Canon EOS-3 Instructions Manual page 49

6. Focusing an Off-Center Subject
To focus a subject not covered by the area AF ellipse, follow the
procedure below. This technique is called focus lock.
• Focus lock works only in the One-Shot AF mode. See page 35.
Evaluative metering is recommended for use with the One-Shot AF mode which
locks the autoexposure setting (AE lock) at the same time focus is achieved. The
exposure metering is linked to the focusing point.
1 Aim the focusing point on the
subject and press the shutter
button halfway to focus.
Keep pressing the shutter button
2
halfway (this locks the focus) and
recompose the picture as desired.
3 Press the shutter button completely
to take the picture.
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