Nikon D100 Product Manual - Page 96

Taking Photographs-Exposure 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 currently selected focus area. If your subject is not in the metered area when the picture is taken, exposure will be based on lighting conditions in the background, and your main subject may be under- or over-exposed. To prevent this, use autoexposure lock: 1 Select center-weighted or spot metering. If using center-weighted metering, select the center focus area with the multi selector ( 64). 2 Position the subject in the selected focus area and press the shutter-release button halfway. Keeping the shutter-release button pressed halfway and your subject positioned in the focus area, press the AE-L/AF-L button to lock exposure (and focus, except in manual focus mode). 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