Bøger af Stephen Tonkin

Small telescopes have a lot to recommend them.Cost is of course a consideration, but their most positive feature is sheer portability. Some manufacturers have tried to make large telescopes more portable (with mixed success), but the opposite approach, that of making small telescopes more effective, is what this book is all about.Good 2-inch (60mm) telescopes are now available for beginners, and major American manufacturers now offer small, affordable computer-controlled instruments that are capable of superb results.Stephen Tonkin has gathered the experience of users of small telescopes to provide an insight into just what is possible - for newcomers to astronomy or experienced observers who simply want to use a small, really portable telescope.

Many amateur astronomers make their own instruments, either because of financial considerations or because they are just interested. Amateur Telescope Making offers a variety of designs for telescopes, mounts and drives which are suitable for the home-constructor. The designs range from simple to advanced, but all are within the range of a moderately well-equipped home workshop. The book not only tells the reader what he can construct, but also what it is sensible to construct given what time is available commercially. Thus each chapter begins with reasons for undertaking the project, then looks at theoretical consideration before finishing with practical instructions and advice. An indication is given as to the skills required for the various projects. Appendices list reputable sources of (mail order) materials and components. The telescopes and mounts range from "e;shoestring"e; (very cheap) instruments to specialist devices that are unavailable commercially.

"Binocular Astronomy", 2nd edition, extends its coverage of small and medium binoculars to large and giant (i.e., up to 300mm aperture) binoculars and also binoviewers, which brings the work into the realm of serious observing instruments.