How wide is Panoramic? The answer is hard to come by. As soon as you start to get wider than 2:1, people start calling it panoramic.

Panavision is 2.35:1
A Hasselblad XPan shoots 2.71:1
And Kodak's APS format makes panoramic images at a full 3:1

Then there are the real panoramic guys who shoot 180 degree pictures, or even 360 degree pictures. You can get 4:1, 5:1, 6:1, etc, but you need to start taking multiple images and pasting them together, rotating the camera as the picture exposes, or use some kind or crazy mirror system to get pictures that wide.