Polaroid 600 series Manual page 7

Applies only if your camera has a close-
up lens: To take a close-up photo, slide the
close-up lens (P) lever (located at the front
of your camera) to the right. Frame your
subject in the oval area of the viewfinder.
Everything from 0.6 - 1.2 meters (2 - 4
feet) will now be in sharp focus.
With autofocus cameras stand at least
0.6 meters (2 feet) away from your subject.
Your camera will send out soundwaves (at
frequencies beyond our range of hearing)
to the central part of the scene to measure
the distance between you and your subject
(Q). According to this the lens will put your
subject into sharp focus.