Hector Javkin , Feb 27, 2012; 12:35 a.m.
They would probably also benefit if the world stopped turning to prevent vibration too.
The turning of the earth produces no vibration of interest for ordinary, earthbound photography. I think that the logic about the D800 requiring a tripod is (1) that it seems silly to use a camera capable of great detail and not make use of it and (2) that if you examine your D800 images at 100% , you'll see more pixels affected by not using a tripod than if you had used a D50.
Of course the effect of the vibration will be the same with either camera.