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Uses two lenses to concentrate the celestial objects. This delivers more light to the human eye. It is then refracted through a spherical lense forming an image.
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He may have been the first to see the belts on jupiter. He published a book describing how to use the refecting telescope.
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Had many issues with it. brighter objects tend to have colored circles around them. Also the images appeared more spherical than normal.
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The design has been improved. It was for a compund eyepiece.
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Has paraboloid primary mirror and ellipsoid primary mirror. The designs could not be finished till 10 years later.
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The first functioning reflecting telescope using a spherical primary mirror. Also a flat diagonal secondary mirror.
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