Sets the TV scale.
2=to: 2!:}Format: TVSCALE <tvscalevalue>
2=to: 2!:}Example: TVSCALE 5
2=to: 2!:}Comments: Puts the correct focal reduction optics (or no optics at all) in front of the TV camera for a specified scale (in arcsec/mm), either in slit viewing or direct mode. Allowed values of the TV scale are 5 and 12.