By Stephen Tonkin

ISBN-10: 1852330007

ISBN-13: 9781852330002

This e-book offers an creation to the layout of various telescopes, mounts, and drives appropriate for the home-constructor. initiatives contain tools that diversity from a shoestring funds to professional units that aren't commercially on hand. The ability point of every undertaking is indicated and suggestion is supplied as to what's brilliant to build, given what's commercially on hand. tricks and tips are incorporated, in addition to listings of respected mail order resources of fabrics and parts.

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

Example text

25 in (135 mm). Take this number and divide it by the telescope's focal ratio. 58 in (15 mm). A little experimentation quickly reveals the importance of a low-profile focuser. Indeed, it is virtually impossible to keep the secondary reasonably small if a standard rack-and-pinion focuser is used. Such a focuser often stands more than 4 inches tall and would require a secondary mirror nearly twice as large. 58 in across really work? Yes, but there is a catch. With such a small secondary, only the onaxis rays will be deflected to the focal plane.

The finder is used with both eyes open, one eye looking into the lens, the other looking at the sky. The observer's brain superimposes the image of one eye upon that of the other and the visual effect is that a red dot is placed on the sky. Some experimentation will probably be necessary to obtain a suitable pinhole. The method I have found to be most satisfactory is to place the foil on a metal surface and to use a very fine needle. I rotate the needle, like a drill, between finger and thumb and use very light pressure.

Using the same technique, my efforts failed. 5 in from the centre), then descended to the edge. 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.

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Amateur Telescope Making (The Patrick Moore Practical Astronomy Series) by Stephen Tonkin


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