Which telescope technology innovation is credited with creating the biggest boom in amateur astronomy retail sales during the 1990s?

The astronomy retail market has evolved dramatically over the decades, with certain technological breakthroughs creating watershed moments for amateur astronomers and professionals alike. One particular product innovation revolutionized how telescopes were marketed and sold to consumers, dramatically increasing accessibility to the hobby. Test your knowledge of this pivotal moment in astronomy retail history!

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Computerized GoTo mounts with object databases
Apochromatic triplet refractors
Dobsonian reflector design
Digital eyepiece cameras