When the basic value is the aperture value F 1.0 and the shutter speed is 1 second
It is important to light first at shooting location.
Watch the aperture and shutter speed automatically set by the camera in the room.
If you get used to it you will be able to manually expose.
In the case of fine weather, the aperture value is F 8.0 and the shutter speed is 1/500.
Or the aperture value is F 5.6 and the shutter speed is 1/1000.