>>3975429The 5DS R has 10 stops of dynamic range. This leaves 2 stops for showcasing the entire range of middle grey to deep black.
In sRGB the white point is defined as 80 cd/ m2, the black point at 0.2 cd/ m2, which gives 400:1 contrast ratio or 8.6 stops of dynamic range.
Lets assume the brightest part of your image is one stop above the blue of the sky (perhaps a white cloud, that's closer to +2 or +3, but lets be generous).
So now you place a white cloud at +4, blue sky at +3, green of the forest at 0 and you only have detail down to -2. But there's another 2.6 stops left in your color space. Your deepest shadows are now lifted greys or crushed blacks. Your -2 shadows are now quite noisy due to being lifted 6 stops.
Pic related is a 6D image shot at iso 100, F16, 1/30th. The 6D has a slightly better dynamic range than the 5DS R (6D at 10.2, 5DS R at 10.16). I tried recreating the steps above. Source:
https://www.photonstophotos.net/Charts/DXOPDR.htmYou'd need to extend your dynamic range by a minimum of 2.6 stops beyond the 10 stops of the 5DS R to even recreate a naturally looking forest scene with blue sky visible between the leaves. This still leaves you with super noisy +6 stops lifted shadows though. You'd probably want an additional two stops of dynamic range to not have your deepest shadows so close to the noise floor of your camera. We're now at 14.6 stops.
You can get around this problem by doing a HDR. A three frame HDR +3 0 -3 would suffice and afford you an additional 6 stops of dynamic range, bringing you to 16 stops. Great. But its no longer a single exposure.
Pic related, same scene, -3 0 +3 HDR composite. Scene was raised 2 stops, Highlights -100, shadows +100.
No noise reduction or sharpening was applied in both photos.
I think its quite obvious that real world scenes definitely has a use case for more than the 10 stops of the 5DS R. Just noticed I took the dynamic range numbers for "low light ISO".
