Yes, it’s the footage. Right now i’m tracking portion of the fooatge (not the light source itself as it’s being obstructed from time to time) and apply the motion to the null, then i add the lens flare to the source footage but add that expression you told me about. So the flare gets it’s position from the null… Now if only i knew how to offset the null so that the light was not coming from where i was tracking the footage but from the actuall light source…