« on: December 31, 2014, 07:17:40 PM »
Let me propose, again, another approach Canon could potentially use.
Let's say this camera has 7DII pixels, and 52 million of them.
That means it has 104 million separate pixels because of the dual pixel design of the pixels.
The pixels can obviously be read separately or they wouldn't work for phase detection focusing in live view and video.
So, let's say the camera has a mode where the two halves of each pixel are read at different ISOs. For sake of argument, let's say ISO 100 and ISO 1600 are used.
The result would be that the top four stops would have twice the shot noise they would have if you didn't do that because half of your data is clipped there. But who cares? The top four stops have so much signal that it really doesn't matter. The overlapping range would be the same. The bottom of the range would have something like 3-4 more stops of shadow performance due to the far lower read noise at ISO 1600.
Combine these two in a way similar to the way Magic Lantern dual-ISO works and you have a 15 stop or so DR image at 52MP.
Now, that 15 stop image won't fit into a 14 bit raw so you generate a 16 bit raw from your 14 bit * 2 raw data sets.
Now you have 80+MB raw files, give or take, with 52MP and 15 stops of base-ISO DR.
i proposed that already a long time ago when the 70d came out.
It seems canon is aware of this, but maybe cant make it work that easily (from some cryptic comments in interviews)
They may have even tried for the 7D II (causing the delay, extra firmware update for 7D).