Building on the success of the medium-format Pentax 645D digital and Pentax 645 film cameras, Ricoh announced today the Pentax 645Z, taking on Hasselblad and Phase One at a fraction of the cost. The 645Z uses a 44×33-millimeter sensor like its predecessor, but switches from CCD to CMOS. The resolution increases as well, from 40 megapixels to 51 megapixels. It’ll capture 14-bit raw in PEF or DNG formats in addition to TIFF and JPEG.