Nikon D6, Reference Manual

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159
Choosing How the Camera Focuses (Focus)
A
3D-Tracking
When [ 3D-tracking ] is selected for AF-area mode, the camera stores the
colors in the area surrounding the focus point at the moment the shutter-
release button is pressed halfway. Consequently 3D-tracking may not
produce the desired results with subjects that are similar in color to the
background or that occupy a very small area of the frame.
A Quick Focus-Point Selection
Choosing [ 27 points ] or [ 15 points ] for Custom Setting a4 [ Focus points
used ] reduces the number of focus points available via the multi selector,
speeding focus-point selection.
A
Auto-Area AF Starting Point
Selecting [ Enable ] for Custom Setting a12 [ Auto-area AF starting point ]
lets you choose the starting focus point when AF-C is selected for AF
mode. After you focus on the subject in the selected point, the camera will
resume normal auto-area AF. This feature is recommended when your
subject’s position in the frame can be predicted with some degree of
confidence.
A
AF-S/AF-I Teleconverters
If [ 3D-tracking ] or [ Auto-area AF ] is selected for AF-area mode when an
AF-S/AF-I teleconverter is used, [ Single-point AF ] will automatically be
selected at combined apertures slower than f/5.6.