Download Amateur Telescope Making (The Patrick Moore Practical by Stephen Tonkin PDF

By Stephen Tonkin

This booklet presents an creation to the layout of quite a few telescopes, mounts, and drives compatible for the home-constructor. initiatives contain tools that diversity from a shoestring finances to professional units that aren't commercially to be had. The ability point of every venture is indicated and recommendation is equipped as to what's good to build, given what's commercially on hand. tricks and suggestions are integrated, in addition to listings of respected mail order assets of fabrics and parts.

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Extra info for Amateur Telescope Making (The Patrick Moore Practical Astronomy Series)

Example text

Remember, the goal here is not simply a working mirror, but one suitable for use in a high-performance planetary telescope. 5 as at f/9, in practice this seldom occurs for a number of reasons. First, it is far easier to make a long focal length mirror. The curve is much shallower and the amount of work required to bring such a mirror to the figuring stage is proportionately reduced. The second important advantage results from the nature of the Foucault test. This elegant yet simple analytical tool is a null test for spherical mirrors.

Beyond this simple truth, there is little agreement as to the extent of the harm. Some claim that obstructions smaller than 30% the diameter of the primary mirror inflict image damage that is barely noticeable, while others maintain that any obstruction at all is unacceptable. Most experts however, agree that if the secondary mirror's minor axis is less than 15% of the diameter of the primary mirror then the harmful effects all but vanish. 2). Since a secondary mirror of some size is necessary for the telescope to even work, the best one can do is keep this obstruction, and the resulting harm, to a minimum.

In other words, at the 70% radius, the mirror's surface was too high in relation to the centre and edge zones. Because I had no one available locally to turn to for guidance, the project went into limbo for 2 years. It was then that I discovered the telescope making forum on CompuServe. A familiar name appeared regularly, giving advice to all who asked. I recognised his name, Tom Waineo, as that Shoestring Telescopes of a contributor over the years to Sky & Telescope magazine. Tom had retired from a career as a professional optician, and was spending his time helping amateurs with advice and making custom mirrors.

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