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Message: <blockquote data-quote="BF Hammer" data-source="post: 765098" data-attributes="member: 48483">My infrared converted D80 is doing exactly as you describe since about 1 year ago. I also tried the suggestions here, no joy. It's old enough and beat enough for me to trash.But my research suggests that this is an electrical contact in the aperture control problem. As in a switch contact. But it is buried deep in the camera and it is not a quick and easy disassembly to reach. It can be fixed by Nikon, possibly even an independent shop could since a D7100 is likely out of warranty anyhow. The DIY reset hold the shutter release with the battery removed is worth a try, but does not work for all.</blockquote>