镜头的技术介绍
后对焦／内对焦
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实现高速且精密的自动对焦
以上两款镜头是内对焦与♐STM步进马达的组合，短片拍摄和实时显示拍摄时可实现比老款镜头更安静流畅的自动对焦。
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后对焦、内对焦镜片结构示例（概念图）
上为无限远，下为约3.5米进行对焦时的镜片位置。
上为无限远，下为约1.2米进行对焦时的镜片位置。
内对焦和后对焦的优点
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benwangzhanbaohanyibufenguanggao/shichangtuiguangdengneirong，jingqingzhixi。
