But what is the advantage over cropping after the fact? I can take a FF image and crop it to the dimentions of a 1.3 1.6, or any other "crop" right now. I could crop at 1.4, and more that to side.
I kind of understand Nikon's crop with DX lenses, but it's stupid as the DX lens coves more than the 1.5 crop area of the FF sensor. Thus if the camera just let you take FF photos with a DX lens, you could always just crop them yourself, possibly getting more MP, or even images that were square. And some DX lenses, especially zooms are known to cover the entire FF sensor, requiring no crop.