Fiducial points come in a
variety of differing shapes and
configurations, depending upon the make and model of the camera.
Some points are even marked by merely leaving a small "notch" pointing
outward along the photo's edge.
Earlier model cameras
only placed one
fiducial marker in the
center of
each outer edge of a
photo, but by 1980 many were also made to
imprint them in the corners of each photo.
Because of this, many photos will have fiducials
in both the outer centers
and outer
corners, as with the example photo
above.
Most cameras older than about 1960 were not equipped to
imprint fiducials on photos, and therefore show no fiducials at all.
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