I've tested several Wegas and none of them show a uniformly covered grey field (easiest seen at 100 IRE level). The screen shows splotches of discoloration (i.e purple - green) in what is supposed to be a uniform field. The sets often also show a semi-circular darker pattern on the left and right sides. Does anyone know what causes this? When watching a program white or light blue screens especially show bad color uniformity. Can this be fixed? The convergence is pretty good on the sets so it isn't that. Any help would be appreciated. Thanks a lot.