1)What is the crop factor when shooting 4K video???

2)What is the difference in the processors in the NX-1 and the NX-500??

3)Is the buffer the same size in the NX-500 as in the NX-1?? Is it smaller in the NX-500??

4)Besides the obvious differences between the NX-500, and NX-1,what the REAL differences between the two??