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Forum: Pentax SLR Lens Discussion 01-09-2015, 05:20 AM  
Sigma 17-70 "Contemporary": compatibility problems with Shake Reduction
Posted By rextang
Replies: 151
Views: 26,493
Can anyone test whether it has something to do with what angle (relative to horizontal) you hold the camera at the time the photo is taken? I'm not familiar with the gyro mechanism, but the gyro may have the most latitude to fix shake when shooting horizontal and the mechanism offers float equally in all directions on the focal plane. The theory I'm throwing out there is that at an angle the mechanism maxes out at its physical limit and you are not getting any SR at all, or blur is introduced when the mechanism starts bouncing off its physical limiters when shooting downward, upward, etc.
Perhaps it's some combination of incorrect data and the function of SR together that is causing the problem. Test away.
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