Nikon D4 User Manual - Page 149
Exposure, Metering
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VExposure Metering Metering determines how the camera sets exposure. The following options are available: Option Description 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 or D lenses (0 385), distance information (3D color matrix metering III; with L other CPU lenses, camera uses color matrix metering III, 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 (0 228); otherwise camera uses center-weighted metering. Center-weighted: Camera meters entire frame but assigns greatest weight to center area (if CPU lens is attached, size of area can be M selected using Custom Setting b5, Center-weighted area, 0 315; if non-CPU lens is attached, area is 12 mm in diameter). Classic meter for portraits; recommended when using filters with an Z exposure factor (filter factor) over 1×. * Spot: Camera meters circle 4 mm (0.16 in.) in diameter (approximately 1.5% of frame). Circle is centered on current focus N 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. * * For improved precision with non-CPU lenses, specify lens focal length and maximum aperture in Non-CPU lens data menu (0 228). 123