Re: Newtonian mirror > 10" where available?
- From: Quadibloc <jsavard@xxxxxxxxx>
- Date: Sat, 03 Nov 2007 20:11:15 -0700
Tenifer wrote:
Gee. I thought newtonians are the least expensive. Well.
A 12.5" mirror is selling for average of $1300 and without
other parts. So it seems a Celestron 9.25" at $1350 OTA
complete may be a more sensical choice. Isn't it. Or
maybe the meade 7" is more sensical. Do you know
what happens to the Meade 7" maksutov and what
other equivalents are out there?
Well, there are different kinds of telescope, and they depend on what
type of observing you want to do.
A Dobsonian - a Newtonian in a simple type of altazimuth mount - is
the least expensive type of telescope for its aperture. It is used
mostly by people who can often drive out to a dark-sky site in the
country for looking at galaxies and nebulas (nebulae).
Of course, with a smaller aperture, a more expensive type of telescope
can still be cheaper!
A Celestron 9.25" is an excellent choice for a telescope, since it is
larger than 8" - for viewing the planets, anything smaller than 8" is
a bit on the small side, but 8" is enough to make Mars and Saturn, not
just Jupiter, look satisfying (still small, of course, to photos taken
from space, though). 10", 14", or better yet, 17", or even 24"...
well, when it comes to looking at distant nebulae and galaxies, deep-
sky objects, aperture (and dark skies) are the thing. This is the part
of the hobby that gave us the phrase "aperture fever".
The advantage of the Schmidt-Cassegrain is how portable and convenient
it is.
Getting an OTA, though, means you have to put it on a mounting
yourself. What type of mounting do you plan to use?
My web site, starting from
http://www.quadibloc.com/science/opt01.htm
may provide a bit of an introduction. There are many other sources of
basic information about amateur astronomy and optics.
John Savard
.
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- From: Tenifer
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