Which telescope design innovation dramatically reduced weight and manufacturing costs while maintaining optical quality, leading to the modern amateur astronomy boom in the 1970s-80s?

How well do you know the evolution of telescope design? This poll explores how product design innovations have revolutionized our ability to observe the cosmos. From ancient optical instruments to modern space-based observatories, telescope design represents one of humanity's most important product development journeys, continuously improving our window to the universe.

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The Dobsonian mount, which replaced expensive equatorial mounts with a simple alt-azimuth design
The Schmidt-Cassegrain catadioptric design, combining mirrors and lenses in a compact tube
The Newtonian reflector with mass-produced parabolic mirrors
The revolutionary Celestron C8 with injection-molded corrector plates and mass-produced mirrors