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How to Build a Dobsonian Telescope
How to Build a Dobsonian Telescope
This is a .pdf version of the website any link on this page will start your
browser and take you to that site. If you wish to print a page select the page
number and print the one you want. Do not print the first three pages it will
use all your black ink!
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How to Build a Dobsonian Telescope
This manual was created using Acrobat 4.0 you need to download the latest
free reader to view this manual properly! Older readers will give you strange
results.
TABLE OF CONTENTS
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How to Build a Dobsonian Telescope
E-mail:
To my other WebPages:
Ray Cash-Le Pennec
Visitors since March 29, 1998
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Dobsonian Telescope Plans
Plans for Building a Dobsonian Telescope
Y es, it "looks like a cannon," but the above is really a ten-inch (measured by the diameter of the
objective) Newtonian telescope that almost anybody can build. Here you will find plans to build this
telescope, or a smaller one--either a six-inch, or an eight-inch--of identical design. These plans are only
slightly modified from the plans The Sidewalk Astronomers have been sending to interested parties for a
mere $2.00 via snail-mail. I have kept as close to this design as possible: One, because this is--hands
down--the cheapest and easiest way to make a quality telescope; and two, because I walk in the shadow
of John Dobson, who invented many of these designs which have revolutionized amateur and
professional astronomy alike... Besides, Los Angeles Sidewalk Astronomer , Pam Reid, did most of the
work by writing and typing the procedures, as well as gathering the drawings--which, by the way, were
done by Earl Jungians (from photographs of John at work by Molly Lusignan). Most of my "work"
consisted of scanning and re-typing Pam's work... though I do interject my two-cents here and there.
In the category of "the left hand not knowing what the right hand is doing," another Webpage, supported
by NASA's Telescopes in Education Project, also have these plans online . Here you will find the
original plans--images and text scanned together, without my minor meddling--which includes, by the
way: the Six-inch plans, the Sun Telescope construction tips page, a Links page, and a real person to
E-mail your questions to. Regardless, it is a beautiful page, and I recommend you check it out;
especially if you have any problems printing the plans from this page.
If you would like to grind, polish and figure your own mirror, I suggest Victor's Telescope Making page
as well as the late Sam Brown's book , All About Telescopes , which may be ordered from Orion
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Dobsonian Telescope Plans
--Ray Cash-Le Pennec
Introduction
T he plans you will find on these pages, are, by and large, the result of years of trial and error on the part
of John Dobson, one of the founders of The San Francisco Sidewalk Astronomers and a prolific
telescope maker. John has, quite literally, helped thousands of people make telescopes of this design!
Only in the past few years have commercial telescope manufacturers adopted the Dobsonian approach to
make affordable, alt-azimuth Newtonian telescopes... However, the three top manufacturers (henceforth
referred to as: "The Big Three"), Celestron, Meade, and Orion, continue to fall short mechanically of the
simple designs found on these pages. All of The Big Three, for example, use Melamine ; a kind of coated
particle board, which is heavy, not durable, in short; not as strong or light as plywood, which, of course,
we recommend. All of The Big Three have undersized pivot bolts, do not use Teflon as bearing surfaces
(there is no substitute!), and have shoddy mirror cells (tailgates). The list goes on... They do look
"pretty," especially in photos; I'll give them that. If you happen to own one of these scopes; you might
well peruse these pages to find ways to tinker and fix up your mass-produced Dob: you can only improve
what you got! It ain't rocket science!
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