Operation Manual

Image-Size Lock
When you press and hold the lens-function button on an xi-Series lens,
Image-size lock will automatically adjust the lens' focal length to maintain
the size of the main subject's image in the viewfinder.
Image-size lock is limited by the focal length range of the lens you are
using. If either end of the lens focal length range is reached while
image-size lock is operating, the lens will stop zooming, but IMAGE LOCK
will continue to be displayed in the viewfinder. If your subject comes back
into range, Image-size lock will resume operation. To turn off Image-size
lock, release the lens-function button.
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