroundings
Scenes with a mixture of near and far subjects.
Subjects with extremely bright objects at the center of the composition
Subjects that are moving quickly
Subjects through glass: Try to shoot as close to the glass as
possible to reduce the chances of light reflecting back off the glass.
Shooting with the Focus Lock
The focus lock can be used in any shooting mode.
Shooting Hard-to-Focus Subjects
(Focus Lock, AF Lock)
Shooting Mode
1
Aim the camera so that an object at the
same focal distance as the main subject is
centered in the viewfinder or in the AF
frame displayed on the LCD monitor.
2
Press the shutter button halfway to set the
focus.
3 Keep the button pressed, re-aim the camera
to compose the shot as desired and press
the shutter button fully.