Which of these telescope product innovations was developed first by Celestron in the 1970s and revolutionized amateur astronomy by making telescopes more affordable and accessible?

The telescope market has evolved dramatically over the centuries, with certain product development innovations changing how we view the cosmos forever. Test your knowledge about pivotal moments in astronomy product development that revolutionized both amateur stargazing and professional research. Which companies pioneered key technologies, and how did their innovations reshape our understanding of the universe?

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Schmidt-Cassegrain telescopes with mass-produced corrector plates
Computerized GoTo mounts with GPS alignment
Apochromatic refractor lenses using ED (Extra-low Dispersion) glass
CMOS-based digital astronomy cameras replacing traditional CCDs