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The RAC is a box-shaped imager with a double Gauss lens system, commonly found in many 35 mm cameras, and a charged-coupled device similar to those found on many consumer digital cameras. Two lighting assemblies provide illumination of the target area. The upper assembly contains 36 blue, 18 green, and 18 red lamps and the lower assembly contains 16 blue, 8 green, and 8 red lamps. The RAC has two motors: one sets the lens focus from 11 mm to infinity and the other opens and closes a transparent dust cover. The instrument's magnification is 1:1 at closest focus, providing image resolutions of 23 microns per pixel.