A special reflecting Schmidt telescope is used to observe celestial objects. The telescope has an aperture of 4m, f ratio of 5, and a 5° field of view. Its optical axis is fixed and tilted 25° to the horizontal that runs from south to north. The celestial objects were observed for 1.5 h as they passed through the meridian. The shape of the reflecting Schmidt plate has to be changed with each different declination δ and in the tracking process. This is achieved with active optics. The sky area to be observed is −10° ≤ δ ≤ +90°. There are plans to place ~4000 optical fibers on the telescope focal surface that will lead to a dozen spectrographs.
© 1996 Optical Society of America
Shou-guan Wang, Ding-qiang Su, Yao-quan Chu, Xiangqun Cui, and Ya-nan Wang, "Special configuration of a very large Schmidt telescope for extensive astronomical spectroscopic observation," Appl. Opt. 35, 5155-5161 (1996)