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by barrkel 5514 days ago
The chances that you want to deliberately underexpose or overexpose your photo are lower than the chances that you want to specifically control aperture (for DoF) or shutter speed (depending on how you want to capture motion in your scene). It makes lots of sense to automatically set the ISO while you control the other parameters (while being aware of the quality loss inherent in high ISO, and keeping track of it).