Doug Neill, Don Sweeney, and Bill Gressler (L-R) stand in front of the LSST Primary mirror blank positioned on its side in the turn-over fixture after the casting material was removed and the glass readied for polishing of the back surface.
Sidney Wolff, John Schaefer, and Don Sweeney watch the lid lifted from the oven to unveil the LSST primary/tertiary mirror blank. UA Steward Observatory Mirror Lab, Tucson, AZ.