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You should give yourself the option of both. Cyclops viewing has the edge for viewing fainter galaxies as there are some losses in using a beamsplitter and the brain doesn't recombine the light split between two eyes to equal the brightness of a single eye. You'll also get a much larger field of view with a single 2" low power eyepiece. You can get an 80mm extension for about $35 but bear in mind your diagonal size might be inadequate at this greater diagonal to focus spacing, and there might be some vignetting by the base of the focusser tube.
Mark
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