Which telescope design innovation, first mass-marketed in the 1970s, revolutionized amateur astronomy by replacing the traditional tube design with a more portable retail product?

The astronomy retail sector has seen remarkable innovation in telescope design and marketing over the decades. Major brands have competed to create telescopes that balance optical performance, portability, and user-friendly features. This poll tests your knowledge about a significant product design decision that changed the consumer telescope market and made astronomy more accessible to amateur stargazers worldwide.

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Dobsonian mount telescopes (with simplified alt-azimuth mounting)
Digital Go-To computerized telescopes
Schmidt-Cassegrain compact catadioptric design
Apochromatic refractor triplet lens system