I recently bought this flash for my Canon 70D, a Yongnuo YN-14EX macro ring light. Since it is equipped with a connector for external power supply... ... I want to build a power supply on my own. ...
I have a straightforward seeming project for my Canon 600D but it requires two simple things: a) power to the camera keeping it on all afternoon b) a library for interfacing with the camera via USB ...