Excuse me, how can iPad4 directly connect Sony RX 100 camera? What data cable is used? Thank you!

The direct connection between iPad4 and Sony RX 100 camera requires a Lightning to USB camera adapter converter.

With the Lightning to USB camera adapter converter, photos and videos can be easily downloaded from a digital camera to an iPad or iPad mini with Retina display, so that you can watch them on the dazzling iPad display and share them with friends and family.

After connecting Lightning to the USB camera adapter converter, iPad will automatically open a photo application, from which you can select photos and videos to import and organize them into an album. When you sync the iPad with a PC or Mac, the photos and videos on the iPad are added to your computer's photo gallery.