[harumpel]

Um noch mehr Verwirrung zur Diskussion beizutragen hier folgendes Zitat aus dem dpreview Forum:

Anti-shake and very fast shutter and shooting speeds are difficult to match up. At photokina 2004 this was explained to me by KM engineers, quite well. We went through the shortcomings of the 7D and the limits as the AS system in detail. The 7D (and 5D I would guess) use a low-mass, low traverse speed shutter which causes only the minimal amount of energy to be lost into the camera body as 'jolt'. The mirror has a slow, damped action and dissipates energy as sound instead of absorbing that sound into a body component. The flash speed is a result of the slow-traverse shutter design, and the AS, combined. The shooting speed is also partly a result of the original Sony CCD/firmware limits (no other camera with the same innards has done any better - nearly all were 2.7-2.8fps).

Someone else has noted that shooting with 2 second mirror lock up improves AS results. This is because the system really is very sensitive to vibration - it has to be - and the mirror and shutter despite their 'slow gentle' design still tend to set it off. I don't know how they would make a 5 of faster fps body, and faster high shutter, and prevent a good AS system (sensitive) from being triggered incorrectly during sequence shooting. No doubt they will find a way, but this and not any desire to limit specifications is the problem which keeps them down at 1/160th fastest fully open, 1/4000th top speed, 3 fps kind of level.

One advantage of in-lens stabilisation is that the sensor does not live millimetres away from the mirror and shutter mechanism, there a few centimetres of lens mount at least between the vibration of the camera body, and the in-lens sensors. I make this comment in case anyone says 'why doesn't the Canon XX trigger IS if you shoot at 8.5fps'? The question of where best to place the sensors, and how to isolate them from internal micro-shocks caused by the moving parts of the camera, will be something which continues to occupy KM/S R&D staff.

Link dazu:
dpreview Forum