masochistic? I would prefer a manual focus lens for panning. Pre-focus at your chosen point then just follow the subject with the camera, hitting the button as you reach your pre-focus point. The bigger problem panning with a nex (3 or 5 not 7 or 5-with-viewfinder) is viewing the subject on the screen as you move the camera, much easier with a viewfinder and the camera against your face. i have a 3 and i found it a bit arkward at Silverstone this summer.