Shashin:
You can get the software at B&H
pentax 645d tethering| B&H Photo Video
A review is here:
First look at Pentax Official Tethering Software for 645D - PentaxForums.com
You can get the software at B&H
pentax 645d tethering| B&H Photo Video
A review is here:
First look at Pentax Official Tethering Software for 645D - PentaxForums.com