Igazad van, egy post a fórumból, mi is az újdonság és mi az eltérés a Pentax rendszeréhez képest:
[I]The innovation in Canon's Hybrid system is nothing to do with rotational movements; all IS systems compensate for pitch and yaw. Pentax's adds roll, in contrast Canon's adds correction for vertical and horizontal shift. This means it should work even at macro distances - something no current IS system is really good at.
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Andy Westlake
dpreview.com/lensreviews
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illetve
[I]All systems compensate for rotational shake. Rotation around the x and y axes. If they didn't they would be mostly useless since that shake is the one that dominates the blur caused by shake for most kinds of photography.
Pentax have claimed they also can stabilise rotation around the z (lens) axis. It's unclear to me how much of a problem this shake is in reality. Perhaps at UWA focal lengths and very slow shutter speeds, particularly if poor technique is used. Lens IS can never correct this "roll" shake, it's an advantage reserved to sensor IS.
Canon's Hybrid (strange name...) IS corrects also for translational shake, a shake that doesn't matter at low magnifications (far distance) but is a problem with macro. Since it's only possible to measure acceleration, not velocity, I suppose it depends on the shooter cooperating and shaking around a point that doesn't move relative to the subject, for some time before the exposure. Then it may be possible to make a guess at a zero velocity reference and knowing subject distance correct the shake.
The effect will be a steady subject but motion blur (from the shake) in the background and foreground!
If Canon are right that this is a world's first, then Sony are wrong when their marketing claims they use subject distance information to improve SSS performance.
Just my two oere
Erik from Sweden
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