I was proud to be the official videographer to film the Inauguration Ceremony of Eastern US Chapter Tsinghua SEM North America Alumni Association. What a long name!!! It took place at Grand Hyatt New York.
The venue is a bit darker for camera. There is no spot lighting and front lighting. If I am using f4, ISO need goes to 2500-3200. I am using Sony a7s. Lens is 2/3″ B4 power zoom lens adapted to Sony e mount. APS-C mode+1.3x clear zoom in order to fill the whole sensor.
This is a frame grab from edited video.