I did a quick search on google found some people having similar issues.
I should be home in 1hour so I'll check on mine. There should be no difference between on and off but at least we will have a confirmation.
One thing I thought, was there a filter on the lens you tested ? A Neutral Density / Polarizer could have been affecting what you are seeing.
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Nikon D300, 35mm f/1.8, 85mm f/1.8, 16-85mm f/3.5-5.6 VR, 70-300mm f/4.5-5.6 VR, SB600
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