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.
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Notes:
Ii With the focus lock butlon held down, the in -focus indication (~<III) may change in the following two cases: 1) when you once again depress the shutler relea se button halfway after the camera 's auto- matic 16-sec. switch has turned off the indication, or 2) just after you have taken a picture. However, regardless of the focus indication change, the distance set on the ler)s is still the same as when you depressed the focus lock button.
2)When taking pictures in the automatic exposure mode with the main subject off-center, you must also depress the memory lock button ® to get the correct exposure. For more information, refer to page 40.
