It All Starts With The Mount
At some time or another, most amateur astronomers acquire through some
means or another a telescope that doesn't have a tripod. Or, in some cases,
a telescope with an inadequate mount. In fact, in today's market these are
lots of inexpensive refractor telescopes out there that might tempt you, and
most actually have quite good objective lenses in them. But most come with
pretty shaky mounts, which pretty much ruins the experience.
If you've done much shopping for telescopes and accessories, you know by now
that a decent telescope tripod costs a couple hundred dollars or more. A good
example is the Celestron
CG-4 German Equatorial Mount and Tripod . This is a full equatorial mount of good stability,
and for a reasonable price as good telescope mounts go, but not likely the
mount you get with an inexpensive telescope. And when I started into astronomy some 50 years ago, the general advice was that one should get an equatorial mount.
But the secret I've learned, once I decided that I enjoy observing more than the tedious endeavor of astro-photography, was that a well built altazimuth mount is much easier to use, and less expensive. For example, check out the
Celestron Heavy-Duty Altazimuth Tripod, a perfectly adequate and easy to use altazimuth mount that can certainly well handle a 60mm refractor.
And here's another secret -- you can make the inexpensive altazimuth
telescope tripod described on this page and have a super-solid mount for any
small telescope. With a couple of different attachments, it can easily handle
either of my refractor telescopes or my compact ETX 90 Maksutov. The total cost
was only about $50 just a few years ago. I get double duty with this design,
and if I happen to lay hands on another small scope to play with, it'll be easy
to add an attachment to carry that telescope as well.
The Basic Tripod
Shown at left is the basic pipe fitting tripod design, plenty strong enough
for any small reflector or refractor telescope. It consists of a section of
2" pipe for the basic stand.
A 2" flange is mounted to a double-layer 3/4" plywood base.
Three 1" lengths of copper pipe extend from the center pipe to the
extremes of the triangular base. Copper was used because the ends could
be flattened for easy fastening to the center pipe and base. These lengths
of pipe help make the tripod more rigid, stopping those annoying vibrations
when you're trying you use your telescope on a high resolution target, like
the moon, or Mars, or those close double stars.
An even more solid mount could be made by welding pipe legs onto the
center pipe, and letting them extend to the ground. This would eliminate
the plywood base.
I choose the wood base design at the time I constructed it because I didn't
have a welder in my tool arsenal.
On top of the tripod is mounted a altazimuth head designed to support a
2" refractor. It would easily support a 60mm refractor telescope, and
likely a 70mm to 80mm refractor. It's super solid if used with a 90mm Maksutov
telescope, with which I use a wedge that puts the Maksutov in an equatorial
By going to 2 1/2" or 3" pipe instead of 2", it could be
sized up to handle a larger telescope.
The Tripod Feet
The tripod feet are shown in this image.
First I mounted three 3/4" flanges to the underside of the plywood
Then I simply screwed in three short (each the same length) nipples into
the flanges, and capped them to prevent them from digging into the ground.
The result is a stand that is portable enough to be easily moved around
the yard, yet very sturdy.
In addition, about the only tools I needed was a pipe wrench or large
pliers, and a drill.
The Tripod's Refractor Head
Shown is the altazimuth head that can be mounted on the tripod to support
the 2" refractor telescopes.
It consists of a coupling that connects to the base, an extender to
accommodate the length of the telescope, and the turn-on-thread bearing
The azimuth bearing is formed by a 90 degree street elbow.
The street elbow screws into a flange that is mounted to a wooden bracket
that holds the telescope. This makes the elevation bearing.
To make the thread bearings work smoothly, I polished the threads with some
valve grinding compound obtained at a local auto parts store. The valve
grinding compound is a kind of gritty, greasy paste.
I put some of the compound on the azimuth threads, then screwed on the
street elbow. I repeatedtly tightened the street elbow to hand tight and then
backed it off. The grinding compound polished the threads of both the extender
pipe and the street elbow. After a few minutes, I was able to turn the fitting
a couple of turns further then when I started before the street elbow would be
tight. Once you've gained a couple of additional turns, the threads are
probably polished enough.
I then removed the street elbow and cleaned the extender and street elbow
threads, applied a light coating of grease, and screwed the street elbow
back on. It now turns smooth as butter.
I did the same to the elevation bearing formed by the horizontal
section of the street elbow and the flange.
The Tripod Supporting Refractor
This image shows the tripod with the altazimuth refractor head in place,
supporting the 2" refractor telescope. It is, admittedly, a simple
altazimuth mount, but one that is sturdy and has smooth bearings.
While not light as a feather, the unit is light enough that I can leave
the tripod and telescope assembled together, and still carry it out to set up,
or move around the yard.
That provides some pretty short setup time, and lets me squeeze in some
fun observing even if I only have 45 minutes or so for the entire session. I
leave an f/17 60mm refractor on it most of the time, ready to go at a moments
notice. The nice thing about the 60mm refractor telescopes is that they are
light, and temperature stabilize quickly.
The telescope moves easily and smoothly to each target, and remains in place
from the slight stiffness in the large bearings. Pointing adjustments on target
are made with light taps to the telescope tube. Vibrations from the alignment
tapping stop immediately due to the mass of the tripod.
Tripod With Resuscitated 60mm Monolux
One nice thing about this simple but ample tripod is its flexibility.
Since mounting refractors involves nothing more than a hose clamp or two,
it's easy to switch from one telescope to another.
As an example, here's the same altazimuth refractor tripod head with a
resuscitated 60mm Monolux telescope in place. The Monolux is an old Japanese
designed telescope with a classic air-spaced objective. With a bit of loving
care and a replacement 1.25 inch focuser, this telescope still makes a fine
performer, and is supported very well by the pipe-fitting tripod.
Below the telescope, you can see the eyepiece table that's recently
been added to the tripod. It's simply a 1/4 inch thick piece of plywood
with several 1 1/4 inch diameter holes drilled into it, and fastened to
a wooden mounting ring that clamps to the tripod post.
Adding Setting Circles
One thing you might consider as a refinement to your pipe fitting telescope tripod
is to add setting circles. While setting circles are more commonly a thing
found on equatorial mounts, you can definitely use setting circles to find
celestial objects with an altazimuth mount.
The setting circles in this case were created with a perl script. The perl
script can generate setting circles of any given diameter, and marks them with
1 degree, 5 degree, and 10 degree tick marks. The perl script creates a
postscript file ready for printout.
I made my circles to be 6.5 inches in diameter. The printouts of the setting
circles were mounted on 1/4 inch thick tempered hardboard and coated with Mod
Podge to protect them. The elevation settings need only be a quadrant going
from 0 to 90 degrees. The quadrant can be cut from a full circle.
I cut the elevation quadrant and mounted it onto the bracket that holds my
telescope, as shown. To properly position the elevation pointer, I first
leveled the tripod using a level on the base. Then I set a level on the
telescope and rotated the elevation bearing until the telescope was pointing
level. Next, I mounted a pointer (a large nail) so that it pointed at the
quadrant zero reading while the telescope was pointing level.
I mounted the azimuth circle by mounting it onto a split ring cut from
plywood. The split ring was cut a tad too small to fit over the shaft of the
tripod, but with a cut through the ring (the split), it can be sprung open
enough to fit snuggly around the vertical shaft of the tripod. In this way, I
can turn the azimuth circle to proper position when aligning the telescope. I
added a pointer for reading angular position.
You can get your own Setting Circle PDF copy here or click on the image at left. This will allow
you to download a pdf file with a circle about 7.5 inches in diameter. You
can use a copy machine to rescale the image to the diameter you wish. Check
out the Dobsonian Review page to see how setting circles were added to my DOB.
I took a copy down to a copy store and enlarged it to an 11x17 inch paper,
which gave me a 10 inch diameter setting circle. I used this to make an
azimuth setting circle for my Planetary DOB.
How Do You Use Them?
The easiest way to make use of your setting circles is by using a
planetarium program on a laptop. Xephem, Stellarium, or Kstars on a laptop lets
you see a star map of what you might want to look at. You click on an item, and
the azimuth and elevation show up on the screen. For Kstars, a right click will
do it, then select details from the pulldown, then position.
For Stellarium and Xephem it's a left click.
To make easy use of azimuth and elevation values:
AT the Beginning of your observing session:
Level the tripod so that pointing the telescope east/west then north/south
will show level then the telescope's elevation reading is on zero.|
Point the telescope at Polaris
Rotate the azimuth circle to read zero azimuth
For the remainder of the observing session:
Select an item in your computer almanac, click to bring up azimuth and
elevation, then point your telescope to those coordinates.
Generally, if you've leveled your tripod and zeroed your azimuth on
Polaris, an object will either show up in your telescope FOV with a low
power eyepiece, or be just outside of the FOV and easily found with a bit
of careful searching.
I have a program in an HP128 calculator that holds a couple of star
catalogs (the Messier and Caldwell lists). It does the same translations as
the computer planetarium programs, and gives me more portability. Pointing
by setting circle saves me loads of time, especially on the dimmer objects
that don't show in my finder.
I can also use my Old Laptop with Linux to make use of my setting circles. While the laptop
is old and has minimal resources (only 83MB of memory), it runs Puppy Linux 431
with Xephem just fine. So you don't need to go out and buy an expensive
laptop for this duty. Get something cheap from Ebay and put Linux
and Xephem on it. If you get one as old as mine, likely Kstars and
Stellarium will be too big for it, but Xephem requires much less resource.
Amazingly, a pipe fitting telescope tripod with setting circles and an old
laptop (or calculator program) can automate your telescope to be nearly as
handy as a computerized telescope. Is that neat or what?
The Cassegrain Wedge
This image shows a simple equatorial wedge I made to support my Meade ETX
90. I have the older model that has a motor only on the right ascension axis,
so to get use from the clock drive the telescope must be in an equatorial
The wedge is a simple triangle of wood cut to tip the telescope's polar
axis by my latitude angle. A bit more thought and I could have built an
To the bottom of the wedge is mounted another 2" flange. The flange
screws to the telescope base, giving a solid yet portable mount for the Meade
The Tripod Supporting Cassegrain
This is an image of the Cassegrain wedge mounted on the tripod base,
supporting the Meade ETX 90.
As you can see, the extender section of pipe isn't needed for the
Cassegrain telescope, so it has been removed.
I've found this to be a very solid mount for the ETX, and it would likely
support at least the ETX 105 as well.
Again, by scaling up the size of the pipe, a larger telescope could
This is the mount that was used for the Meade ETX 90 when it was used
to make the moon images and planet images shown on the etx page.
If this cheap tripod design gives you some slack, money-wise, you might want
to take another look at some small Cassegrains, knowing that with simple tools
and tens of dollars you can make a fine tripod.
You could also take the risk on perhaps a 60mm to 70mm refractor. The 60mm
makes a great first telescope, but often is shipped with a flimsy mount. This
mount would cheaply transform an optically decent 60mm into a fine performer. I
use it often with a 60mm f/16.7 refractor and a 60mm f/11.7 refractor. In fact, with either of the 60mm telescopes I have on the tripod, the combo makes the easiest to use system I have out of my half-dozen or so telescopes. Just point and look. No knobs to loosen and tighten, and no vibration.
With a resuscitated old 60mm Monolux, my pipe tripod, and my setting circles
I have hundreds of targets within my reach then can be located quickly, and
hundreds of dollars or more of savings in my pocket.