Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
bobn2 Forum Pro • Posts: 58,563
Re: Why 'more or less stopped using ISO'?

edhannon wrote:

There are three places that brightening can be applied:

  • With amplification between the sensor andq analog to digital conversion (e.g. Pentax *ist line)

That doesn't apply any 'brightening', it just makes the voltage representing a particular photo-electron count bigger.

  • By using more bits in the analosg to digital conversion than are used in raw output file then bit shifting in firmware (e.g. Pentax K10)

That doesn't apply any brightening, it just changes the code used to represent a particular photoelectron count.

  • By processing the raw data either in camera or in the raw converter.

That is the only time 'brightness' is established.

The last one uses cheaper hardware but results in loss of effective bit depth.

Only the last one is brightening.

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