We're at the CP+ show in Japan this week and one of the busiest stands belongs to Sigma.

Best known for manufacturing lenses, Sigma is showing off its latest camera, the dp2 Quattro. Editor Barnaby Britton sat down with Kazuto Yamaki, CEO of Sigma, for a chat about the Quattro, as well as the challenges of the modern photography industry and what it's like being the head of a family business.