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Open "Image Capture" (IIRC, in German it's called "Digitale Bilder", i.e. "digital photos") in your Applications folder and change it in that program's settings.
Under the General Preferences in Image Capture, you can choose to open no application when a camera is attached to your computer. Select this. Note, when you do want to download the photos from your phone or from a digital camera, you will have to launch e.g. iPhoto manually once this selection is made;