I am having an issue using my 50mm 1.4 on my D700. I am getting the "ERR" message and for the life of me can't figure out what is wrong. I believe I tested this lens with the D700 when I first got it and no issues, but I can't find the images to verify. The lens has been tested on a D200 and D90 as well, works fine on both. The aperture ring is locked at f16 (where I believe it is supposed to be)...I am out of ideas as to what could be wrong... Anyone else have any similar issues?