Hi Olof, Yes, I can’t get the lens to zoom smoothly, its stutters on and off if you are trying to do a slow zoom, I thought buying a zoom controller would fix the problem, however, most of the manufacturers are making very basic controllers now and it made no difference to the zoom in fact the Manfrotto 521EX made things even worse, it jumps on start up and then starts and stop through the zoom range whist trying a slow zoom… therefore, I believe it must be the Fujinon lens that’s the issue.