Nikon D1 - Manual (Page 63)

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3 With the button held down, recompose your photograph (A) and shoot
(B).
Tips
While the button is held down, you can adjust shutter speed (when
shutter-priority auto is selected as the exposure mode), aperture (aperture-
priority auto), or flexible program (programmed auto). The aperture (in
shutter-priority auto), shutter speed (aperture priority auto), or flexible
program are automatically adjusted to produce the exposure set using
auto-exposure lock. The adjusted values for shutter speed and aperture
are displayed in the viewfinder and the control panel on top of the camera.
Metering can not be changed while exposure lock is in effect. Any changes
to metering will take effect only after the
button is released.
A B
Camera Settings: Auto-Exposure Lock
Camera settings can be changed so that auto-exposure locks when the shutter-
release button is pressed half way. See “Custom Settings,” item 7.
The size of the area given the greatest weight in center-weighted metering can be
set to 6mm (0.24˝), 10mm (0.39˝), or 13mm (0.51˝) (see “Custom Settings,” item
14). Alternatively, you can set center-weighted metering to use the average of the
entire frame. The default setting is 8mm.
Camera settings can be changed so that auto-exposure lock remains in effect after
you release the
button. In this case, normal auto-exposure will be restored the
next time the button is pressed. See “Custom Settings,” item 21.