The Atomos H2S is an elegant solution to field signal conversion. We also carry a newer, more feature rich (but similarly priced alternative), Lumantek ez-HSV+. Key features include:

Feature-Rich Converter. It features HDMI to HD-SDI conversion with timecode start/stop trigger pass-through and 3:2/2:2 pulldown removal, power pass-through for Sony L-Series battery plates, a test-pattern generator, and an audio test tone.