Visible imaging system with changeable field of view on the HL-2A tokamak. - Liu, L.; Yu, D. L.; Shi, Z. B.; Zhai, W. Y.; Wu, N.; Gao, J. M.; Huang, Z. H.; Xia, F.; He, X. X.; Wei, Y. L.; Zhang, N.; Chen, W. J.; et al. (Review of Scientific Instruments, 2022)