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Not much .The main advantage being that every function of the electronic communication is available .I.e can use the camera to set all the features on the flash via the menu system.
The cheapo Jessops flash gun I got works with the camera too but not all those functions are available .
There is also another option .Use a pc synchcable from camera to gun.I would think it would be cheaper and you would certainly be able to get more distance for your money .
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