This is a hands-on book for the amateur who has always wanted to make a refractor. The author adopts the role of coach and guides the reader, step by step, through all aspects of making a doublet lens; from the characteristics of glass, abrasives, and pitch to methods for mounting the finished lens. The author’s spreadsheet programs, included on CD-ROM, provide a direct approach to designing a well corrected lens. For those not interested in lens design, prescriptions are provided (more…)