The OM-D E-M1 is the joining of Olympus E-series of Four Thirds with the OM-D E-M5; it's their new flagship line, optimized to work not only with its native Micro-Four-Thirds lenses but with reasonable speed auto-focusing legacy Four Thirds glass as well. Compared to the OM-D E-M5, the the OM-D E-M1 is bigger, more traditionally SLR-shaped, with a faster shutter and flash sync; it also has a newer True Pic VII processor which can handle known lens corrections. While the OM-D E-M5 supported Bluetooth through an accessory for wireless file transfers, the E-M1 supports WiFi built-in. In general, quality is better, with more configurable buttons, and a more natural hand grip. It is also more durable than the already weather sealed OM-D E-M5, adding freezeproof to 14°F (-10°C) to its spec sheet.