When you press the shutter release on the camera, a complex sequence of events occurs, including setting the aperture in the lens, flipping up the mirror of an SLR and a lot more.
实际上，当你按下快门时，一套复杂的程序开启，包括镜头内光圈的设置、一块单镜头反射镜的升起和其他更多的步骤。
In order to reduce the obscuration, conical baffle of secondary mirror is ameliorated into a shutter one.
为了减小初始中心遮光比，将次镜锥状遮光罩改进为百叶窗式结构；
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