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http://www.photographybay.com/2010/03/10/pentax-645d/
The Pentax 645D is a medium format, interchangeable lens camera. It features a 40MP Kodak CCD image sensor measuring 44mm x 33mm, and a 14-bit A/D converter. The 645D offers a sensitivity range of ISO 200-1000, which is expandable to ISO 100 and ISO 1600. The 645D also features an 11-point AF system with 9 cross-type sensors positioned in the middle, and a 77-segment multi-pattern metering system. The 645D’s optical viewfinder offers 98% frame coverage. Additionally, the 645D features a 3-inch LCD with 920k dot resolution. The 645D stores images via dual SD card slots, which accept SDHC cards (but not the newer SDXC cards)