I have a Sigma 105 mm macro lens (one year old) that I successfully use with D80 and D90. Have recently added a D5000 for professional reasons. The problem: The D5000 will not turn on at all with this lens attached.The camera works fine with Nikon, Tamron and even an old Vivitar lens (no autofocus) and it is not part of the recall.Has anyone heard of or encountered this problem? Is there a solution? Nikon has no answer, waiting for Sigma response (slow).Need live view for surgical photography. Other option is return D500 and get another D90 but I prefer the size of the D5000.Any guidance would be appreciated.POC
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