Which product design innovation in the 1970s significantly reduced the cost and complexity of large astronomical telescopes while maintaining optical quality?

Modern telescopes represent centuries of product design innovation. From Galileo's simple tube with lenses to today's sophisticated observatories, telescope design has continuously evolved to meet astronomers' needs. This poll tests your knowledge of a pivotal design decision that revolutionized astronomical observation capabilities in the 20th century, making deep space exploration more accessible to both professional and amateur astronomers.

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The Ritchey-Chrétien reflector design that eliminated spherical aberration
The introduction of computerized star tracking and positioning systems
The Dobsonian mount, which simplified telescope movement and reduced manufacturing costs
The development of apochromatic lens systems that reduced chromatic aberration