Which telescope design innovation revolutionized amateur astronomy by eliminating chromatic aberration while maintaining a compact form factor?

The evolution of telescope design has transformed our ability to observe the cosmos. Major innovations in product design have made astronomy more accessible while dramatically improving the quality of observation. This trivia question tests your knowledge about a pivotal product design breakthrough that revolutionized amateur astronomy in recent decades.

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The Schmidt-Cassegrain catadioptric design
The Dobsonian reflector mount system
The computerized Go-To positioning technology
The apochromatic refractor lens system