Which revolutionary product design innovation, introduced by Celestron in the early 1970s, made advanced astronomical viewing more accessible to amateur astronomers?

The telescope market has evolved dramatically over the decades, with technological innovations changing how amateur astronomers access the night sky. Major manufacturers have employed various strategies to differentiate their products in this competitive space. This poll tests your knowledge of a significant retail innovation that transformed the amateur astronomy market in the early 1970s.

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The Schmidt-Cassegrain C8 telescope, which combined powerful optics in a compact, portable design at a relatively affordable price point
The Digital Sky Survey software package, which automated star location and tracking for beginners
The Astro-Vision subscription model, where consumers could rent premium equipment on a monthly basis
The Multi-Spectrum Filter System, which allowed telescopes to switch between visible light, infrared, and ultraviolet viewing