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How
to Buy a Telescope
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Two Dobsonian telescopes.
The tube of a Dobsonian telescope is easily removed
from its base, making for easy transport.
Credit: NASA |
While there are several types of telescopes,
most beginners would do well to purchase what is called
a "Dobsonian" telescope. Dobsonian telescopes
(or "Dobs") are relatively low-cost, yet high-quality
telescopes. Generally speaking, they do not have any
high-tech, computerized gadgets on them. Yet their optics
are just as good as the overwhelming majority of computerized
telescopes that cost thousands of dollars. Once you
gain some experience using a Dob — and should
you decide to make astronomy into a serious hobby —
you might eventually purchase a more expensive "Schmidt-Cassegrain"
or "apochromatic refracting telescope." But
start with a Dob!
Astronomers compare telescopes primarily
by the diameter of their main ("primary")
mirrors. This is referred to as the "aperture"
of the telescope. You'll want to get a Dob with an aperture
of either:
- 6 inches (150 mm)
- 8 inches (203 mm)
- 10 inches (254 mm)
If you can afford it, I'd recommend either
an 8 or 10 inch version: The larger the diameter of
the mirror, the easier it is for you to see dim objects
(like stars) in the night sky. Prices range from roughly
$230 USD for 6-inch apertures to $500 USD for 10-inch
apertures. The telescope should come with two or three
eyepieces. If it doesn't, shop somewhere else.
Whatever you do, don't buy a telescope
from a department store. Instead, either buy from a
store that specializes in telescopes, or buy online.
Good brand names include Antares, Orion, Celestron,
and Meade.
Also, consider purchasing the following
accessories:
These tools will help you learn the constellations
(areas of the night sky), and otherwise help you get
started in astronomy. Also, consider joining a
local astronomy club where you can gain experience
using various types of telescopes before making a purchasing
decision.
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