The OM-D E-M1 interchangeable lens camera is now the flagship of Olympus's Micro Four Thirds lineup. Rather than calling it the follow-up to the E-M5, Olympus says that the E-M1 is actually the 'successor' to the E-5, a Four Thirds DSLR introduced back in 2010. The E-M1's 16.3-megapixel Live MOS sensor has on-chip 37-point phase detection, which allows the E-M1 to focus legacy Four Thirds lenses (using the optional MMF-3 adapter) at much faster speeds than previous Olympus m4/3 cameras. When you're using Micro Four Thirds lenses, focusing is handled by the EM-1's 81-point contrast detect AF system.