If you are looking for high image quality from a medium format camera, then the Phase One P40+ Digital Camera Back is a safe bet. With the excellent full resolution capture mode and the versatility of Sensor+ capture mode, the Phase One 645AF Camera with P40+ Digital Back is capable of handling virtually any professional assignment. 

 It features 1.3 lens factor

•  You can switch between 40 megapixel and 10 megapixel for better scalability in pixel size
• At a resolution of 40 megapixels, the pixel size is  6 x 6 micron
• At a resolution of 10 megapixels, the pixel size is  12 x 12 micron
• The P40+ 40 Megapixel Digital Camera Back enhances images to 7320 x 5484 active pixels
• The Phase One P40+ Digital Camera Back achieves a 12.5 f-stop dynamic range
• Image quality at full resolution capture mode will render excellent pictures
• A full 16 bit capture improves the color depth of the image
• Phase One implements the IIQ RAW File format for faster file transfer
• It can manage subtle colors tones efficiently using color management workflow such as RGB, Embedded ICC profile, and CMYK
• Output formats of Capture One such as TIFF-RGB, TIFF-CMYK, and JPEG are supported by this digital back
• The Phase One P40+ Digital Camera Back has a 2.2" LCD screen with a resolution of 230,400 pixels and a viewing angle of up to 160º
• The Phase One 645 Camera with P40+ Digital Back from Phase One supports all photographic lights from Flash and tungsten to daylight and fluorescent
• The P40+ 40 Megapixel Digital Camera Back has a CCD that measures 44 mm x 33mm and has an image ratio of 4:3

Resolution - 40 megapixels
Pixel size - 6 x 6 microns
Live area - 43.9mm x 32.9mm
ISO range - 50, 100, 200, 400, 800
Dynamic range - 12.5 f-stops
Bit depth - 16 bit per color
IIQ small - 26 MB RAW files
IIQ large - 40 MB RAW files

Sensor+ capture mode:

Resolution - 10 megapixels
Pixel size - 12 x 12 microns
ISO range - 200, 400, 800, 1600, 3200
IIQ small - 7 MB RAW files
IIQ large - 10 MB RAW files

P+ Product Range:

Lens Factor - 1.3
CCD size effective (mm) - 43.9 x 32.9
Active pixels - 7320 x 5484
Pixel size (micron) - "Full res. 6 x 6 "
Resolution (megapixels) - 40
Light sensitivity (ISO) - 50-800
Exposure time - 1/10.000 – 1 minute
Image quality - "16bit-OptiColor +, 12.5 f-stops Dynamic+ and Lens+ technology"
Capture time (Frames per second) - 1.2

Battery Lifetime (captures/ hours) - 2500 / 4
Image buffer - 1.3 GB High Speed RAM
Display - 2.2” QVGA TFT with 230,000 pixels, high brightness and contrast both indoor and outdoor, very fine details