Kirill Nersesyan

Hi all. I need an advice. I am planning a TV drama soon as a DOP. On the last work I had trouble with the lens my producers provided (it was a Broadcast TV Fujinon Zoom Lens). It had a horrible zoom effect (sorry if I am using a wrong term - I am Russian). Anyway anyt ime I would change the focus the lens would have a visible zoom effect. Which looked horrible of course. Could you advise on a lens ? Have you had an experience like mine ? I am planning to use 900 Sony HD CineAlta camera.