Hi again Ben
You are on the right path but the one you are after is in the photo below, courtesy of Bintel's website ($39 is the price and you will find it on page 1 of their telescope accessories). It goes in to the rear of your ED80 and then the barrel off the camera goes in to that. I certainly needed it when I used my ED80 with both a 400D and a 20D.
Wayne
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