As far as I know there are only 4 cameras with backlit sensors, and that would be the Sony A9, A7R2, A7R3, and the new Nikon D850. I understand that in theory at least it's suppose to give improved noise performance, and it may, but I'm not sure I can see that dramatic a difference. Looking at the D850 in particular, and comparing it to dxomark's High iso sports score I think they call it, I see it's slightly worse than the previous D810. Granted, it's rocking about 10 more mps, but still I would have expected a little more obvious improvement. In any event if you compare it with the D500 which is not backlit you can see the old tech holding it's own in this regard. Perhaps someone of a technical nature can explain to what degree, and reason a backlit sensor preferable.