So... You Want to Buy a TelescopeRick Schrantz, rnschrantz@msn.com
Quite frequently, club members are asked "What telescope should I
buy"? Generally, people who ask us this question are in the market
for a beginner's telescope for themselves or a child. They want
to know how much money they should spend, and if the "600 power"
model they saw at K-Mart is a good deal. First of all, there are
some points to consider before choosing a telescope. Don't be in
a hurry. The universe will wait for you!
1. First, start to familiarize yourself with the sky. Using a
star map, learn to recognize some constellations, and learn a little
bit about different types of objects in the sky (such as galaxies
and planets). Be able to recognize and point out various planets
if they are visible (such as Venus, Mars, Jupiter, and Saturn).
From a dark sky, look for meteors and satellites. You can see a
lot with the naked eye.
2. If you have binoculars, use them too. You can see a lot more
in the sky with them. Even a pair of cheap 10X50's will show a
wealth of objects.
3. Attend a local "star party". The BGAAC has free monthly
observing sessions at Raven Run Nature Sanctuary
(in S.E. Fayette
County, KY). They are held from March through November (weather
permitting). You will see a 15 minute slideshow about a particular
astronomy subject, and then be able to look through several different
kinds and sizes of telescope when it gets dark enough. Anywhere
from 30 to as many as 150 people attend these events. Contact
Raven Run (859 272-6105) for details.
4. Pick up a couple of astronomy magazines and flip through the
advertisemants. These will show many different types of telescopes
available. Two good magazines are
Sky and Telescope and
Astronomy.
5. Our recommendation for a beginner's telescope is a 6-inch f/8
Dobsonian reflector type (or even an 8-inch f/6). These types of
telescopes are available from
Meade,
Orion, and
Celestron, and cost
about $300 to $500 (all mail order). However, these telescopes
are not perfect. They must be optically aligned when they arrive,
and they can be modified by the owner to produce smoother motions.
You must have some accessories with these telescopes to make them
most useful. Some of these scopes come with the accessories standard
or as a low-cost option. The accessories you need:
a. A zero power finder such as a Telrad or Rigel Quick-Point -
Pointing a telescope is not a trivial matter. The small finders
that come with them are usually not very useful.
b. At least two reasonably good quality eyepieces (a low power 25
to 32 mm, and a higher power 8 to 12 mm) - The Plossl design is
very popular and competitive. Meade, Orion, and Celestron offer
inexpensive Plossl eyepieces.
c. Some sort of star chart - After looking at the moon and bright planets,
finding things in the sky can be a challenge.
6. If you are at all mechanically inclined, you can build your
own telescope. It is not too hard, but it does take time and
planning. You will not save money over a commercial telescope,
but you will have an instrument that works better, provides better
images, and is customized for your needs. The only tools required
are: a radial-arm or table saw, a power screwdriver, a router with
a radius arm for cutting circles and curves, an electric drill with
bits, and a hole saw. You will be working with fine plywood (such
as Russian Baltic Birch) for strength, a cardboard tube meant for
pouring concrete pillars, and kitchen counter-top laminate. You
will have to purchase a primary and secondary mirror, a focuser,
a spider vane, and a mirror holder. If you are truly interested,
one of our members will help guide you. It is also possible to make
the primary mirror yourself: please see our section
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