I have seen yet again another Pentax user reported failure of the Supersonic Drive Motor (SDM) of his SDM lens:http://forum.pentaxfans.net/showthread.php?t=73981(Text in Traditional Chinese, use Babelfish or Google Translate to translate if needed)He said that he bought his lens in August last year and has used his lens only for 3 times!In fact, the SDMs of the DA* 16-50 and the DA* 50-135 seem
