97Taking Photographs—ExposureAutoexposure LockWhen center-weighted metering is used, an area in the center of the frameis assigned the greatest weight when determining exposure. Similarly, whenspot metering is used, exposure is based upon lighting conditions in the se-lected focus area. If the subject is not in the metered area when the pictureis taken, exposure will be based on lighting conditions in the background,and the main subject may be under- or over-exposed. To prevent this, useautoexposure lock:1 Select center-weighted or spot metering. Ifusing center-weighted me tering, select thecenter focus area with the multi selector (76).2 Position the subject in the selected focus area and press the shutter-re-lease button halfway. With the shutter-release button pressed halfwayand the subject posi tioned in the focus area, press the AE-L/AF-L buttonto lock exposure (and focus, except in manu al focus mode). Confirm thatthe in-focus indica tor (●) appears in the viewfinder.While exposure lock is in effect, an AE-L indicator will appear in theviewfinder.
