The FOV feature of the YI 4K camera contains three viewing angle modes Wide, Medium and Narrow but not all the video resolution in the camera can support all of the 3 mode simultaneously. For now, we summarize this feature as below:
1, all the 4K,Ultra mode and fps greater than 60FPS including the 1440-48/60/50 fps only support Wide mode under the FOV option in the camera.
2,all the 2.7K mode(besides 2.7K Ultra) and 960-60/50fps only support Wide and Narrow mode under the FOV option in the camera.
3,1440-24/30/25fps and 1080-24/30/25/48/60/50fps can support Wide, Medium and Narrow at the same time.
Below is the table that you can get more information about FOV viewing angle supported under each video resolution in the camera.