Sigma DC 18-250mm F3.5-6.3 OS HSM Autofocus Lens - Nikon DSLR's. Autofocus, although initially slow and squeaky - it soon frees up, is operational and smooth from infinity through to close focus. With the highly versatile, ultra compact Sigma 18-250mm zoom lens, high quality images are assured across the zoom range while the state of the art Hyper Sonic Motor ensures fast and quiet auto-focusing.
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