Mamiya 7 II - Manual (Page 30)

Photographing to conform to purposes
AE Lock (AEL) Photography
The AEL position is very useful when making selective exposure measurements of important subject
areas which are not in the center of the finder image when faced with difficult lighting conditions.
1. Align "AEL" on the shutter speed dial.
Rotate the shutter speed dial until "AEL" aligns with the
white index mark on the camera body.
2. Half-pressing the shutter button.
Position the important part of your subject in the central
square of the viewfinder -this will establish the correct
exposure. Then touch the shutter release button slightly
and an LED will light indicating the correct exposure.
3. When changing composition.
In above state, the exposure reading will be memorized.
After adjusting for composition as desired, release the
shutter.
If you cannot get close enough to your subject for another meter reading make substitute measurements
by pointing the camera to light and dark areas and calculate a mean exposure value or try taking a reading
off your palm.
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