After first announcing the Lumix S1H at the end of May, Panasonic is officially launching the L-Mount camera today, adding a third offering to its full-frame mirrorless lineup that includes the high-resolution S1R and the hybrid S1. If the S1R is for stills shooters who demand the best possible resolution and the S1 is for hybrid shooters who want the best combination of video and stills performance, the Panasonic Lumix S1H is all about video. The S1H packs a ton…