Balthasar Reuter

I'd rather use some GPIO solution directly as many use gphoto2 instead of the picamera module.

The error message should actually not be fatal. A number of questions: 1. Does it work if you use command line? 2. If yes, please remove lines 74-99 in [photobooth/camera/CameraGphoto2.py](https://github.com/reuterbal/photobooth/blob/master/photobooth/camera/CameraGphoto2.py)....

3. Is your camera supported by gphoto? I don't see Alpha 7 III or Pentax K20D in the list: http://www.gphoto.org/doc/remote/

That looks absolutely fine. Have you tried 2. above?

Please try the development branch, it should give some more details on the cause of the issue. If the issue persists, please post the new error messages. See here on...

Are you sure that is the development branch? I would have expected a trace back from the exception. Could you please post the output of `git status`?

This looks fine. Could you please update your copy to the latest version of the development branch? I have introduced an interface that allows to define model specific configuration options...

You don't have to specify the model - it is taken automatically from the data provided by the camera. But now we finally have a useful backtrace! And, most interesting,...

That sounds a lot like there are plenty of upstream issues in gphoto2 with your camera model. In particular, since the error appears during capturing preview (which is a single,...

Another thought: the [support list](http://gphoto.org/proj/libgphoto2/support.php) mentions the required capabilities only for "PC Control" mode, not for "MTP" mode. Your log output says ``` Vendor Extension Description: Sony PTP Extensions ```...