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The Group 70 Amateur Telescope Project - Livestream

Thirty years ago, a group of EAS telescope makers had the crazy idea of obtaining the 70 inch backup mirror blank originally cast for a very well known telescope here in California. It wasn’t just talk; they actually bought it and founded a California non profit called “Group 70”, and for several decades have quietly and patiently ground, polished and figured the glass. Now, the entire telescope is nearly complete.

Although not the first 70″ amateur effort to be attempted and completed, this telescope will be the first of its size to undergo optical grinding, polishing and professional fabrication. Like cathedral’s of old, it has become a multi-generational project whose structural completion is now in sight. Join David Barosso, Rich Ozer and EAS in a presentation about Group 70, a discussion of where the project stands, and some of the ideas for the future of this endeavor.

Speakers: Richard Ozer, East Bay Astronomical Soceity President; David Barosso, Group 70

This talk will be available live and publicly at:

Saturday, 11/20/21


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East Bay Astronomical Society

, CA