Books  Physical Sciences  Cosmology & Astronomy 

Collimating a Newtonian and Instructions in the Use of the Cave Telescope Collimator

Handbook / Manual

By: Peter R Clark (Author)

16 pages, colour & b/w photos, colour & b/w illustrations

Peter R Clark (privately published)

Paperback | Nov 2012 | #221923 | ISBN-13: 9780957645400
Availability: In stock
NHBS Price: £7.50 $9/€8 approx

About this book

This booklet contains instructions to getting telescope mirrors aligned for speed, accuracy and reliability, using the Cave Collimator, which has been invented and is being sold by the author.

Abstract of the instructions.

[1]. Screw both mirrors fully out then back equally to 2 turns off on primary mirror adjusters, secondaries 0 to 2 turns. Sense the secondary adjusters' contact and firm them lightly to begin from geometrically square with scope for optical adjustments. Do not fall for everything looking absolutely concentric down the focus tube through the peephole eyepiece by adjusting the secondary mirror adjusters individually just because you find the process easier than counting equal turns. Norton's Star Atlas 11th edition 1950, page 50. Dead equal turns on the adjusters when experimenting with the centre bolt position to achieve no overlapping is quite sufficient.
[2]. Fit the collimating cover (a white wall can substitute but you lose the cross sights at focal length) and align the peephole eyepiece so that it's cursor lines up with the focus tube axis. Then if the doughnut is to one side, rotate the secondary mirror to bring it over the focus tube axis.
[3] covers the vertical tilting of the primary mirror, after which the star test can often indicate all done. If it doesn't, the one task for which modern technology helps is tilting the secondary mirror vertically only so that a laser collimator's beam reflects off the horizontal cross sight as imagined by the doughnut, without steering the beam towards the centre. Arthur P. Norton B.A. invoked again, as is Sky & Telescope Oct. 2010 p.70, suggesting or for real that only one adjuster and a centre bolt are needed and which the author came to realised independently from March 2012. The boldest measures are the best."

Its use extends to include the more complex telescopes with handier main tube lengths.

"'The Cave Collimator was excellent for my Maksutov–Newtonian telescope and very good for my Rumak–Cassegrain."
- Professor Ian Morison, Jodrell Bank

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