Which revolutionary telescope product, launched in 1970, used a unique optical design that eliminated chromatic aberration and became the best-selling telescope model of all time?

The astronomy product market has seen numerous innovations over the centuries, but certain product launches have fundamentally transformed how we observe the cosmos and sparked entire industries. This poll tests your knowledge about one of the most significant commercial breakthroughs in astronomical observation equipment that revolutionized the consumer telescope market and made stargazing accessible to millions of amateur astronomers worldwide.

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Celestron C8 Schmidt-Cassegrain
Meade ETX Maksutov-Cassegrain
Questar 3.5 Maksutov
Dobsonian Reflector by Coulter Optical