Film plane indicator, Distance scale – Canon A-1 User Manual
Page 133
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Film Plane Indicator
This mark is engraved on the top of the
camera beside the film rewind knob, just to
the left of the pentaprism, to indicate the
exact position of the film plane. It is not
used in general photography, but it is helpful
in close-up photography and photomacro-
graphy for obtaining the exact shooting
distance from film to subject.
Distance Scale
The distances on the scale are calibrated
from the film plane to indicate the focused
distance from film plane to subject.
The scale is not generally used except
when confirming depth of field, perfor
ming guide number calculations in flash
photography, or using infrared film.
Read one-digit distances in the middle of the
number marked on the scale. Two-digit
distances should be read at the point be
tween the two digits.
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