Hi guys. I would be very grateful of any help. I purchased a second hand Nikon D800 (with only 8000 actuations) £985-00, absolute bargain. I also purchased a Nikkor 24-85mm 2.8 - 4 D lens. (No VR) I was hoping to use this lens on my 'holiday camera' (D5100) but this error comes up every time? I have tried locking at F22 or setting to F2.8 unlocked but the same error comes up. Any ideas? Gutted that I disposed of my 18-105mm DX that used to sit on the D5100 but I thought this lens would perform even better on it?