I originally posted this in the compatibility listing, but I think maybe I shouldn't have done that. It might be better as it's on subject, I don't want to clutter that list with questions. sorry.
I see the AF-S 55-300 mm f4.5-5.6G ED VR is on the compatible list for the D3100. However when I put the lens on my camera I received a "lens not attached" message. Looking closer the 55-300 does not have the small target ball on the periphery of the mount face (which I presume the camera body using to idenitfy that a lens is in place).
Based on the compatibility charts (from Nikon too) I assumed this lens would work on my D3100 with AF. Any help? Am I doing something wrong or do I have an old lens or something?