I don't know why my camera isn't added in the default gphoto-udev rules... however adding:

SYSFS{idVendor}=="040a", SYSFS{idProduct}=="059c", MODE="0660", GROUP="camera"

to:

/etc/udev/rules.d/025_libgphoto2.rules

fixes:

"An error occurred in the io-library. (Could not claim the USB device). Could not claim interface 0 (operation not permitted). Make sure no other program or kernel module (such as sdc2xx, stu680, spca50x) is using the device and you have read/write access to the device."

You need, of course, to add your user to camera group. Nice pictures by the way.

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