I am interested in utilizing the THX Optimode TV calibration i've seen on some recent dvd's and I'm wondering what type of blue filter specifically I should be using. Is it the same type of blue filter that comes with Video Essentials? Someone told me the Kodak filter # but have ben unable to track down the # (or the post - the search function is down). I have a FULL set of Rosco filters from 1995 and I would assume that I have the corresponding filter, but have no idea which one to use. Calibrating with the wrong one would be a bad idea. Does anyone know anything about using Rosco filters for colorbar/THX calibration? thanks!