V1.02
Thom Hogan’s Complete Guide to the Nikon D300
Page 528
Custom Setting #A4 Set Focus Lock-On Parameters
(Focus tracking with lock-on)
Nikon bodies have long had a feature called Focus Lock-on.
This function tells the focus system to ignore a sudden and
temporary
large
change in focus. Such changes happen, for
example, if someone runs in front of your subject. Sports
photographers sometimes don’t always want the camera to
refocus in such situations, so Nikon added the ability to tune
this ability:
Long
Change has to occur for a long time to trigger
AF shift
Normal
Nikon’s default pause before shifting AF
[default]
Short
AF shifts even on short changes
Off
Focus Lock-On is
de
activated
Recommendations:
1. This is an action-specific setting; for some sports and
activities you’ll want Lock-On active, while with others
you won’t. If you’ve been getting photos where the action
in the background is in focus but something that is
happening near is out of focus, this new setting may be
the solution (though check to make sure it isn’t simply a
sensor selection issue first).
2. Note that
Off
is the equivalent to “infinitely short.”
Essentially, Nikon has given you four timing settings:
