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Read Online or Download Amateur Telescope Making (The Patrick Moore Practical Astronomy Series) PDF
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Additional resources for Amateur Telescope Making (The Patrick Moore Practical Astronomy Series)
3 (overleaf). The precise positioning of the pinhole is achieved by clamping the finder and sighting at the night sky. The pinhole is properly positioned when there is no observable parallax between the pinhole and the stars when you move your head. The twist-drill makes a suitable tool for pushing the foil back and forth in the tube. The position of the LED is not critical, but obviously it should be close to the foil. I made a mounting bracket out of aluminium strip. I drilled this to accept a toggle switch which is wired in series with the LED and the battery.
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.
On the end of each bolt, I secured with Loctite a plywood knob and T-nut assembly. With the mirror in the sling, four pieces of broomstick prevent lateral movement. This technique was first described by David Kreige in Telescope Making no. 35. Each dowel has an off-centre hole bored end to end which allows lateral adjustment of each dowel in order to barely clear the mirror's edge. A nut and bolt secure the dowel to the tailgate. The mirror does not touch the dowels. Four mirror clips are fastened on top of each Shoestring Telescopes dowel.