Nikon Df - Manual (Page 95)

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Exposure
Metering determines how the camera sets exposure. The
following options are available:
Metering
Option Description
a
Matrix : Produces natural results in most situations. Camera meters
a wide area of the frame and set exposure according to tone
distribution, color, composition, and, with type G, E, or D lenses
(0 320), distance information (3D color matrix metering II; with
other CPU lenses, camera uses color matrix metering II, which
does not include 3D distance information). With non-CPU lenses,
camera uses color matrix metering if focal length and maximum
aperture are specified using Non-CPU lens data option in setup
menu (0 164); otherwise camera uses center-weighted
metering.
Z
Center-weighted : Camera meters entire frame but assigns greatest
weight to center area (if CPU lens is attached, size of area can be
selected using Custom Setting b1, Center-weighted area,
0 250; if non-CPU lens is attached, area is 12 mm in diameter).
Classic meter for portraits; recommended when using filters with
an exposure factor (filter factor) over 1×.
b
Spot : Camera meters circle 4 mm (0.16 in.) in diameter
(approximately 1.5% of frame). Circle is centered on current
focus point, making it possible to meter off-center subjects (if
non-CPU lens is used or if auto-area AF is in effect, camera will
meter center focus point). Ensures that subject will be correctly
exposed, even when background is much brighter or darker.