Nikon D100 Product Manual - Page 97

Controlling How the Camera Sets Exposure 3 Keeping the AE-L/AF-L button pressed, recompose your photograph and shoot. Taking Photographs-Exposure Metered Area In spot metering, exposure will be locked at the value metered in a 3-mm (0.12˝) circle centered on the selected focus area. If closest subject priority ( 67) is in effect, the center focus area will be used to set exposure. In center-weighted metering, exposure will be locked at the value metered in an 8-mm (0.31˝) circle at the center of the viewfinder. Adjusting Shutter Speed and Aperture While exposure lock is in effect, you can change the following settings without changing the metered value for exposure: Exposure mode Auto multi program Shutter-priority auto Aperture-priority auto Settings Shutter speed and aperture (flexible program; 78) Shutter speed Aperture The new values can be confirmed in the viewfinder and control panel. 14-AE-L/AF-L ( 154) Depending on the option selected, the AE-L/AF-L button locks both focus and exposure (the default setting), only focus, or only exposure. If you choose AE Lock Hold, exposure will lock when the button is pressed and remain locked until it is pressed again. 15-AE-Lock ( 155) If +Shutter Button is selected for AE Lock, exposure will lock when the shutter-release button is pressed halfway. 85