image moves in viewfinder with Sigma 17 50 !!!
Yeah that's totally normal behaviour for stabilized lenses (IS / VR / OS / VC lenses).
It's barely noticeable on a wider angle lens like the 17-50. On my Sigma 120-300 f/2.8 the OS can really move the image around noticeably when it kicks in. The longer the lens, and the more you are shaking it, the more it will move around.
Many people list this as a principle advantage of in-lens stabilization vs. in-body (sensor-shift) stabilization. With in-body stabilization, the image you capture may not be exactly what you see in the viewfinder. With in-lens stabilization, it always will be.
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