http://www.the-digital-picture.com/News ... ?News=4068" onclick="window.open(this.href);return false;Sigma 50mm f/1.4 EX DG HSM Lens Autofocus Teardown Findings
Friend of the site Bo Zhang recently sent us his findings regarding autofocus problems he was experiencing with his Sigma 50mm f/1.4 EX DG HSM lens. After his teardown and testing process, Zhang surmised that paint loss on a specific rotor resulted in metal shavings that jammed the autofocus motor.
PDF van Bo Zhang (ook in het Engels):
http://media.the-digital-picture.com/Im ... gation.pdf" onclick="window.open(this.href);return false;