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I'd just get an extension cable from a local computer or officeworks type store. 3 or 5m. HOWEVER .. a word of caution about length...
I at first had a 5m cable extending my canon's standard 1m cable. This worked 99% of the time but I did sometimes have drop-outs or strange unexplainable behavior. Having strange things going wrong in the middle of the night is frustrating and time wasting so I changed my setup to include a powered hub, so I now have:
PC <---5m cable---> Powered USB Hub <---1m camera cable---> camera
The powered hub is positioned at the telescope and powered by a 12v -> 5v converter. This way I get no drop-outs.
You can get extension cables which effectively have a powered hub at the end but in actual fact it draws its power from the USB cable it self. This usually works fine, but I suspect that in some situations this might leave the device(s) plugged on to the cable with perhaps insufficient power. Just a guess. I think DSE have them.
Also, if you just add a 3m cable to your existing 1m cable then you shouldn't have any problems.
Roger.
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