Which innovative product design feature did Celestron introduce in 1970 that revolutionized amateur astronomy and became their signature marketing advantage?

In the competitive world of consumer astronomy, product design and marketing have played crucial roles in making stargazing accessible to everyday consumers. The 1970s saw a dramatic shift in telescope design and retail strategy that forever changed the industry. Test your knowledge of this pivotal moment in astronomy retail history!

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Schmidt-Cassegrain compact telescope design that made powerful telescopes portable for the first time
First computerized star-finding system called SkyAlign
Unbreakable carbon fiber telescope tubes with lifetime warranty
Subscription-based 'Celestron Club' with monthly astronomy targets and exclusive accessories