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
USED: Sigma 120-400mm f4.5-5.6 APO HSM DG OS Lens (Nikon Mount) | Keysers
File:Sigma 120-400mm 04.jpg - Wikimedia Commons
Used Sigma 120-400mm f/4.5-5.6 APO DG OS HSM - Nikon Fit | MPB
Sigma 120-400 mm f/4.5-5.6 APO DG OS HSM - LensTip.com
Sigma 120-400mm f4.5-5.6 APO DG OS HSM for Canon Digital and Film SLR Cameras
USED: Sigma 120-400mm f4.5-5.6 APO HSM DG OS Lens (Nikon Mount) | Keysers
Sigma 120-400mm f/4.5-5.6 DG OS HSM lens - Wikipedia
Sigma 120-400mm f/4.5-5.6 APO DG OS HSM Nikon Fit Lens
Sigma 120-400mm f4.5-5.6 APO DG OS HSM for Canon Digital and Film SLR Cameras