By Stephen Tonkin
This publication presents an creation to the layout of numerous telescopes, mounts, and drives appropriate for the home-constructor. initiatives comprise tools that variety from a shoestring price range to expert units that aren't commercially on hand. The ability point of every undertaking is indicated and suggestion is supplied as to what's good to build, given what's commercially on hand. tricks and information are integrated, in addition to listings of respected mail order assets of fabrics and elements.
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Additional info for Amateur Telescope Making (The Patrick Moore Practical Astronomy Series)
2 in (5 mm) took 20 hours of actual grinding time, not including charging with abrasive and cleaning between wets. 00 at a local hardware store. I sealed the disc with high-quality epoxy left over from a boat project. After it was dry to the touch, I epoxied 2 in (5 cm) square ceramic tiles to the surface of the stone. 2 in (5 mm), the tiles eventually became too thin at the edges and I had to secure fresh tiles across the total surface. The cost of grinding and polishing was fairly low because I split with three other amateurs a bulk purchase of grinding and polishing materials.
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. Both Tom and I used Dick Suiter's Foucault reduction program ADMIRR. With my Foucault readings sent via Email, Tom could instantly see the same profile that I was seeing, 500 miles away. By Email, Tom advised me to make a 2 × 6 in rectangular lap which would aggressively lower the 70% zone's peak without further lowering the centre or edge.
You can calculate the secondary's absolute minimum size easily. Simply measure the distance from the centre of the tube to where you want the focal plane to be - usually about 1 /2 in (1 cm) beyond the top of the fully retracted focuser. 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.