Is that the long way to say that higher resolution is more sensitive to motion blur?This is a simple geometric issue, the more pixels you have on a sensor, the smaller the angle each pixels covers, therefore, when an object moves while you take a picture, the more pixles you have on the sensor, the more pixles will be effected by the same move. For example, if your object moves in one degree per second, and you have 10 pixels per degree, you will get a "still" image if you take the image in less than 1/10 of a second, if you have 100, then you needd to be faster than 1/100 of a second. if you have 1000 and so on. So when a bird fly or move (as they uauly do) the more pixels you have, the shorter the time needed to get a "still" of them is needed (remember that you take those pictures hand held, so you also needs to account for your own movement at the same time). While birds tend to move much fater, than eventually, you won't be able to have a "still" image of them flying cause once you have so many pixels, the spees you will need to capture them will be beyond 1/8000 of a second. Same goes to IBIS, the more pixels you have, the shaling of the hand becomes more noticed, for the same reason.
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