I'd like to use my Nex-7(12 oz.) with my Nikon 85 F/1.4G(21 oz.) with a tripod. The huge weight imbalance would seem to put a lot of stress on the camera's lens mount unless a lens collar is used. Anyone mount a heavy lens on the Nex-5 using a tripod? Did you use a lens collar or just connect the tripod directly to the camera base? How did it work out?