Which product design innovation by Celestron in the late 1970s revolutionized amateur astronomy by making telescopes more accessible to the general public?

The astronomy retail market has undergone significant transformation in recent decades, with certain brands dominating consumer telescope sales. Brand recognition and product design have played crucial roles in shaping amateur astronomy. This poll tests your knowledge of the pivotal product design innovation that revolutionized the telescope market for amateur astronomers in the 1970s-80s and changed how telescopes were marketed to everyday sky watchers.

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The Schmidt-Cassegrain telescope design that created compact, portable instruments with long focal lengths
The first computerized 'Go-To' telescope mount that automatically found celestial objects
The introduction of plastic optical components that dramatically reduced manufacturing costs
The development of the first smartphone-compatible telescope control system