众所周知，西格玛（Sigma）是日本制造摄影和摄像镜头的专业厂家之一，与Talnron、Tokina、Vivitar等这些名牌厂家并驾齐驱，每个厂家几乎都有自己的拳头产品，在剧烈的市场竞争中稳坐江山，但是西格玛公司开发新品产的劲头似乎更足，系列化产品推出既多且快，而且质量上乘，有 As we all know, Sigma is one of the leading manufacturers of photographic and camera lenses in Japan, keeping pace with such brand-name manufacturers as Talnron, Tokina and Vivitar. Almost every manufacturer has their own fist products and sit tight in the fierce market competition Country, but Sigma’s momentum seems to be more adequate to develop new products, serialization product launch is both more and faster, and high quality, there are