fordmondeo wrote in post #18099834
Having owned a 5Dsr for three weeks I am pleasantly surprised at how low the image noise is even at 12800 iso
It makes me wonder why Canon restricted the speed level, unless of course the digic six has some kind of melt down after that.
I wonder if it's just a firmware thing?
As photo site (relating to a pixel) sizes drop, that ISO performance will not be as good. So the 5DSR didn't see an ISO increase, it saw a decrease' in that sense, due to smaller pixel sites on the same surface area (higher pixel density).
It can have decent ISO performance, it's still a modern full frame sensor.
Apparent noise has a lot of different things influencing it.