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50mm extension tube is the answer!
You'll need a 50mm extension tube to go between the focuser and the DSI.
You can't use the diagonal with the camera.
I have exactly the same set-up ( ST80+DSI IIpro) but changed the focuser to a 2" Crayford type. Gives better stability to the attachments etc etc and means I have interchangeability between all the other telescopes.
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