Front glass of the camera is heavily vaporized in the air and therefore videos are always foggy. Shortly after landing, the evaporation is slowly gone and glass becomes clear again.
First I tried to dry the moisture in the camera with a hair dryer. That brought nothing. I think they take the moisture from the air.
Finaly l have lifted the front glass of the camera and now the videos wonderfull, even against light.
Se The following vdieos: First a short "before-after" video in comparison and then a long "after" video.
