Pentax SR explained.

Martin Schou said:

Now, since I don't know how fast the SR can move the sensor, how quickly it can respond to movement, or the sample frequency, I can't figure out just how much shaking it can handle. And they're all important. If it can only move the sensor at 1 km/h it's useless. If it could do it at say 300 m/s, but takes a second to calculate the compensation, it's useless. And it only samples the movement over a second it's also useless.

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One fact can be gleaned from the datasheet of a typical gyro sensor, the max frequency it can respond to is 150Hz, so 1/150sec won't be too far off the mark for how quickly it can respond. (i.e. SR can't work at faster than 1/150sec, but obviously that's if this actual sensor was used)
http://www.fujitsu.com/downloads/EDG/binary/pdf/find/24-2e/4.pdf

As for the sensor's maximum speed when being pulled around by electromagnetic force, I would think the switching speed of relays may give a clue, they are typically 9ms having looked up several small ones specifications, so it's 1/110sec to move a couple of mm.

150 Hz is quite slow. The gyros in the Wii MotionPlus are 100Hz, and that's a cheap ass toy.

And 9 ms also sounds quite slow. It's down at 0.11 m/s. You should be able to do it much much faster.

Brad99 said:

Martin Schou wrote:

As for the sensor's maximum speed when being pulled around by electromagnetic force, I would think the switching speed of relays may give a clue, they are typically 9ms having looked up several small ones specifications, so it's 1/110sec to move a couple of mm.

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You cannot compare with relays, the motors used are of voice coil type, very similar to those used in HD-drives to move the little arm back and forth. They can be pretty quick, it's only a matter of power and mass.