I have lots of DX lenses, and am considering going to full frame. I was under the impression that a FF body like the D700 would show an incompletely filled frame with a DX lens..e.g. there would be something like a circular spot with the DX-size image, and nothing beyond that. But I've recently been told that the FF bodies auto-detect DX lenses, and crop their sensor size to it's filled completely with the DX image. Does anyone know if that's the case?