Which innovative telescope design, first commercially produced in the 1970s, revolutionized amateur astronomy by eliminating chromatic aberration without requiring extremely long tubes?

The telescope revolutionized astronomy and our understanding of the cosmos. Over centuries, innovative product designs have transformed these instruments from simple spyglasses to sophisticated tools that reveal the universe's deepest secrets. This poll tests your knowledge about a pivotal innovation in telescope design that changed astronomical research forever and opened new frontiers in retail astronomy products.

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Schmidt-Cassegrain telescope (SCT)
Dobsonian reflector
Maksutov-Cassegrain telescope
Apochromatic refractor