On a Mac, when you plug in a camera, memory card, iPhone or iPod, the Photos app often "AutoRuns," that is, it loads automatically to auto-import photos regardless of the reason you actually plugged that device into your Mac.
Personally, this behavior drives me crazy. Sometimes I'll plug in my iPhone to copy music to, or I'll insert a memory card from my big, expensive digital camera to copy RAW files into Photoshop, without saving everything into the Mac OS X Photos app.
I wrote this app to disable the Photos app from automatically running when you insert one of the qualified devices. As with all my other utilities, you can restore the Photos App's default behavior at any time just by running it again and clicking the button.