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TELESCOPES
TELESCOPE GLOSSARY
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1
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2 Basic Types
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REFRACTORS
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These are the most popular telescope for beginners. They use a lens to gather and focus
the light of the object it's pointing at. Using a lens which is made
from two elements or more,
the refractor reduces false colours.
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HOME PAGE
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There are two different types - the
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achromatic
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or
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apochromatic.
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INDEX
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Basic features of refractors include:
PROS;
- small and compact
- maintenance free
- high resolution (excellent planet scopes)
- Can be used during the day for terrestrial viewing without the image being upside
down
CONS;
- expensive for larger models and apochromatic
- less light gathering power than reflecting telescopes because of their smaller size
- Awkward to use when pointing straight up (straight up is the best place to view with
a telescope)
- false colour especially in larger models
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TELESCOPE LINKS:
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Mounts
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Light Gathering Power
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Closer Look At Refractors
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Closer Look At Reflectors
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Dimensions
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Balancing
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Eyepieces
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Cleaning Optics
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Tips
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REFLECTORS
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Astrophotography
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Build your own telescope
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Reflectors gather light using a mirror which is curved. The curved mirror concentrates
the light and is then magnified by an eyepiece. Newtonian
reflectors (invented by Sir Issac
Newton) can be identified by the eyepiece protruding from the side of the telescope. These
are the most common and cheapest to
buy. Other types of reflectors incorporate a front
lens which corrects the incoming light first before hitting the main reflective mirror. These
front
lenses are called corrector plates and the different types used determine the type
of reflecting telescope. The more popular types are the
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Build your own telescope
for schools
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Binoculars
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Schmidt-Cassegrain
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and the
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Maksutov-Cassegrain.
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just
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To find out more about each type of telescope, including
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Newtonians,
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click on their name. To find out the pros and cons of reflectors, please go to the next page.
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HOME PAGE
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INDEX
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Contact Us - telescopes@adam.com.au
Australian Residents Please Call (08) 8381 3188
International Residents Please Call 61+ 8 8381 3188
Australian Fax Orders (08) 8381 3588
International Fax Orders 61+ 8 8381 3588
UPDATED 22nd August 2007
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