The resolution in the scene is dependent on the pixel pitch times the magnification. However, since the row pitch and the column pitch are different, this will correspond to a different magnification in the XY plane. Care must be exercised in selecting the dominant pitch.
PERCENT OF MAGNIFICATION CHANGE PER IMAGE AXIS = (Z/S') * 100
As the scene moves towards the camera, each scene axis gets bigger. As the scene moves away from the camera, each scene axis gets smaller. This equation relates the total Z axis motion (to and away motion of the scene as related to the camera) to on edge change providing the scene is still in focus.