Nikon COOLPIX P310 Reference Manual page 99

Focusing on Subject
Focus Lock
Use focus lock to focus on off<:enter subjects when center is selected for AF area
mode.
To focus on off-center subjects when AF area mode (_55) is set to Center in P,
S, A M or U mode, use focus lock as described below.
1
Position the subject at the center of the I
fra me. m
2
Pressthe shutter-release button
halfway.
•" green.SUbject is in focus and the focus area lights inExposure is alsolocked. [_
3 Continue holding down the shutter-
release button halfway and recompose the
picture.
• Besureto maintain the samedistance between the
cameraand the subject.
4 Press the shutter-release button all the way to
take the picture. I _" J
81