Pentax 645 digital system

introduction

neither the Pentax 645 Nii nor the Pentax 67II have any capability for interchangeable digital backs
in 2010, Pentax announced they would join the medium format digital camera market place with their Pentax 645D dSLR camera
Pentax 645AF2 bayonet mount:
- Pentax 645AF2, 645AF, and 645A mount lenses
system seems to have been discontinued in 2023

announced April 2014
51mp 43.8 x 32.8mm 0.79x crop (pixel pitch 5.3 microns) Sony sensor (same as in the Hblad H5D-50C and the Phase One IQ250 digital back)
Dust Reduction II ultrasonic cleaning system
SAFOX 11 autofocus system, which has 27 points (25 of which are cross-type)
3fps shutter is actually quieter than the one on the Sony A7r and is rated for 100,000 cycles
1080/30p video
Live view mode with face detection AF and reasonably fast CDAF
x-sync 1/125th sec
USB 3.0 port
support for remote WiFi via Flucard
dial for mirror lockup
articulating 1.04Mdot 3.2“ LCD
interchangeable focusing screens
weathersealed and usable down to minus 10degC, 1.5kg
$US8499 body only

announced March 2010
40MP, 44 x 33mm CCD sensor made by Kodak with 14bit A/D converter and 11.5 stops dynamic range
921k dot 3.0” LCD
dust-proof, weather-resistant construction with 70 special seals
top shutter speed of 1/4000 second that can withstand as many as 50,000 shutter releases
1.1fps
flash X-Sync: 1/125 sec
ISO 200-1000 (100,1,600 boost)
DR (Dust Removal) II mechanism
11-point wide-frame AF sensor with nine cross-type sensors positioned in the middle
77-segment multi-pattern metering
HDR (high dynamic range) function to create one composite image with an extra-wide gradation range from three images with different exposures
automatic compensation of distortion and lateral chromatic aberration (available in combination with the D FA 645- and FA 645- series lenses)
SD cards
compatible with the SDM (Supersonic Direct-drive Motor) autofocus mechanism
compatible with the existing Pentax 645 system lenses