Nikon D7100 Product Manual - Page 113
Metered Area, Adjusting Shutter Speed and Aperture, See Also, Shutter-release button AE-L
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A Metered Area In spot metering, exposure will be locked at the value metered in a 3.5-mm (0.14 in.) circle centered on the selected focus point. In center-weighted metering, exposure will be locked at the value metered in a 8-mm circle in the center of the viewfinder. A Adjusting Shutter Speed and Aperture While exposure lock is in effect, the following settings can be adjusted without altering the metered value for exposure: Mode Setting P Shutter speed and aperture (flexible program; 0 48) S Shutter speed A Aperture The new values can be confirmed in the viewfinder and control panel. Note that metering can not be changed while exposure lock is in effect. A See Also If On is selected for Custom Setting c1 (Shutter-release button AE-L, 0 236), exposure will lock when the shutter-release button is pressed halfway. For information on changing the role of the A AE-L/AF-L button, see Custom Setting f4 (Assign AE-L/AF-L button, 0 256). V 85