Here is a picture from last year showing the LROC Wide Angle Camera (WAC) in a cleanroom at Malin Space Science Systems in San Diego. The WAC (foreground) looks towards the monochromator (grey box) which emits light of a certain wavelength (color). By scanning through all relevant wavelengths between 290 nm (ultraviolet) and 720 nm (very deep red) the color response of each of the 7 WAC (2 UV + 5 visible) filters is determined. In this particular image a spectroradiometer is placed in front of the aperture of the monochromator.
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