There are three variables ss, aperture, iso, in manual there is no EC. In an auto or 'semi' auto mode there are zero, one or two variables set by the user and EC so again a maximum of three variables.
it never ceases to amaze me how complicated people make changing three values.
I think it'd be great idea to create diagram, maybe like square but with 3 corners. And place each value on those corners to show how they impact each other. We could call it three cornered square of illumination.
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