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Message: <blockquote data-quote="J-see" data-source="post: 459293" data-attributes="member: 31330">Assuming the Kenko allows communication with the lens, there might be a difference between the aperture the lens is actually using and what the cam thinks it will be using. If that's the case your meter will give a different readout than it should.It's a guess since all works well without the tube. When the metering and exposure compensation are correct, there isn't much left which can cause an overexposure problem besides the aperture in use. Did you try cleaning the contacts?Or something might prevent the lens from closing down far enough. You can try shoot wide open and see if that is overexposed. If not, something in the tube might cause the issue.</blockquote>