>>3761368>An essay of being wrong
Lol>It's about extremes
Ok, but take any imaging sensor, the darkest value will still be black and the lightest will still be white, regardless of how wide your DR is. Hence a tiny Dr will make a black and white pattern, where a high DR will be shades of gray.>The thing with HDR is you merge multiple images to raise\lower those extremes
Yes, and the result is an image with minimal luminance variation (contrast) if you push it to the limit.>Arri chart
Again, that's ei, not iso, ei is changing the signal after capture, iso (gain) is changing it during capture. It's the difference between a volume knob and a gain knob on an audio amp.>The point of iso is to ensure the extremes are contained
No, that's the point of shutter speed and aperture, you're right that with digital it's the shadows that are affected; if I took the same photo at 8 seconds iso 100 and 1 second iso 800 both shots will look similar in exposure, especially in the highlights, but the iso 100 shot will have 3 stops better shadow recovery as there is more data in the low values that hasn't been swallowed by gain.
The only reason dark areas look dark\black in the raw sooc is because that's the way the processor, be it your camera or lightroom, has decided to render it, digital shots have lower noise in the highlights so they are designed to expose as far right as possible before clipping becomes a problem, if you have to lose a stop as you increase gain, you want to take that from the worst performing part of the image.