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I did the same thing Andrew. Now I can control my 300D using the remote and control my 20D from the laptop by simply unplugging the 20D socket from the remote and plugging it into the serial to phone plug cable. Works a treat. Especially when I want to use the remote to take star trail subs with the 300D on a tripod and do DSO stuff with the 20D through a refractor. I can set the tripod far away from my laptop light and let it snap away with the remote and the laptop controls the 20D through DSLR Focus. Best of both worlds.
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