[Utah-astronomy] solar filter

Anyone have thoughts about advantages/disadvantages of using a full-aperture filter versus an off-axis filter on a SCT? I'm trying to decide whether to purchase or make a full-aperture filter. If I purchase a sheet of film and make an off-axis filter I'll have enough film left over for one or two pairs of binoculars. I'm always for saving a buck or two - or 25 or 30 (for another piece of film). Kim