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Synoptic Monolith, I

Grinding the combined primary and tertiary mirrors (M1M3 monolith) of the Large Synoptic Survey Telescope

Taken Friday, February 14, 2014, 11:51:43AM. Original image size: 2592x3888, 1.3Mb
Technical details: Canon EOS 40D, 1/125s@ F4, ISO 800, 50mm f/1.4 (80mm equiv)
PS CS5 3500:15, Exp1.5 CVS 40:40:10, LS25, Profile, USM 30:5