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Ok, I start a thread here to continue the discussion from this thread.

In the Sigma EM-140 DG it is possible to adjust the two lights individually. I think Rafael Estevez mentioned to me that he use this to get a more mellow lighting. I also think he doesn't use the ETTL/TTL, but uses manual settings. When I use ETTL I think the photos are almost always too dark. I'm not sure if this is because of the ringflash or the camera.