Which innovative pricing strategy did Celestron use in 1970 that revolutionized the telescope market and made amateur astronomy more accessible?

In the vast universe of astronomy retail and education, certain marketing strategies have achieved stellar success. This poll tests your knowledge of how one of astronomy's most revolutionary products was successfully brought to market through a groundbreaking pricing strategy that changed how consumers view the cosmos. Can you identify the approach that made stargazing accessible to millions?

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The C8 Schmidt-Cassegrain 'subscription model' - paying monthly for telescope upgrades
The 'loss leader' approach - selling the C8 telescope at near manufacturing cost while profiting from accessories
The 'observatory partnership' - splitting costs between customers who shared telescope time
The 'astronomical rebate program' - offering cash back based on documented celestial discoveries