Which telescope design innovation created the biggest surge in consumer telescope sales during the early 2000s?

The consumer telescope market has transformed astronomy from an exclusively professional pursuit to a popular hobby. This trivia question explores how product design innovations have influenced amateur astronomy and created a thriving consumer segment. From department store telescopes to advanced computerized models, the evolution of these products reflects changing consumer demands and technological capabilities.

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Computerized GoTo mounts that automatically locate celestial objects
Dobsonian reflector telescopes with simplified mounts and larger apertures
Smartphone telescope adapters for astrophotography
Portable refractor telescopes with carbon fiber tubes