sentences:  Most images were taken at low Sun angles, which is useful for petrologic studies but not for observing morphology.The sensor consisted of a [[catadioptric telescope]] with an aperture of 46 mm and fused silica lenses focused onto a coated Thompson CCD camera with a bandpass of 250–1000 nm and a six-position filter wheel.The wavelength response was limited on the short wavelength end by the transmission and optical blur of the lens, and on the long end by the CCD response.