Collimating SCTs: A straightforward guide to basic and advanced collimation of these popular scopes. Not only is secondary adjustment described in detail, but also primary mirror alignment and corrector centering. Details of easy-to-perform tests that determine if collimation problems are coming from something other than the secondary mirror, and how to handle them. Fully illustrated with REAL photos of scopes under examination. No computer-generated images or hand sketches. 80 pages, B&W softcover, $13.95