I have the same iPad that you are working with. I was not aware there were iPad applications that would process NEF files. I do load images from several Nikon cameras to the iPad directly via Apple's Camera Connection Kit, and the process shows that it can "see" there are both JPEG and NEF files on the SD card, but there is nothing to indicate the NEF files are being loaded to the iPad. I will probably buy a Mac this winter so that I will be living in both Windows and OS X worlds. Please let me know if you find there is a way to process NEF on an iPad!