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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