Canon Model 7 - Manual (Page 20)

RANGE-VIEWFINDER SELECTOR . . ,
When you look through the range-view-
finder, you will see a white frame and a
figure. The figure indicates the focal length
of the lens, and the view seen within the
white frame in the viewfinder is that which
will be recorded on the film The field of
view indicated by a white frame varies
according to the focal length of the lens
used when the range-viewfinder selector is
shifted. The range-viewfinder can be used
for the focal lengths of 35 mm, 50 mm,
85 mm, 100 mm lenses. You will see a
double white frame for 85mm and 100mm
focal lengths. Within the outer white
frame is the field of view for an 85 mm
lens. In the inner white frame area is the
field of view for a 100 mm lens. •
• The white frames are coupled to the
focusing mechanism. Parallax compen­
sation is automatic.