A wide-field twin-mirror telescope of unusual design, opened in 2009 at the Xinglong Observatory, China. It consists of a fixed primary mirror on a tower and a movable secondary mirror in a dome. The secondary tracks celestial objects near the meridian. Light from the secondary is reflected upwards onto the primary, which then directs it onto the focal surface in a lower tower. Adjustable optical fibres on the focal surface feed light into spectrographs, allowing up to 4000 objects to be observed at a time over a field of view 5° wide. The primary mirror measures 6.67 m × 6.05 m and consists of 37 hexagonal segments 1.1 m wide. The secondary mirror is 5.72 m × 4.40 m in size and consists of 24 hexagonal segments, each 1.1 m wide. The secondary has active optics which acts like a correcting plate on a Schmidt telescope, so the design is termed a reflecting Schmidt.

http://www.lamost.org/public/instrument?locale=en Official telescope web site.