Which telescope design innovation, first mass-marketed in the 1970s, dramatically reduced costs and size while maintaining quality, leading to the democratization of amateur astronomy?

Modern astronomy has been transformed by continuous innovations in telescope technology. From the basic refractors of the 17th century to today's adaptive optics systems and space-based observatories, product development in astronomy equipment has pushed the boundaries of what we can see in the cosmos. This poll tests your knowledge about a significant product development milestone that revolutionized amateur astronomy and created a new market segment.

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Schmidt-Cassegrain compact telescopes
Digital eyepieces with smartphone connectivity
Computerized GoTo mount systems
Apochromatic refractor lenses