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Message: <blockquote data-quote="Fortkentdad" data-source="post: 632502" data-attributes="member: 24285">[ATTACH]263737[/ATTACH][ATTACH]263738[/ATTACH][ATTACH]263739[/ATTACH]All taken with the TC on the D500 with the 200-500.I did hear that same whirr sound that I hear on the D7100 when I use the big lens.It does hunt - a lot for focus. It does work - and can get focus, sometimes quickly - but not always. But on the EXIF it reports a 35mm equivalent (FOV) of 1050mm  - not bad for a 500 mm lens.  Because of the odd sound (it is barely audible but I hear it).  I'd worry, even though I'm told not to worry, but I do worry that it is straining some mechanism, either in the camera or in the lens (most likely the lens focus system).  Not worth the risk. And the AF speed is too slow.</blockquote>