I know, but if investing so much money, suddenly the $13 000 difference doesn't seem so much. It may sound strange but the difference between 2000 and 4000 seems more than the difference between 20 000 and 33 000. And so I feel as though I want to have as full frame as possible so that my contax wide angle stays wide, for example. I am a bit worried about the file size, but I'm hoping that I will be able to accommodate my PC parameters accordingly. But you may be right. I should possibly give more thought to how much difference it would make to have a few more millimetres of chip for the extra money, and save the money for other hardware. Thanks for your thoughts