00:24 EST - At PMA 2010, IR publisher Dave Etchells and Senior Editor Shawn Barnett had a chance to sit down with Kazuto Yamaki, Chief Operating Officer of Sigma Corp., one of the world's largest manufacturers of accessory lenses for SLRs. Yamaki-san has an unusual perspective on the photo industry in general and the lens business in particular, having been involved in the management of Sigma for 17 years now. Read on to learn how modern computer ray-tracing software does the work of 10,000 1980's-era people. :-) Dave Etchells, Imaging Resource: SLR sales have really skyrocketed, compared to several years ago. As SLR sales have gone up, has there been an increase in lens sales? Or are the people that are buying SLRs as a step-up from from point and shoot cameras just sticking with the kit lenses? Kazuto...