Canon EOS 1 Instructions Manual page 35

(d)
Difficult Subjects for Autofocus
have vertical sensors, focus the subject,
then recompose the picture using the
focus lock function.
3) In the case of (f), use the center focusing
point which has a horizontal sensor,
focus the subject, then recompose the
picture using the focus lock function.
4) Set the lens' focus mode switch to "M"
and manually focus the subject.
• See "4. Manual Focusing" on page 36
for manual focusing instructions.
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