Thanks, but that’s not the camera I saw. In fact, it didn’t have two lenses (at least not visible).
Yeah, there are a number of different designs. Some use mirrors.
I was watching the recent X Games on standard HD and you could see cameramen carrying around some pretty light-weight 3D cameras with stereo lenses. I’m pretty sure that ESPN was broadcasting the X Games in 3D. The cameras there were even lighter than the one in the image that I posted.