Nikon D3000 - Manual (Page 92)

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Exposure
Metering
Choose how the camera sets exposure in P, S, A, and M modes (in other modes, the
camera selects the metering method automatically).
1
Place the cursor in the information display.
If shooting information is not displayed in the monitor, press the R button.
Press the P button to place the cursor in the information display.
2
Display metering options.
Highlight the current metering method in the
information display and press
J.
3
Choose a metering method.
Highlight one of the following options and press
J.
R button Information display P button
Method Description
L Matrix
Produces natural results in most situations. Camera uses 420-pixel RGB
sensor to meter a wide area of the frame and set exposure according to
tone distribution, color, composition, and, with type G or D lenses
(
0 158), range information (3D color matrix metering II; with other CPU
lenses, camera uses color matrix metering II, which does not include 3D
range information).
M
Center-
weighted
Camera meters entire frame but assigns greatest weight to center area.
Classic meter for portraits; recommended when using filters with an
exposure factor (filter factor) over 1×.
N Spot
Camera meters current focus point; use to meter off-center subjects (if
e Auto-area is selected for AF-area mode as described on page 44,
camera will meter center focus point). Ensures that subject will be
correctly exposed, even when background is much brighter or darker.