Check the shutter dial and aperturering to make sure you have the correct exposure.
检查快门速度光圈以确保正确的曝光量。
2
The aperturering is just taut enough and incredibly smooth, and obviously because they are designed for motion film and video, it is click-stop free.
光圈环结合紧密却又难以置信的顺滑，显然是专为电影拍摄设计的。
3
The aperture field distribution of the ring focus antenna is reviewed in view of the energy conservation law, and the simple formula for calculating its radiation pattern is deduced.