Perhaps this will help explain full-frame v. crop sensors a bit

[480sparky37 37]

Maybe this will help clear up some of the confusion about field-of-view and "35mm equivalent" when comparing full-frame cameras and those with crop-sensors.

Regardless of the 'comparison', a 50mm lens is a 50mm lens, no matter which sensor you're using. What changes is the apparent field of view between the two. So if you were to take a full-frame and a crop-sensor camera, set them up side-by-side with, say, 50mm lenses on both, and looked through the viewfinders of them, this is what you would see:

Neither camera-lens combination 'enlarges' or 'reduces' the apparent size of the subject. The bridge and the flowers are the exact same size in both VFs. What is different is the size of the focus screens, which is in direct proportion to the size of the respective sensors. This, in turn, changes the field of view (measured in degrees).