Moves the filter wheel in front of the TV camera to a named filter.
2=to: 2!:}Format: TVFILT <filtername>
2=to: 2!:}Example: TVFILT R
2=to: 2!:}Comments: Possible values are: B; V; R; CLEAR and EMPTY. The TV focus must be adjusted when changing from EMPTY to one of the other positions. Note that there may be an opaque mask in position EMPTY; if so position CLEAR should be used instead.