![]() The 4930 fits perfectly to the number of pictures I made with my Canon EOS 7D. the shutter count, by running gphoto2 -get-config /main/status/shuttercounter Now, we can read out one of these config options, e.g. main/capturesettings/exposurecompensation We should receive a list like /main/actions/bulb If we now try again to readout the support config options by gphoto2 -list-config ![]() We can quit the daemon by killall PTPCamera This is because OS X starts the Picture-Transfer-Protocol daemon which occupies the device. ![]() *** Error (-53: 'Could not claim the USB device') *** Make sure no other program or kernel module (such as sdc2xx, stv680, spca50x) is using the device and you have read/write access to the device. We might receive an error like An error occurred in the io-library ('Could not claim the USB device'): Could not claim interface 0 (m). If we ask gPhoto2 to query all support config options by gphoto2 -list-config Now we can switch on the camera and connect it by USB. Homebrew will install some libraries and gphoto2. ![]() If you have Homebrew installed, you can install it easily via the terminal by running brew install gphoto2 As it is written for Unix-like systems it can be compiled for OS X very easily. gPhoto2 is a free open-source tool which supports more than 1300 cameras. For my Canon EOS 7D this can be done very easily using gPhoto2. If you own a Digital single-lens reflex (DSLR) camera you might want to read out the shutter count.
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