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For example, if I want to change camera ISO with the Pi Camera Module 2, I don't see any difference in images between:

camera.iso = 100
camera.exposure_mode = 'auto'
camera.capture(filename)

and

camera.iso = 800
camera.exposure_mode = 'auto'
camera.capture(filename)

which leads me to believe that the "auto" setting resets any of my ISO settings.

However if I make the same change, swapping in the ISO line for camera.brightness = 0 or camera.brightness = 100

... the difference is night and day :)

Any way to figure out what exposure_mode = "auto" actually dictates and what it doesn't?

Camera documentation for reference - https://www.raspberrypi.org/documentation/raspbian/applications/camera.md

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