What is this fascination with iso6400?

Started Feb 11, 2013 | Discussions thread
Detail Man
Detail Man Forum Pro • Posts: 16,807
Re: What is this fascination with iso6400 ?

DigitalPhilosopher wrote:

dosdan wrote:

Your reply does not explain how you are going to defy the laws of physics.

I am not a physicist (apparently you are?), ...

If a camera was able to provide the same Dynamic Range and Signal/Noise Ratio over a scalar range of 16 ("ISO=50 to ISO=800"), then there would exist no seemingly sensible purpose for the cameras to even offer a setting below ISO=800. What user would not choose to use a 16 times higher Shutter Speed for the same Scene Illumination and lens-sytem F-Number (if) the DR and SNR are constant ?

The motivation to choose lower ISO settings is entirely based upon the fact that such systems offer higher Dynamic Range (higher maximum image-sensor illumination levels) at lower scaling levels ...

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