For that, I just use the location of the current (game) frame (I’m guessing it’s already one frame behind):
Good to see you found that. I don’t know if the camera compensation idea will fully work, though. It works for linear camera motion, but when the camera rotates, it still blurs. I think it’s because, since it’s rotation, the vectors are different for different points on the screen, which the compensation doesn’t take into account. Maybe it’s possible to?