I have experimented a little bit more and I think it is a problem with the NX lens 16-50 S (f2-2.8) and the UHD 30P of the NX1. If I record the video: NTSC, UHD 30P, Pro quality, manual focus (switch on the lens on MF), OIS (switch off on the lens) while looking in the viewfinder during recording the image is shaky and weird when I am at 16mm on the zoom everything is fine however when I use the zoom an I am between 24 mm and 50mm the bug appears!!