Sigma's DP1 had a lot going for it -- despite a somewhat steep asking price, plenty of folks were won over by both its sturdy build and image quality. Now, after the world offered up a somewhat muted response to the DP2, the company's announcing an update of the former device. The DP1s features the same sensor and processor as the DP1 but adds some functionality, including the ability to simultaneously shoot separate RAW and JPEG images, and an option to allocate the QS (Quick Set) function to the digi
