Hi Helge, as far as I know current version of astroberry server has already a version of libgphoto2 that fixes the problem I found.
Check your version of libgphoto2 by typing this command in the terminal:

dpkg -s libgphoto2-6
In the meanwhile, I will try to install current version of astroberry and I try to snap some photos with different exposure time. Notice that D3200 is still limited to 30s.

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