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Lowest magnification
The televue comments ONLY apply for imaging systems ie photography.
Visually you are limited by the aperture of the eye. Yes, you can move your eye across the exit pupil but your still loose the available light. Also remember not to many CCD chips are bigger than a dark adapted eye ( the DSLR has a 18mm ? chip, so it may benefit from the lower magnification).
Long focus eyepieces can be made from old photographic lenses ie 50mm/ 80mm lens when used reversed ie looking into the front of the lens make great RFT eyepieces, well corrected and wide field! An adaptor can easily be made using the plastic lens cover ( camera body side) glued to a bit of 2" tube.
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