Canon AT 1 User Manual
Page 90
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Film Plane Indicator
This mark is engraved on the top of the
camera beside the film rewind crank, just to
the left of the pentaprism, to indicate the
exact position of the film plane. The distance
scale on the lens shows subject distances
measured from the film plane indicator. This
mark is not used in general photography, but
in close-ups and macrophotography it can be
used to obtain the exact film-to-subject
distance.
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