What is the difference between an ancient optical telescope and a modern one?

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Hajra Zaheer

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Hajra Zaheer asked the Naked Scientists:
   
Apart from age, what is the difference between an ancient optical telescope and a modern one?

What do you think?
« Last Edit: 27/11/2010 14:30:03 by _system »

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Offline Pikaia

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The first telescopes were obviously of inferior quality, and had simple lenses instead of doublets which reduce chromatic abberation. They also had a concave eyepiece (like opera glasses) which give an erect image, while modern telescopes usually have convex eyepieces and an inverted image.
Nowadays people tend to use binoculars for terrestrial use as they are more compact and give an erect image.

The first telescopes were all refractors until Newton invented the reflecting telescope/