Nikon D70 manual Metering, Controlling How the Camera Sets Exposure, Center Wtd

Exposure

Controlling How the Camera Sets Exposure

Metering

In P, S, A, and M modes, the metering mode determines how the camera sets exposure. The following options are available when a CPU lens is attached (metering is not performed when a non-CPU lens is used).

Method		Description
	Metering is performed by 1,005-pixel RGB sensor, which sets exposure
	based on variety of information from all areas of frame. This method is
	particularly effective where frame is dominated by bright (white or yel-
3D color	low) or dark (black or dark green) colors, when its results approach what
	is seen by human eyes. 3D color matrix metering, which uses range infor-
matrix/	mation from lens in adjusting exposure, is available only with type G or D
Color	lenses. Color matrix metering, which does not include range information,
matrix	is available with other CPU lenses. Matrix metering will not produce
	desired results with autoexposure lock (			84) or exposure compensation
	(	86), but is recommended in most other cases.
	Camera meters entire frame but assigns greatest weight to area in center
Center-	of frame 8 mm (0.31˝) in diameter, shown by corresponding 8-mm refer-
	ence circle in viewfinder. Classic meter for portraits; recommended when
weighted	using filters with exposure factor (filter factor) over 1 × (				191).
	Camera meters circle 2.3 mm (0.09˝) in diameter (approximately 1% of
	frame). Circle is centered on current focus area, making it possible to
Spot	meter off-center subjects (if Closest subjct is selected for AF-area mode,
	camera will meter center focus area).		Ensures that subject will be cor-

rectly exposed, even when background is much brighter or darker.

To choose a metering mode, press the but- ton and rotate the main command dial. Metering mode is displayed in the control panel:

11—Center Wtd (145)

This option controls the size of the area assigned the greatest weight in center- weighted metering.

75

Taking Photographs—Exposure