Am I hearing things? Today I recv'd this Sigma 120-400mm 1:4.5-5.6 APO DG OS HSM lens with a Nikon mount. When in AF mode I can hear what I think are gears
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![Sigma 120-400mm f/4.5-5.6 DG OS HSM APO AF Zoom Lens Sigma SA mount [Mint] A602 | eBay](https://i.ebayimg.com/images/g/RUcAAOSw1Hxjb49L/s-l1600.jpg "Sigma 120-400mm f/4.5-5.6 DG OS HSM APO AF Zoom Lens Sigma SA mount [Mint] A602 | eBay")