Sigma 50mm f/1.4 EX DG HSM Lens Autofocus

[boels069]

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.

http://www.the-digital-picture.com/News ... ?News=4068" onclick="window.open(this.href);return false;

PDF van Bo Zhang (ook in het Engels):
http://media.the-digital-picture.com/Im ... gation.pdf" onclick="window.open(this.href);return false;

[edvdwal]

AF problemen zijn eigenlijk echt alleen gevonden bij het oude model hiervan (glitter-achtige lak) en niet de update (gladde lak) serienummer na 1009xxxxx sommige zeggen na 1016xxxx