Rose, Albert. Vision, Human and Electronic. New York: Plenum, 1973. Although it was written long before CCDs were invented, this book sheds light on the physical processes behind human vision and electronic image capture. The text is outstandingly clear in exploring the relationships between signal-to-noise ratio, image contrast, and resolution. It is a book that will never be out of date.
Suiter, Richard Harold. Star Testing Astronomical Telescopes: A Manual for Optical Evaluation and Adjustment. Richmond, VA: Willmann-Bell, Inc., 1994. "I'm going to tell you a little-known fact. Telescopes are easy to test " Thus begins Suiter's treatise on testing the optical performance of amateur telescopes. Every observer (and every CCD imager) should own a copy of this book.
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