Canon Model 7 - Manual (Page 36)

DEPTH-OF-FIELD SCALE . . .
The depth-of-field scale shows you the range of subjects which will be in sharp focus
on the film. This range will vary with the “F” stop selected. For example:
The depth-of-field will be deeper. . .
the smaller the lens aperture
the shorter the lens focal length
the farther the distance of the subject.
The depth-of-field will be shallow...
With an "F” stop of F5.6, and the subject you have focused on at 25-feet, your
camera will give you a sharply focused picture from approximately 16-feet to 55-
feet away from the camera. At F 11, you will get a sharp picture from 12-feet to
infinity (oo) .
30
S F 5.6
F 1 1
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Distance Index Mark