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Message: <blockquote data-quote="J-see" data-source="post: 433492" data-attributes="member: 31330">The Nikon tubes are basically an open piece of metal allowing zero communication with the lens. As I discovered after buying. But I can still meter light through them with the D750 and use the exposure preview when switching to live. I also get focus confirmation since that is all done by the cam.But unless it is a lens with an aperture ring like my macro, if the TC does not communicate, it closes the lens down completely. Only when fumbling stuff into the aperture switch I could get the lens somewhat open but I'd rather not do that.There are other brands of E-tubes allowing communication so be careful which you buy. Else you end up like me paying too much money for what is basically just a tube.</blockquote>