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Anonymous
There is also the possibility of using both Lens and body stabilization during operation the the "Live View" mode. In that mode there could be feedback from the sensor which could be used to add stability via sensor-shift, though the issue would be complicated by that fact that the feedback element (the sensor) would be moving. Live View isn't a "normal" mode of operating right now, though it is popular with photographers upgrading from P&S digicams and is becoming a "must have" feature on all new DSLRs.
Of course a gyro-based sensor-shift stability system would also be required, since it's likely to be the best way to do sensor-shift stabilization when operating without an IS lens on the camera.
The advantage of such a dual systems wouldn't be just technical. Canon (and Nikon) are presumably very reluctant to use sensor-shift stabilization because it would eat into sales of their image stabilized lenses. However if they could offer a system which gave more stability than by the use of either lens or body based stabilization alone, they'd actually have a marketing and performance advantage! The technology required is challenging, but so were AF cameras, DSLRs and both body and lens based IS systems. I think it could possibly be done, though it would certainly not be easy.
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