Marc
TPer Emeritus
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Whilst using my Sigma 105mm today it suddenly started vibrating noisily when I turned the camera off. When I turned it back on, it vibrated again and won't autofocus. The camera is set up with AF as default, but the camera is switching on in MF mode and I can't change it to AF. When I changed lenses it was fine but when I put the Sigma back on it vibrated again and would come out of MF, so it definitely seems to be the lens. Looks like it will have to go back (Only a few months old so still in warranty). Should I send it back to Warehouse Express or contact Sigma direct?