This entry was posted in Photography, Software and tagged Canon, EOS 7D, OS X by twam. 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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