The Subaru Telescope . ... The gray building housing Subaru is visible just left of the white Keck domes near the photo's center. Subaru is the latest in the class of optical telescopes using a mirror with a diameter greater than 8 meters. Subaru's 8.3-meter primary is the largest single-piece optical telescope mirror yet made , and is so thin that its precise shape can be monitored and adjusted. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...