Olympus has embraced the camera designs of yesteryear for several generations, from its first Micro Four Thirds models to last year's E-P3. But now the Japanese camera maker is stepping up its retro game, announcing a brand new line of Micro Four Thirds cams. Meet the OM-D. A dramatic departure from the more modern-looking PEN cameras, this new line of mirrorless models, specifically the E-M5, in many ways duplicates the design elements of the 1970s-era OM System. The