Canon I7 사용자 설명서

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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. Set the [AiAF] 
function to [Off] beforehand 
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 AF frame.
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.