Canon PC1057 User Manual page 119

Using the Manual Focus in Combination with the
Auto Focus
Mode Dial
The camera automatically searches for a more suitable focusing
point from the current manually focused location.
1
Focus the camera with the manual focus, then press
the SET button.
The camera focuses automatically to a more accurate focusing
point near the current focusing point.
You cannot change the AF frame setting while focusing
manually. Cancel the manual focus mode, then change the AF
frame setting.
You can use manual focus in the macro focal distance (p. 73). In
this case, the fine scale is adopted.
You can change the MF indicator displayed distance units
(p. 50).
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