F-71 magnifying stereoscope US Army
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F-71 magnifying stereoscope, made by Fairchild Aviation Corporation, New York, 1942.
Serial number 42/7017 in its wooden transport box.
Stereoscopes allow two overlapping aerial photos to be viewed simultaneously, giving greater detail and a 3D effect.
They were used during World War Two by trained photographic interpreters to view aerial photographs, in order to gain detail of enemy sites for intelligence reports that were used to plan military operations.
This set used a combination of mirrors, prisms and a 4 power magnifying binocular set to enhance the photographs.
