Apple’s new Photos app is pretty convenient when it comes to taking care of all the photographs you shoot with your iPhone. However when it comes to the photographs you are shooting for work or with a proper camera you are most likely going to want to work out of another application.
If you are being bothered by Apple Photos automatically launching when you import your images there is a quick solution to prevent it from happening. Just launch the Terminal (Applications > Terminal) and type the following into the command line:
defaults -currentHost write com.apple.ImageCapture disableHotPlug -bool trueWith that, Photos will no longer automatically open. If you find that you want to revert back to the original default setting just enter the following into the Terminal command line:
defaults -currentHost delete com.apple.ImageCapture disableHotPlugHappy editing!
Source: defaults-write.com