Nikon D50 D50 User's Manual - Page 107

Autoexposure Lock If the subject is not in the metered area when center-weighted or spot metering is used, exposure will be based on lighting conditions in the background, and the main subject may not be correctly exposed. This can be prevented using 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). 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. 3 Without releasing the AE-L/AF-L button, recompose the photograph and shoot. Setup Custom Settings Adjusting Shutter Speed and Aperture While exposure lock is in effect, the following settings can be changed without altering the metered value for exposure: Mode P S A Description Shutter speed and aperture (flexible program; 42) Shutter speed Aperture Advanced Settings 14: AE-L/AF-L controls the function performed by the AE-L/AF-L button ( 98). 15: AE Lock controls whether exposure locks when the shutter-release button is pressed halfway ( 99). 97