消息来源：
http://www.dpreview.com/news/1009/10091002sigmasonyadvisory.asp

Sigma is advising Sony users that its lenses are not compatible with the latest Alpha SLT-A55 and SLT-A33 'translucent mirror' cameras and it will fix them for free where possible. Specifically, the aperture may not operate correctly, giving an error message on the camera. The company says it will be offering to modify existing lenses free of charge, however this may not be possible for some lenses 'discontinued several years ago'. It advises owners affected to contact their nearest Sigma Service Station.

大意如下：
Sigma镜头用于a33和a55的时候，光圈可能会工作不正常，给机身传递错误的信息。Sigma会提供免费的改造，一些停产的型号除外。

这样就有两种情况：
1.不送到维修站，不能正常使用。
2.送到维修站（日硕），一年半载后拿回来。

所以，用SLT的就别买Sigma镜头了，有Sigma的Sony卡口镜头的也别买SLT了。