Which revolutionary product innovation helped Celestron become a market leader in consumer telescopes during the 1970s?

Since the early days of consumer telescopes, a few key brands have shaped how amateur astronomers observe the night sky. This poll tests your knowledge of Celestron, one of the most influential telescope manufacturers in history, and how its product innovation changed backyard astronomy forever. Do you know which breakthrough technology transformed this company from a small optics shop into a global leader?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

The Schmidt-Cassegrain optical design that allowed for compact, portable telescopes with long focal lengths
The first computerized 'GoTo' mount system that automatically located celestial objects
The introduction of apochromatic refractor telescopes at consumer-friendly prices
The development of the first mass-market Dobsonian telescopes with simplified operation