Well then, the Sigma Art series of lenses and some of their other lenses will do fine as a replacement of tamron, since all I would need to do would be to use in body stabilization for the prime lenses and optical stabilization for the zoom lenses. Good, so now there would be less worrying about messing up with certain movements and I can still get good auto-focus. Now, the amount of takes would be less and so there would be a great film made in less time with less stress placed on the actors.