Originally posted by scratchpaddy Because cameras are already out there that accomplish the same thing (full color at every pixel) without needing sensor shift, and they do work with moving subjects.
I'm sure this sensor shift thing would add significant cost to the camera. The precision needed to move a sensor exactly one pixel isn't easy to achieve. When Hasselblad came out with the H4D-200MS, they offered to upgrade anyone's old H4D-50MS with the sensor shift for the low, low price of $10,000/€7,000. But maybe I'm wrong. Maybe that's just because it's Hasselblad.
Notice: All the following is to be taken with a grain of salt. I am no expert on manufacturing processes, except for what I read about this subject, so feel free to correct me if I'm wrong.
Yup, it could add additional cost to the camera. But in the case of Hasselblad, the cost to upgrade an old H4D-50MS is most likely higher than the cost to implement the same technology into a H4D-200MS.
Simply put, because they probably need to open the digital back in a white room (so dust doesn't fall on the sensor), install the shifting system without damaging the sensor, make sure the whole thing is up and running, close the digital back and test the device to see if it works properly. Possibly, this operation needs to be done more than once if the first attempt failed, which adds to the man-hours count. Considering the camera probably is assembled in such conditions to begin with, the upgrade probably doubles the cost compared to implementing the system in the first place, as it introduces a new step into the manufacturing process that wasn't there in the beginning, which is to open the digital back, take out the components, upgrade them, put them back in place and close the whole thing, hoping you don't have to do it over again.
The other thing you need to take into account is the complexity of the shifting system and the volume of units produced. The sensor on the H4D-200MS shifts six times (and in all four directions) in order to achieve the 200 Mpix resolution. The sensor on the K-3 might only need to shift one of two times, and maybe just in one direction. This can seriously make the challenge a bit easier for Ricoh engineers.
And while Blad probably had to design a shifting system from the ground up, Ricoh doesn't. They already have a sensor shifting system they know very well, and which improved a lot over the years.
The sensor I have in my K-5 can already shift to correct a small inclination with the horizon level, even when I'm shooting hand held, and while it may not be accurate down to a single pixel, it is accurate enough so I don't have to correct the horizon level on more than 10% of my pictures now. With the K-7 it used to be 90%, for while the K-7 has an horizon level indicator, it's not accurate enough to correct the issue down to below a degree. The K-5 has almost the same horizon level indicator, but you can use the sensor to correct almost any inclination left once the indicator shows a level horizon.
Now regarding sales volume, Hasselblad H4D-200MS sales probably don't count in thousands of units. More likely we're talking about hundreds of maybe even tens of units a year. That makes implementing such a technology at a low price difficult, for the sales never really can make up for all the development required to bring the technology into maturity, so the costs remain higher. The cost of Blad components are also higher to start with, for many of them are manufactured in countries where the workers' income is higher than in the Philippines, China or Malaysia. The cameras are also assembled mostly by hand, whereas DSLRs tend to require less hand-made assembly operations.
This helps keep the cost of DSLRs low, and the huge amount of units produced help absorb the costs of R&D investments in a rather rapid manner. Hasselblad can't do the same here, for their sales volumes aren't even close to those of those of the D4 or 1DX, which remain speciality products in the realm of the DSLR, let alone cheaper DSLRs like the K-5, D7100 or EOS 70D.
(The D800 was produced at around 30,000 units per months in the early months it was introduced, which helped keep the cost down, and it was in fact more than two times less expensive than the D3X, yet with better AF, higher resolution, higher dynamic range, better high ISO noise levels, etc., with the D800 being just a bit less rugged than the D3X in the end. All this thanks to more—much more—units being manufactured than with the D3X.)
Now Ricoh could manage to keep the costs of a pixel-shifting device low enough by spreading it over a bigger volume of DSLR sales, and if the system is simpler to begin with (less shifting), I suppose it can remain affordable enough to keep the K-3's price close to that of the K-5 II's. In fact, besides the AF system and the sensor (and attached A/D converter and pipeline), I'd bet not much else will change in the upcoming K-3. The body could be the same as the K-7/K-5/K-5 II (and IMHO, it should be the same), the LCD monitor, viewfinder and the like don't need to be changed (except for the focusing screen, if the new AF has more focus points), the memory card slot will probably be the same as well, etc.
By now, all the manufacturing infrastructure needed to produce these components has already been paid for (at least for the most part), so the costs are limited to the R&D investments, the raw materials needed to produce the components and the workforce needed to assemble them.
But all this is theory indeed. I am no expert on the matter, but it's my guess.