Fabry-Perot filter based solar video magnetograph S. K. Mathew, A. Bhatnagar, C. D. Prasad and A. Ambastha Astron. Astrophys. Suppl. Ser., 133 2 (1998) 285-292 Published online: 15 December 1998 DOI: 10.1051/aas:1998312