Nidelva river through Trondheim Norway

Nidelva river through Trondheim Norway
by Saaru Lindestokke                

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Where can I get the power supply specs for a Yongnuo YN-14EX flash?

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. ...
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Keeping a T3i on all afternoon and taking pictures with a computer

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 ...