Well, it's not strictly a Non-E TC, but you'll see where I'm going.... OK, Left Field question.. shades of fridge door light scenario! Does the aperture actuator lever actually move when you've fitted (and fired) an E lens to a D500? Reason I ask is that I put the (non-E) TC 1.4 II between the E only nikon 200-500mm and my D500. Occasionally, like twice in 20 frames, it made a very worrying metallic ping/clang like the lever slipped off something or over-ran it. The lens aperture stopped down OK to f11 for the shot. There had been an occasional drop out of AF, but I put that down to the 5.6 aperture + 1EV loss for the TC. Interestingly Auto Area AF is disabled with the above combo. It just isn't available as you move through the menu.