Canon CR-N300 Settings Manual page 43

[AF Speed]
Selects the autofocus adjustment speed.
[High]
Operates AF at the fastest speed. Effective for high brightness or night view. Uses the external sensor at the same time.
[Normal]
Operates more smoothly compared to [High]. Uses the external sensor at the same time.
[Low]
Stable AF operation.
[AF Response]
Selects the responsiveness of the autofocus.
The setting values are High, Normal, and Low in order of the shortest time until the focus operation starts.
[Focus Limit]
Reduces the time to achieve the focus by limiting the focus range.
When set to [On], the focus range is limited to 60 cm (2 ft.) to  (throughout the entire zoom range). When set to off, the
range is 1 cm (0.39 in.; at full wide-angle) to , including the macro area.

Clicking on the Screen
By clicking on the person or on the subject in the screen, even if the subject moves, it is possible to continue to focus
on as the main subject. This is called tracking.
When [Face Detection AF] is [Off]
The subject in the center of the screen stays in focus and the AF frame will not be displayed.
When [Face Detection AF] is [Face Det. & Tracking]
When clicking on a person's face, a tracking frame appears on the face, and the tracking will be in progress.
Tracking Frame
If something other than the face of a person is clicked, the tracking frame appears on the subject clicked in the
screen and is tracked.
Note
When the tracking frame is displayed, the face frame will not be displayed.
When [Face Only] is selected for [Face Detection AF]
Clicking a person's face is the same as in [Face Det. & Tracking] in the previous section.
If something other than a person's face is clicked, the focus does not change.

Autofocus
• The focus position for autofocus varies slightly depending on the shooting conditions such as the subject,
brightness, and zoom position. Check the focus again before shooting.
• Focus adjustment can take a while when the frame frequency is 29.97 Hz, 25.00 Hz, or 23.98 Hz.
• It may be difficult to focus with autofocus in certain cases.
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