Nikon F50 Instruction Manual page 25

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To change a combination of shutter speed/aperture
In the General-Purpose Program, you can change the combination of
shutter speed/aperture by pressing the button above '" or
.A.
Press
the button above '" for faster shutter speed/wider aperture (smaller
f-number) ; press the button above '" for slower shutter speed/
smaller aperture (larger f-number) . Pressing and holding the button
down changes the shutter speed/aperture combination rapidly.
p: + :
appears
in the LCD panel and ·· ••
appears inside the viewfinder,
indicating the change in shutter speed/aperture.
• The original shutter speed/aperture combination for General-
Purpose Program is recalled when the LCD indication
automatically switches off, when you turn the camera power off,
when you switch to SIMPLE mode or when you use flash .
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