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'?

The way I use ETTR is:

  • Determine through testing how many stops above the meter reading saturation of the first channel occurs. I do this by taking images of a gray card at various exposures and plotting the raw values of the three channels.
  • With this knowledge I spot meter the important highlights - the ones I need detail in.
  • I use Zone System to "place" important highlights below saturation.

Spectral highlights do not need to be placed below saturation - only those that I need to retain detail.

Note that I only do ETTR when I have a difficult subject brightness range and need the precision. Most of the time Av or Tv modes are adequate.

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