副厂镜头厂商Sigma适马于近日曝光了一款M4/3卡口专用的平价长焦镜头，镜头规格为75-300mm f/4.8-6.7，放在M4/3卡口相机上等效135视角焦距150-600mm，可以拍摄非常远处的场景，下面让我们来看看这款镜头的结构。 我们 ... 与奥巴很相似 适马曝M4/3口75-300镜头
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