That might be. But presently all the high end medium format backs use CCD as reported by Michael in his recent essay on the subject.
Bill
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Of course, current gen is CCD. The discussion topic here is the next gen and I guess we've drifted into technology details because of the rather specialised readership
In the mean time, speaking of current generation (since Photokina), here is a document which might explain what the Phase+ backs do. It would seem that they've implemented hardware charge binning, with extra registers at the top and bottom that bin R with R, G with G, B with B. The same structure allows live preview extraction.
The 44x33 mm chip presented resembles the P30+ size rather closely
[a href=\"http://www.dalsa.com/pi/documents/documents.asp]http://www.dalsa.com/pi/documents/documents.asp[/url]
- Selectable resolution
- Four times sensitivity
- Three times faster readout
+ 6dB SNR gain in photon noise regime.
+ 12dB SNR gain in read noise regime.
Of course, if this is what's done then running at hi-iso would mean dividing the file rez by 4. Useful nevertheless, but not quite what the Phase marketing guys were saying at Photokina (they were saying full rez at hi-iso).
Edmund