Film is Kodak Porta 160, Camera Fuji GW690III, Tripod with cable release. The frames in question were shot at higher exposures and I am guessing that the frames with the streaks were between 8-16 seconds, maybe 4-8. I didn't record the frame/exposure information. Other frames on the same roll with shorter exposures did not streak. I doubled my metered exposure after reading a test on Porta 160 and the need to at least double the exposure after 1 second. Any thought on why the highlights have streaks?