Amateur Telescope Making (ATM) : the mirror
Figure: Parabolic shape eliminates spherical aberration
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Telescope
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DK LABORATORIES
Optic Wave Labs 6 Inch F/6 Parabolic Telescope Primary Mirror Set ...
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Amateur Telescope Making
Parabolic reflector - Wikiwand
Figure: Newtonian reflecting telescope
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Cassegrain reflector - Wikipedia
Cassegrain reflector - Wikipedia
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Ronchigrams for a primary mirror of a Newtonian telescope ...
Off-Axis Parabolic Mirror - Others - Claser Photonics, Inc
