Nikon 25214 D70 User's Guide - Page 94

Taking Photographs-Exposure Autoexposure Lock When center-weighted metering is used, an area in the center of the frame is assigned the greatest weight when determining exposure. Similarly, when spot metering is used, exposure is based upon lighting conditions in the selected focus area. If the subject is not in the metered area when the picture is taken, exposure will be based on lighting conditions in the background, and the main subject may be under- or over-exposed. To prevent this, use autoexposure lock: 1 Rotate the mode dial to P, S, or A and select center-weighted or spot metering (exposure lock has no effect in mode M, while Digital Vari-Program modes are not recommended as center-weighted and spot metering can not be selected in these modes). 2 Position the subject in the selected focus area and press the shutter-release button halfway (when using center-weighted metering, position the subject in the center focus area). With the shutter-release button pressed halfway and the subject still positioned in the focus area, press the AE-L/AF-L button to lock exposure. Confirm that the in-focus indicator (●) appears in the viewfinder. While exposure lock is in effect, an EL indicator will appear in the viewfinder. 84