Visual my x5 is bad in the dark, it flickers at high ISO. always running in manually. has the latest firmware. love my sony A7 R2 image and video in the dark. can not be compared. It has nothing to do with light and hertz to do. I'm talking about is the noise flickering ring going at high ISO. this you can see if you also set the lens cup too. This is certainly something weakness in the whole system to X5 camera to do. The camera is very poor at light. Looks part videos that some antenna company puts out great movies in the dark as to be filmed with X5 !!!! I have no faith that all the films shown are used X5. I think it's fake camera, user surely something more proft to display. I will deliver my camera in and rather wait. Then X3 camera better in the dark! For those who book X5R. same sensor guaranteed equally bad light.