The Perfect Telescope! (Well, almost...)

I saw a dob at the 2001 RTMC that had the main mirror in a box and the
secondary was on a single rod that held it mounted about 6ft in front of the
main mirror and the eyepiece was on a small mount to it's side. A One Beam
truss.


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"John Savard" wrote in message
...
Finally, on my web page, at

http://home.ecn.ab.ca/~jsavard/science/opt03.htm

which is my page on telescope mountings, I give a description of a
telescope design I had thought of some time ago.

My goal was to minimize the expenditure on optical components, allowing
one to purchase common, standard parts, and to produce a telescope that
could be mounted on an equatorial fork mount.

Thus, the telescope should effectively have a short, stubby tube, like a
Schmidt-Cassegrain, with the eyepiece close to the primary mirror and
the center of gravity of the telescope.

But I wanted high optical quality - and thus a small central obstruction
for maximum contrast.

To build it from standard parts, easily available off the shelf from
suppliers meant the design couldn't be too exotic...

the resulting telescope has just two flaws.

The secondary mirror is mounted a great distance from the primary, and
has to be held by a very lightweight framework. This may be asking too
much of even the Serrurier truss.

And, for a 10" telescope, with one typical set of parameters, a 40mm
eyepiece - about the lowest power 1 1/4" barrel eyepiece one can get -
yields 400x magnification, or 40x per inch. A 25mm eyepiece yields 640x,
already over the limit. So the telescope is only good for one thing,
observing near the limit of possible magnification!

John Savard
http://home.ecn.ab.ca/~jsavard/index.html


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John Savard wrote:

http://home.ecn.ab.ca/~jsavard/science/opt03.htm

That's a very nice page. Lots of interesting info.

What are you using to create your graphics?
They are especially clear.