Dear Alexey,
i converted to WGS84 (EPSG: 4326) and did the process (undistort...) again for writing the GPS params into the EXIF.
I am using Win10 and in the file details it just shows the height param (which is correctly taken from Photoscan). No LAT or LON or even Roll, Pitch, Yaw (which i need for the client to reposition each camera).
When watching the files in XnView it shows completely weird params in the "GPS section" of their EXIF menue.
Thanks a lot
Alex