Originally posted by Zygonyx I think we all agree with this statement Spock.
As far as i can see, according to the size (diameter) of the mount, putting a 1/1,6" sensor is feasible even keeping stabilization.
Now this doesn't answer the question of present lenses' image circle.
look for example at the Fujifilm F31fd with 1/1,6" sensor, in comparison :
Hi Zygonyx,
I don't think the diameter of the lens mount means that much. I think that they made it larger than necessary for strength, ergonomics (a larger diameter lens barrel for easier MF -- imagine manual focusing with a lens the diameter of a cigar. . .), and for the possibility of faster longer FL lenses (since these would take advantage of one of the Q's strengths -- the 5.6x crop factor -- I could be biased here
)
The bloggers' preproduction presentation by Pentax in Japan seemed to indicate that the Q's image circle (and SR assumed) was large enough for 1/1.7" sensors, and perhaps a little larger (1/1.6" ?) The Google translation isn't really clear. . . Remember that the design concept was developed a while ago, and they were waiting for the "right " sensor. It seems to me that with that design plan, it would have been very short sighted to limit the image circle to one that would only take a 1/2.3" sensor. They stated that's one reason that they omitted the 35mm EQ FL from their lens designations -- it would tend to tie them into a particular format.
This means that they rejected the Sony 10 MP 1/1.7" CCD sensor which has been available for a couple of years. My guesses are that this sensor needs a larger body for heat dissipation than the very tightly packed Q, is not capable of full 1080 30fps HD video (either because of speed or heat), and the format doesn't sell enough units to merit the timely application of newer technology as does the very popular 1/2.3" format. Consider that the Samsung uses this sensor in this format instead of developing their own. It would have been a much more major marketing mistake to have to back off from 1/1.7" to 1/2.3" for lack of future sensor development..
Canon had to make their own sensor to get a CMOS 1/6.3" sensor in the new S100. Nikon's recently announced P7100 is still using the 10MP Sony 1/1.7" CCD -- Obviously Pentax cannot make its own sensors, so they have to rely on what's available -- and Canon doesn't seem to sell its sensors to be used by other mfgs, but I guess things could change. . .
Future Q models could see an upgrade in sensor size if/when more advanced sensor technology becomes a reality in a larger format. They already have a possible sensor upgrade path to the 16MP BSI 1/2.3" sensor that's already showing up in some compacts. I think they made the right choice in introducing a smaller than 4/3 compact ILC system. Nikon's rumored MILC at @ 2.5x crop sensor validates the concept of a smaller than DSLR sensor for smaller lenses and a more compact system, Pentax only took it further, and uses sensor based IS.
I think that it's most likely that Nikon will use OIS (VR) lenses which will make their lenses considerably more expensive if their DSLR line is any indication. It would be hard to justify using sensor based IS after years of touting OIS as superior, and difficult to offer low priced VR MILC lenses and very expensive VR DLSR lenses. . .
It's not inconceivable that Canon developed its 1/1.63" CMOS sensor for not only the S100 and next generation Gxx model, but for an ILC system using that format, since they have not entered the MILC market. Their marketing muscle could make this a viable segment and spur Sony (or another chip maker) to further develop the format, making a future 1/1.7" or 1/1.63" sensored Q a strong competitor since it could be the only one with sensor based IS and less expensive lenses.
I guess we'll have to see what develops. . .
Scott