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I tried one of the cheapie "canon" external power supplies off ebay, and had problems with ground loops through the mount and PC etc, so I used the little fake battery adapter from this power supply and hooked it up to a DC-DC converter (from Andrews) that could output the 7.5 volts that my canon needs from a 12 volt supply. Now I run my camera from my 45 amp hour deep cycle battery, which should give me several days of shooting before needing to be recharged. And no more probs with ground loops.
Adam
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