Which retail strategy revolutionized the consumer telescope market in the 1970s, dramatically expanding amateur astronomy's accessibility?

The astronomy retail landscape has undergone dramatic changes over the decades. Consumer telescope purchasing patterns reveal fascinating insights about how astronomical discovery has been commercialized and made accessible to different markets. This trivia question explores a pivotal moment in astronomy retail history that transformed how consumers interact with the night sky.

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Introduction of Schmidt-Cassegrain compound telescopes that were more compact and portable than previous designs
Implementation of mail-order astronomy catalogs with installment payment plans
Development of telescope rental programs through public observatories and science centers
Creation of subscription-based astronomy equipment clubs with quarterly equipment upgrades