Focus lock – Nikon Camera F3AF User Manual
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Focus lock
The AF-Nikkor lens has two focus lock buttons ® on the lens
barrel, one on the side and the other on the A-M switch. You can
use either of these buttons, depending on your choice of hori
zontal- or vertical-format shooting. During autofocus operation,
depressing the focus lock button allows you to lock in the auto
focus distance setting on the lens. Autofocus begins once again
as soon as you release the button.
To take pictures with the main subject off-center, first center the
main subject within the focusing frame in the viewfinder, depress
the shutter release button halfway and make sure both focus
indicators light up: then depress the focus lock button and, while
holding it in, recompose and shoot.