Janis, I'd recommend 'Star Testing Astronomical Telescopes -- A Manual for Optical Evaluation and Adjustment' by Harold Richard Suiter. Published by Willmann-Bell. ISBN 943396-44-1. Peter ----- Original Message ----- From: "Janis Schoenfeld" <ganymedes@xxxxxxx> To: <az-observing@xxxxxxxxxxxxx> Sent: Wednesday, July 12, 2006 8:15 PM Subject: [AZ-Observing] Optics Hi to All, Need some help. I'm looking for a good, in depth book on astronomical optics and would appreciate any suggestions and/or recommendations very much. Thanks, Janis Schoenfeld -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.