But if the lens is the same, meaning the same physical lens at same focal length, how do you get the same framing with different size sensors? In some cases you can change the distance, but if everything is not on a flat plane then the playing field is no longer level. IF - your subject is a flat plane (perpendicular to the lens axis) then you can change distance to match the framing, and expect both 16 megapixel sensors to record the same amount of subject detail. Assuming, as before, that neither the lens nor the AA filter is the limiting factor. I mention the lens limitation to rule out the use of a very small physical aperture, in which case the smaller sensor's image would be degraded more.