A user-friendly toggle to disable this for all devices would be super. Perhaps under System Preferences > CDs and DVDs?

Meanwhile, fellow photographers, here’s a terminal command that will safely disable the automatic opening of Photos.app when you least expect it. Copy and paste everything after the $ into Terminal.app and press Return:

$ defaults -currentHost write com.apple.ImageCapture disableHotPlug -bool YES

Unlike some of the other workarounds on the Internet, this one works even when you regularly re-format your memory cards (as most of us do). And it doesn’t require you to delete Photos.app, which might potentially break something somehow. No reboot required, either.

Update (27-Nov-15): If, for some reason, you want to reverse this change and return to OS X’s default behaviour, here’s the command to run:

$ defaults -currentHost delete com.apple.ImageCapture disableHotPlug

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