The Recent F/stop Controversy

Started 1 month ago | Discussions thread
Michael Fryd
Michael Fryd Forum Pro • Posts: 11,288
Re: The Recent F/stop Controversy

tony field wrote:


You almost seems to be advocating that cameras need have only a "total light meter" that really would be a surrogate for image quality. Iso then becomes a brightness control.


ISO is already a brightness control.  The difference is that is is labeled based on light per unit area. I think we would be better off with something labeled based on total light captured.

Some people call this "effective ISO".  For instance ISO 100 on a 2X crop body is "effective ISO 400" because it captures about the same amount of light as an ISO 400 exposure on a full frame body.

It seems to me that too much emphasis on total light only complicates photography unnecessarily in spite of the fact that it is an extremely useful concept for a photographer to understand and know how to control.

A simple explanation may seem complicated at first if you are used to a complicated explanation.

There is little reason for a beginner using a digital camera to be concerned about light per unit area on the sensor.  Explaining the process in terms of aperture diameter, and total light captured really is a simple explanation.

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