Just a quick question.
You can bracket exposure four ways - by changing the shutter speed (Tv), by changng the apature (Av), by changing the detector sensitivity (ISO = Sv), or using exposure compensation (EX).
What the first three things do (Tv,Av,Sv) is pretty obvious but what exactly is changed by EX?
I originally thought that all it did was provide a offset to the measured light intensity (Bv) but you can write a script that measures Bv and then set Tv, Av, Sv, and Ex with different photo exposures.
What does exposure conpensation change? It must be one of the first three things???