Napioa - Wind Origins

Napioa - Wind Origins
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An optical 'zoom' or 'variable focal length' lens is one that has a range of focal lengths at which it can operate. "Digital zoom" is a technology which simulates optical zoom by cropping the image.

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SIgma 70 - 300 APO DG Macro Lens Zoom doesn't working after 270

My new Sigma 70 - 300 APO DG Macro lens zoom ring is not working after 270mm. In this situation what can I do? N.B: No external pressure is not given.