Wednesday, May 19, 2010

Focusing Issue with the DA 17-70/4 SDM

Recently I have seen four user reports by four different owners of the DA 17-70 about the inability of completing AF with the lens in the range of 50 to 70mm, in a Chinese forum. Direct links are as below:-

http://www.dchome.net/viewthread.php?tid=875053

http://www.dchome.net/viewthread.php?tid=875053&page=1#pid10272648

http://www.dchome.net/viewthread.php?tid=871324

http://www.dchome.net/viewthread.php?tid=871324&page=1#pid10221635

(Above: First Three Posts are in Traditional Chinese, the Fourth is in English)

So, what's going on? What happens for those lens units? What causes the problem? Design issue(s)? Quality issue(s)? Or Both??


Previous Related Articles:-


SDM Issue Strikes Again - This Time DA 17-70

The SDM Petition Online

SDM Reliability Issue

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