Which product innovation helped Celestron democratize astronomy in the 1970s, making sophisticated telescopes more accessible to amateur astronomers?

In the competitive world of astronomy equipment, product innovation and marketing strategies have played crucial roles in bringing the universe closer to amateur astronomers. This poll explores how Celestron, one of the most recognized telescope manufacturers, revolutionized the consumer astronomy market with a groundbreaking product innovation in the 1970s that changed how amateur astronomers view the night sky forever.

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The Schmidt-Cassegrain telescope design with mass-production techniques
The first computerized 'GoTo' telescope mount system
The introduction of apochromatic refractor technology
The patented StarBright XLT optical coatings