1-16. DESCRIPTION OF LENS ASSEMBLY.
The lens assembly
includes
a
lens,
shutter, lens board, and cable release (fig 1-49).
a. Lens. The lens is a four-element anastigmatic-type XII copying unit.
It has a focal length of 12 inches and a maximum aperture of f/6.3. The lens
elements are coated to reduce internal reflections.
Figure 1-49.
Lens Assembly.
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