imovie shimmer

I recently purchased a 15" macbook pro with retina display. When I import a video clip from my Sony HDR-HC9 camcorder into imovie 11, the picture shimmers. I viewed the clip directly on a TV monitor and the quality was fine. Also I did not have this problem when using this camcorder on my previous 17" macbook pro. I am connecting the camcorder to the computor using the camcorder's firewire 400 cable together with a 400 to 800 converter plus a 800 to thunderbolt converter.

Editing videos is my primary application. Can anyone help.