Whats needed to use the flash while not connected to the camera.
There are really only a few steps.
a) Figure out how to mount the flash off camera. That can be a light stand, tripod or anything with a 1/4 x 20 bolt thread. Examples shown below.
b) Choose a method of triggering the flash from the camera. There are several options, some of which I am not familiar with. My experience with the cheap ebay Cactus trigger/receivers was a bad one - no reliability at all. Maybe 6 out of ten times the flash would fire. I bought a Universal set of Skyports in 2008 and they have been very reliable. Hundreds of shots at basketball games with no misfires. Other choices are offered by Pocket Wizards, Paul Buff's Cybersynch's, Radio Poppers and a newer model of the ebay triggers that have had some good feedback.
If you want to retain the ETTL capability, a 24 foot cable from Flashzebra should work just right.
Here are three mounting examples:
1) Spring clamp modified with a 1/4 x 20 bolt. Umbrella adapter mounted to it with cold shoe. Later I added a hot shoe adapter with wireless receiver plugged in.
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2) Spring clamp modified with 1/4 x 20 bolt through the center, umbrella adapter, hot shoe adapter with Skyport Receiver plugged into it.
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3) Super clamp mounted on handrail with hot shoe adapter/Skyport combo.