Originally posted by jatrax Will the 645d remain part of the line perhaps at lower price or have we moved on?
And the question everyone wants answered. What is the significance of 'Z'?
The 645D will remain in the line-up as a lower cost option.
-From the official Q&A-
"Even though the 645D and 645Z products' appearances are similar, their features, including a faster operational response in the 645Z, are quite different. That's why we gave the new camera a name other than 645D. Generally speaking, "Z" implies the "ultimate." Since the new product boasts the highest image quality in the PENTAX digital SLR lineup, we decided to add the letter "Z" to the system description "645."