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"If you really want wide views you need short tubes..."
That's basically true, which is why people tend to use binoculars if they want really wide field views - remember telescopes are really about magnification instead of wide angle viewing.
Conversely if you really want more magnification you want a long f ratio tube, eg a 25 mm plossly in my old 1250mm fl dob gave 50x magnification, put it in a mak, etc, with an efffective focal length of 2500mm and you instantly have 100x mag. It all depends on what kind of results you are trying to achieve.
Ron regards your question if you put a 2" ep into an adaptor that then fits in a 1.25" hole the problem is still that all your incoming photons are still being blocked / restricted by that 1.25" hole - think 2 lanes of traffic into 1 lane during roadworks then back to 2 lanes again afterwards. You are still limited by the narrowest point in the light path, ie the 1.25" hole.
What you need to do is see if your focusor already has 2" capability, or alternately replace the focussor with one that can accomodate 2" ep's. Not knowing your scope I'm unable to tell you much about that sorry, but I'm sure someone else here will be able to. Try asking the person you got it from, he(she) may know.
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