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Refracting
vs Reflecting
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Problems with refractors:
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large refracting lenses hard
to make: glass has to be good all the way through
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refracting elements must
be mounted from edges
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refracting telescopes have
to be long, since short focal length refractors are hard to make.
The largest telescope dome is for the largest refractor, not the largest
reflector
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chromatic aberration
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Problems with refractors:
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Spherical aberration--bad
focus
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Coma--off center is comet
or teardrop-shaped
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Largest telescopes are reflectors
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Yerkes
0.1 m (largest refractor) WI/Chicago
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WIYN
3.5 m Wisconsin's own in AZ
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Hale
5 m Mt Palomar, CA
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Keck
I & II 10 m, Mauna Kea, HI
Chromatic
Aberration
Spherical
Aberration
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