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 Lens Review
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Sigma DG APO OS HSM 120-400mm F4.5-5.6 Lens Reviews - Sigma Lenses - Pentax Lens Review Database
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