22C-D017H103

22C-D017H103

22C-D017H103

22C-D017H103

镜头通过某种方式装上机身——通过镜头接口。接口有2种主要类型：螺纹接口，及刺刀式卡口。前者在新镜头上已经看不到了，所以基本可以忽略。刺刀式卡口的优势很明显：装卸速度快，镜头在机身上更，允许设置电子触点——实现自动对焦和自动光圈的——等等。

目前佳能镜头使用EF或EF-S卡口。其中EF镜头可以用在EF-S机身上，但反过来不行。因为EF-S镜头是针对小尺寸传感器设计的，缺点就是如果你升级到全画幅机身，EF-S镜头就没用了。

尼康现在的镜头使用F卡口，针对小尺寸传感器的镜头被称作DX镜头。此外还有微单相机使用的Nikon 1镜头卡口。

每一家相机厂商都有自己的卡口，一般都不通用。

用户可以购买转接环将镜头装在不同机身上。对微单相机来说转接更容易，因为传感器和机身都较小。

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