What is this fascination with iso6400?

Started Feb 11, 2013 | Discussions thread
John Sheehy Forum Pro • Posts: 19,124
Re: What is this fascination with iso6400?

dosdan wrote:

So please explain how an expose that has a 4x worse shot noise SNR ( a fact of life due to the quantum nature of light) can have the same "quality" as a ISO50 image with a 4x better shot noise SNR?

Simple.  You just include a variable neutral density filter over the sensor, and adjust it accordingly so that all ISOs have the same photosite exposure.

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