I assume I'm missing something here, but as there are 2 lens types available for my camera, one designed for it and one that happens to use the same mount both 500mm isn't there 2 possible results from a '500mm ' lens?
The only difference between DX and FX lenses is the size of the image circle, they don't need to make it as big on the dedicated DX lenses because they don't need to cover as large a sensor, so other parts of the lens can be made smaller. I'm not a nikon person but with the canon lenses equivalent (EF-S) they do more then just make the size of the lens board smaller. They actually move the lens element closer to the sensor then the equal 35mm lens. I'm not sure if Nikon does something similar. -deke
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