You're quite correct, Alan. There seems to be some misconception that using your FX lens on a DX camera is like adding a 1.5X extender. The photo you get from a DX camera and the DX crop photo from the FX camera is exactly the same. The difference is the DX photo looks bigger on your screen because it has more pixels than the FX crop so you can enlarge it more. This assumes both the DX and FX cameras have equal number of pixels in their sensors, like the D700 versus the D300. This will change with the D800. It will be the first camera made by Nikon where the DX crop is larger than say the 12mp D300. The D7000 will give the largest screen image at 16mp, larger than the 15mp DX crop of the D800.