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.....The
Lunar Orbiters had an ingenious imaging system,
which consisted of a dual-lens camera, a film
processing unit, a readout scanner, and a film
handling apparatus. Both lenses, a 610-millimeter
narrow angle high-resolution (HR) lens and an 80-millimeter
wide-angle medium resolution (MR) lens, placed
their frame exposures on a single roll of 70-millimeter
film.
.....The axes of the
two cameras were coincident so the area imaged in
the HR frames were centered within the MR frame
areas. The film was moved during exposure to
compensate for the spacecraft velocity, which was
estimated by an electric-optical sensor. The film
was then processed, scanned, and the images
transmitted back to Earth. |
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