The camera does not know the aperture. It is guessing the aperture by comparing the TTL value and the light, that it measures with the little cell next to the finder, in complicate light situations like this it is often wrong.
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The camera does not know the aperture. It is guessing the aperture by comparing the TTL value and the light, that it measures with the little cell next to the finder, in complicate light situations like this it is often wrong.