Sony said that the NEX-5R includes a redesigned 16.1 megapixel Exmor CMOS sensor, which integrates 99 phase-detection AF points. The NEX-5R uses those points to quickly acquire a focus point, and then uses contrast detection to refine the focus point (or “confirm extremely fine, precise details,” according to Sony). Phase detection is also used during high-speed continuous shooting in order to achieve continuous AF at 10 frames per second.
Phase detection AF is used in higher end cameras such as DSLRs. Contrast detection AF is used in lower end cameras such as point-and-shoot cameras and most mirror-less cameras. Phase detection is faster, but contrast detection can be more accurate. The NEX-5R has both. This is the most important feature that makes the NEX-5R better than the NEX-5N. Available in October and priced at US$650 for the body only or $750 with an 18-55 mm kit lens.