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You should only need the in-travel adapter if your 1.25" diagonal has a longish light path. My 2" diagonal works fine for eyepieces. See the vid I mentioned to see about what you'll need to focus your camera. If you're getting the field flattener - you shouldn't need to get an extension tube as well (at least not with the Orion flattener) But you'll need a T adapter for your Canon.
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