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  6. Metering (Live View Photography)

Digital SLR Camera Basics

Metering (Live View Photography)

“Metering” is used to measure the brightness of the subject. The camera optimizes exposure by adjusting shutter speed, aperture (f-number), and ISO sensitivity according to the brightness of the subject. In live view, the brightness of the subject is measured based on the light striking the image sensor. The camera does not simply measure the overall brightness of the subject, but measures brightness separately in multiple areas of the frame. The method used to choose the areas metered and how they are metered is referred to as the “metering method” or “metering mode”.
Normally, the camera uses “matrix metering”, metering multiple segments covering a wide area of the frame and adjusting exposure based on such information as brightness and color. Other metering methods include “center-weighted” metering, in which the center of the frame is assigned the greatest weight in determining exposure, and “spot” metering, in which the camera meters only the area around the current focus area. By choosing methods suited to their subjects and creative intent, photographers can achieve results that are closer to their goals.
In viewfinder photography, exposure is measured from light falling not on the image sensor but on a ded-icated metering sensor, which may produce results that differ from those obtained during live view. During movie recording, exposure is set using matrix metering.

Matrix Metering

Matrix Metering

Exposure is adjusted for a balance between bright and dark areas of the frame.

Note: Red lines are artist's concept only and do not correspond to actual metering segments.

Center-Weighted Metering

Center-Weighted Metering

Exposure is optimized for the lighting at the center of the frame.

Note: Red circle is artist's concept only and does not correspond to actual metering area.

Spot Metering

Spot Metering

Exposure is optimized for the subject in the focus area.

Note: Red circle is artist's concept only and does not correspond to actual metering area.


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