Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
edhannon Senior Member • Posts: 1,761
Re: Why 'more or less stopped using ISO'?

Which cameras do not change the content of the raw file when you change ISO without changing exposure (f-stop & shutter speed)? All that I am familiar with change the brightness.

All of the discusions about using bzse ISO and brightening in PP only talk about the impact to noise. The arguement is that, since SNR does not get better with increased ISO with the ISO-less cameras, you a re better off doing brightening in PP.

This ignores the potential for posterization when you push in PP. The curve of ADU wrt exposure in stops is exponential. The curve is very flat in the shadows and steep in the highlights. When you push by more thsn a couple of stops you loose a lot of bit re solution.

IMHO the best approach is to expose with as much light as you can and use ISO brightening to bring the highlights up to just short of saturation.

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