Which CEO revolutionized the telescope market in the 1970s by introducing the Dobsonian mount design, dramatically reducing costs and making large aperture telescopes accessible to amateur astronomers?

The telescope industry has seen dramatic transformations since Galileo first pointed a primitive spyglass at the stars. Today's astronomy market features sophisticated players competing for both professional and amateur stargazers. This poll tests your knowledge about one of the most significant product developments in modern astronomical equipment manufacturing that changed how amateur astronomers access the night sky.

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John Dobson of San Francisco Sidewalk Astronomers
Alvan Clark of Alvan Clark & Sons
Roland Christen of Astro-Physics
Thomas Back of Tele Vue Optics