Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
xpatUSA Forum Pro • Posts: 13,715
Re: Why 'more or less stopped using ISO'?

edhannon wrote:

Which cameras do not change the content of the raw file when you change ISO without changing exposure (f-stop & shutter speed)?

Sigma SD9, SD10, SD 14 and maybe the other Sigmas. The camera firmware creates the raw file from the sensor analog outputs (all three of them). The ISO setting does not change the 'gain' between the sensor outputs of (SD9) 550mV and the three 12-bit ADC converters. The firmware does some scaling, noise reduction, linearization but only passes the user's ISO selection as metadata in the raw file.

All that I am familiar with change the brightness.

Then you are only familiar with cameras that mess around with the gain between the sensor and the ADC, if that is what is meant by 'change the brightness'?

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