So, that's because the camera needs time to calculate the focus and exposure, but if you pre-focus with a half-press, leave your finger down -- no shutter lag!
所以那是因为相机需要时间 来计算焦点和光圈。 但是如果你先按下一半来预聚焦， 然后按下你的手指，没有快门延迟！