Hello, we got 2 nearly identical iMacs, one Retina and one not, both with identical OSX and apps. When I connect my SONY camera to the non-Retina one, it is correctly USB-mounted as 3 devices. However, when I connect the camera to the Retina iMac, also Photos pops up, which I don't want. I can not find a preference that could prevent this behaviour. Thanks for reading. ;JOOP!