Figure 2-3.
Location of focal length
c. Therefore, a lens labeled as an 8-inch or 200-mm lens indicates that
when it is focused on a point at infinity, the distance from its optical
center to the focal plane will be eight inches.
NOTE: The remaining lesson on focal lengths in this subcourse will
be based on lenses used for 35mm camera format, since most military
photographers possess this camera equipment.
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