Nikon 25214 D70 User's Guide - Page 85

Taking Photographs-Exposure 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- low) or dark (black or dark green) colors, when its results approach what 3D color is seen by human eyes. 3D color matrix metering, which uses range informatrix/ 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 of frame 8 mm (0.31˝) in diameter, shown by corresponding 8-mm referCenter- 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 meter off-center subjects (if Closest subjct is selected for AF-area mode, Spot 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 button 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 centerweighted metering. 75