did some further research about color temperature (white balance) for day and night sky. There is an interesting paper about the Color of the night skycolor of the night sky . And another one for the daytime dependend color temperature between sunrise and sunset www.researchgate.net/publication/3287269...or_augmented_reality
Combining the two results, it should be possible to approximately set a reasonable white balance for allsky pictures without actually measuring it or using the unreliable automatic functions.

CS, Markus

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