National Geographic 80-30124 Manual De Instrucciones página 9

Types Of Telescopes:
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Reflector
A reflector telescope uses mirrors to gather and focus light. Light enters the telescope through its open front
end and travels to the concave primary mirror at the back. From there the light is reflected back up the tube to
a flat secondary mirror, which sits at a 45° angle in relation to the eyepiece. Light bounces off of this secondary
mirror and out through the eyepiece. A reflector's views will be upside down therefore it should only be used for
astronomical observing because "up" and "down" are irrelevant in space.
Light
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Light
Light
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Objective Lens
Light
Light
Light
Refractor
A refracting telescope uses a collection of lenses to gather and focus light. A refractor's views will be upside
down if a diagonal is not in use. A standard diagonal will generate a "right side up" image, however, it will rotate the
image on the vertical axis (mirror image). To get the "right side up" image without the rotation, you will need to use
a special diagonal with an erect image prism.
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Cassegrain)
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Cassegrain)
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ssegrain/
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Light
Catadioptric
A catadioptric telescope uses a combination of mirrors and lenses to gather and focus light. Popular catadioptric
designs include the Maksutov-Cassegrain and Schmidt-Cassegrain.
Focuser
Light
Focuser
Light
Secondary Mirror
Focuser
Light
Secondary Mirror
Light
Light
Secondary Mirror
Light
Objective Lens
Objective Lens
Correcting Lens
Light
Correcting Lens
Light
Secondary Mirror
Correcting Lens
Light
Secondary Mirror
Light
Secondary Mirror
Focuser
Focuser
Focuser
Primary Mirror (Objective)
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Primary Mirror
(Objective)
Primary Mirror
(Objective)
Primary Mirror
(Objective)
Primary Mirror (Objective)
Primary Mirror (Objective)
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