Deck Lift Mechanism
Counterweights used to lift the deck around the great refractor.
Date: June 25, 2011
Location: Lick Observatory, Mt. Hamilton (4200’), California
Optics: Canon EF 17-40mm f/4L USM
Camera: Canon EOS 7D
Exposure: One single light frame of 1/4 second, f/4, ISO 3200