To prevent geometric distortion
and ensure an adequate depth of
field, the camera should be
placed at the subject’s eye
level and approximately 4 ft
(120 cm) from the subject.
By placing the subject on an
adjustable height seat, the
height of the camera tripod can
be fixed.
A lens of about 105 mm focal
length on a 35 mm film camera,
or its equivalent on any other
camera, should provide a
sufficiently flat field-of-view.
The subject’s eyes should look
directly at the camera and the
subject may be either smiling or
not, but unusual expressions and
squinting should be avoided.
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