For the first time, professional-grade single-lens reflex cameras are gaining the ability to record high-definition video. That capability, photographers say, has the potential to transform both still photography and moviemaking -- and it's largely thanks to advances in the semiconductor technology used to make the image sensors inside these cameras. "I think this is the holy grail for news photography," says Randall Greenwell, the director of photography for the Virginian-Pilot, a newspaper in Virginia.