Nikon D750 DSLR Camera (Body Only) - Manual (Page 167)

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Exposure
Choose how the camera sets exposure in P , S , A , and M modes (in
other modes, the camera selects the metering method
automatically).
Metering
(P, S, A, and M Modes Only)
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 (
0 429), distance information (3D color matrix metering
III; with other CPU lenses, camera uses color matrix metering III,
which does not include 3D distance information).
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 b5,
Center-weighted area ,
0 335; if non-CPU lens is attached, area is equivalent to circle
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.
h
Highlight-weighted : Camera assigns greatest weight to highlights.
Use to reduce loss of detail in highlights, for example when
photographing spotlit performers on a stage.