Which innovative telescope design, introduced in the 1970s, dramatically disrupted the market by making large aperture instruments affordable to amateur astronomers?

The astronomy retail sector has evolved dramatically over the decades, with telescope design and marketing strategies changing to meet consumer demands. From traditional refractors to computerized GoTo mounts, manufacturers have innovated while developing unique selling propositions. This poll tests your knowledge about a significant product design decision that revolutionized amateur astronomy and changed the telescope market forever.

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Schmidt-Cassegrain Telescope (SCT)
Dobsonian Reflector
Maksutov-Cassegrain Telescope
Computerized GoTo Equatorial Mount