Difference between G and E-type lenses is that 'E' stands for Electromagnetic Diaphrapham.
The G type lenses have an aperture tab for diaphrapham control as dictated by the camera body, the E-type lenses leave this to being controlled by the camera electronically.
The G type lenses have an aperture tab for diaphrapham control as dictated by the camera body, the E-type lenses leave this to being controlled by the camera electronically.