davesrose wrote in post #17092568
Fred's article is quite clear: the 5D image was scaled up to 36MP while the D800 image wasn't interpolated.
DR is the total tones of contrast from the largest intensity vs blackest black. On the sensor level, it is the saturation point vs SNR...again, white to steps of black.
No. DR is the difference between the noise hiss in your loudspeakers when you don't play musing to the highest volume you can play before they clip.
While total tones is how small steps the volume can be increased in.
Your Bluray or DVD may contain 24-bit audio while your CD contains 16-bit audio. A difference in the quality of weak sounds. But your stereo will still hiss it's noise at the same level and you can still play both DVD and CD to the same level before they clip.
The issue with the CD is that it handles weak sounds badly.
Just as a camera sensor have issues with shadows.
So DR is not number of steps from white to black. But number of stops from white to black. While tonality is number of steps within a stop.
It can be quite academic to try to compare the difference in DR between the sensor DR vs the recorded RAW DR. In the end of the day, though, the highest DR of a digital image is up to 14 stops of light: 14bpc file size. That's the maximum DR of any DSLR recorded medium. The math is quite specific: it's a log that goes like this in tonality: 2,4,8,16,32,64,128,256,512,1024,2048,4096,8192.
But that is irrelevant if the last stops are noise. You can't record an orchestra and be happy with it if you have 100 people busy talking while you record the sound. Having a 14-bit ADC doesn't mean you get 14-bit quality.
If the Sony sensors are able to fill more values in all stops, then there may be some more wiggle room with the darker blacks. However, in my real world post processing, I have yet to push my shadows up 4+stops.
My 5D2 doesn't require me to be even close to 4 stops before the image gets unusable. It's more like 9-something stops I get. So hardly any push at all gives banding.