The red cellophane that Tony was using seemed to work well, I dont think it would work well for trying to focus properly for planetry work though.
It was more the angle of the laptop screens that was the problem where Bird and Marcus were setup I think. There was noone behind them at all (other than John to the west [I think it was, though my bearings were stuffed
]). Most of the imagers were in one location (hi Houghy).