Photos - Disable Auto start

I am a Lightroom/Photoshop user and do not wish to use the new Photos program. I can not find a way to disable the Auto Startup feature in Photos whenever a device is connected to my iMac. Any suggestions?

Steve it's a little counterintuitive but first you have to connect the camera>SD card whatever, before you get the option to prevent it from happening.
See this article; How to Stop Photos Opening Automatically on Mac OS X when iPhone or Camera Connects | OSXDaily