Ae-L (Auto Exposure Lock) Lever - Nikon N90 AF Instruction Manual

AE-L (AUTO EXPOSURE LOCK) LEVER
In the auto exposure mode, when you want to control exposure
based on the brightness of a specific area within the scene,
switch the metering system to Center-Weighted or Spot and
use the AE-L lever as follows:
1. Center main subject inside viewfinder and/ or move in closer
until reference circle for Center-Weighted metering or Spot
metering is fully covered by the subject.
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2. Lightly press shutter release button , and confirm shutter
speed and aperture in viewfinder.