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The desired average grey-luminosity the image should have at daytime resp. nighttime. The algorithm will attempt its best to hit that luminosity within a tolerance of +-5, and it will also try to find a smooth transition between both values during dawn or dusk.
Priority
Contrary to our conventional auto exposure, iterative auto exposure does not work with the cameras abstract EV value, instead it will control the three major exposure parameters itself. These are Aperture (f-number), exposure time (shutterspeed) and iso.
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