I was shooting at a park with my 70-200 VR at the park a couple of days ago a\on my D70. I was shooting in Apeture prioity mode at f8. All of a sudden all shots started to be seriously overexpoused. To keep a long story short I tested the camera with 3 other lenses with no problems so it isn't the camera's fault. Through trial and error I learned that the lens is stuck on an apeture of f/2.8. Any ideas of how I can fix this or is it a trip back to the factory. There wasn't any trauma to the lens, it just stopped working. Any ideas are greatly appreciated.