Calibrating camera to produce SQM results

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Here is a paper by Zoltán KOLLÁTH, and Anita DÖMÉNY  which provided detailed steps to calibrate an all sky image from a camera to produce mag/arcsec^2, similar to SQM meters:

https://arxiv.org/pdf/1705.09594.pdf

An example image produced by Andrew Cool from Yadlamalka Australia