Strange that in 1-2 files I checked the difference of high/low exposed pixels is so small (I measured around 15% … less than 1/3stops) … while goes up to 2 stops in other files … is this controlable ?
I think for this kind of files, best is to use a companion raw_normalization utility like Magic Lantern’s cr2hdr for Dual_ISO files.
The 2 stop Image was shot using Googles HDR+ Stacking the other is pure sensor output
and yeah its controllable
“Default 0x00
[0]: 0 HDR disable
1 HDR enable
[1]: 0 combined gain used (during HDR)
1 separate gain used (during HDR)
[2]: not used
[3]: not used
[4]: not used
[5]: 0 short exposure determined by ratio (during HDR)
1 short exposure controlled by direct control (during HDR)”
EXPO_RATIO
"Defines exposure ratio between short and long exposure.
Short exposure value = coarse_integration_time / Exposure_ratio
1,2,4,8,16(unsigned integer) can be set. "
thats from the sensor documentation
the sample raw were not configured so it was sensor default ratio