After many delays, Pentax introduced this medium-format digital SLR in March 2010. It boasts a 40 megapixel CCD sensor manufactured by Kodak. At the time of its introduction, the Pentax 645D was many thousands of dollars cheaper than other 40 Mp medium-format cameras on the market.
The name "645D" signifies that the camera may use lenses designed for the Pentax 645 film cameras. However the D's actual sensor size is 44 x 33 mm leading to a "crop factor" of 1.27x compared to using lenses on their original 56 x 41.5 mm film format. At the time of introduction, only one 645D-specific lens was a available, the Pentax-D FA 645 55mm F2.8, a standard lens whose focal length exactly matches the digital image diagonal.
|Japan Camera Grand Prix|
| Camera of the year
1984: Nikon FA | 1985: Minolta α-7000 | 1986: Canon T90 | 1987: Canon EOS 650 | 1988: Kyocera Samurai | 1989: Nikon F4 | 1990: Canon EOS 10 | 1991: Contax RTS III | 1992: Pentax Z-1 | 1993: Canon EOS 5 | 1994: Minolta α-707si | 1995: Contax G1 | 1996: Minolta TC-1 | 1997: Nikon F5 | 1998: Pentax 645N | 1999: Minolta α-9 | 2000: Canon EOS-1V | 2001: Minolta α-7 | 2002: Canon EOS-1D | 2003: Canon EOS-1Ds | 2004: Nikon D70 | 2005: Konica Minolta α-7 Digital | 2006: Nikon D200 | 2007: Pentax K10D | 2008: Nikon D3 | 2009: Canon EOS 5D Mark II | 2010: Olympus Pen E-P1 | 2011: Pentax 645D | 2012: Nikon D800 |