1 Research and development of a spectroscopic survey telescope and its astronomical achievements in China

3 Discussions of the S-ADC

4 Discussion of some important issues and an example design for a 12-m aperture telescope with an FOV of 1.5°

5 12-m four-mirror Nasmyth system I (or II) with an FOV of 2°

6 12-m four-mirror Nasmyth system II with an FOV of 2.5°

7 Discussion and conclusions