Canon Model 7 - Manual (Page 19)

Focusing
The lens has a "stopper" at the infinity
position. Release the lens by pressing
the stopper and rotating the lens barrel.
The lens will move back and forth by
rotating the lens barrel, which is coupled
to the rangefinder, enabiing you to focus.
Canon teiephoto ienses do not have a
stopper.
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RANGE-VIEWFINDER . . .
When you look through the range-view-
finder eyepiece and rotate the lens barrel,
you will see two images either coincide
or remain apart within the comparatively
bright square in the center. When they
coincide, your lens is in focus.
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