Canon Model 7S - Manual (Page 35)

FOCUStNG
The lens has a "stopper" at the infinity position.
Release the lens by pressing the stopper and
rotating the iens barrel. The lens will move
back and forth by rotating the iens barrel, which
is coupled to the rangefinder, enabling you to
focus. Canon telephoto lenses do not have a
stopper.
Range-Viewfinder
When you look through the range-viewfinder
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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18 In correct focu« Out of focus 50mm F 1.2