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Don't forget the length of light path taken up by the diagonal, say 120mm. (Measure it to be exact).
A typical Binoviewer is 120-130mm so if you want to use a binoviewer (without 2x amplification) you will need to shorthen the tube by 120-130mm or use it in straight through mode.
Binoviewers in 1x mode are only good for SCT's where focus is achieved by moving the primary mirror or shortened refractors when using a diagonal.
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