It is possible to record video with one camera and capture time-lapse photos with the other camera in the in the 3D camera housing, but not with the 3D Sync Cable inserted. The 3D Sync Cable will only assist with synced 3D recording when modes are identical between cameras. If you would like to use the 3D housing for dual recording you can simply neglect the 3D Sync Cable and start recording before inserting the cameras into the housing. Make sure to place the camera that is upside down in Upside-down mode before recording.