New Sigma lens.. is this normal

Started May 10, 2014 | Discussions thread
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chillkoots New Member • Posts: 4
New Sigma lens.. is this normal

I posted this in another area but didn't get a response.

Sigma 18-250mm DC Macro OS

Just got this lens. when zooming in between 18-35 its smooth, between 50-135 its jerky requiring extra push to move it, between 135-250 it feels smooth. If I move fast then its fine. Its impossible to take a good video with this when zooming in slowly. Is this a defect or normal for a lens?

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