Power to weight ratios

The Nikon F5 is a fairly heavy camera, so I began to wonder about the ratio of pixels to weight. Here are the results.  

Camera	Weight	Image size	MP / lb
Lumix LX7	10oz	10MP	16MP/lb
Mamiya RZ (110mm f2.8)	5lb 9oz1	26MP3	4.7MP/lb
Olympus OM2-SP (50mm f1.4)	1lb 15oz	8MP4	3.5MP/lb
Cambo 45SR (180mm f5.6)	24lb2	52MP5	2.2MP/lb
Nikon F5 (24-85mm f4.5)	4lb 6oz	8MP4	1.5MP/lb

1 - Includes the LX7 in lieu of a light meter. Does not include tripod.
2 - Includes tripod, but not case or extra film.
3 - Scanned at 2000dpi.
4 - Scanned at 3200dpi.
5 - Scanned at 1800dpi.

So it turns out that the Nikon has the lowest power to weight ratio, lower than the Cambo SR! The Mamiya does well (though with a tripod it comes out no better than the Olympus).