From the Manufacturer:
The IQ250 is the world’s first CMOS-based medium format digital camera back. The 50-megapixel IQ250 features a Sony CMOS sensor that captures full resolution images up to ISO 6400. Whether photo sessions are held in the studio or on a mountainside, the IQ250 lets photographers capture stunning imagery in available light -- virtually anywhere and any time. With a sensor size of 44x33mm, the IQ250 offers 68 percent more image-capture real estate than any full-frame 35mm DSLR camera and the widest usable ISO range of any medium format camera system. Its phenomenal dynamic range of 14 f-stops enables photographers to capture the most demanding scenes in one shot, while retaining details in highlights and shadows.
The Phase One 645DF+ camera is designed to be a seamless extension of your creativity. Extraordinary capture becomes natural through ease of use and direct control. The mirror and viewfinder of the Phase One 645DF+ camera are almost three times larger than those of 35mm cameras, providing much greater control of focus and composition. While hosting a complete list of features and custom functions, the Phase One 645DF+ camera is extremely easy to use. All settings important to the exposure are easily controlled by manual dials and buttons.
Take advantage of the new Schneider Kreuznach leaf shutter lenses, digital focal plane lenses from Phase One or use your Mamiya 645 AF/AFD or Hasselblad V lenses for a broader choice and easy upgrade path.
Choose the Phase One Value Added offering and experience a perfect match of products and services for ultimate choice and complete peace of mind. Go with the Classic offering to secure the superior Phase One image quality at an affordable price.