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Shorter diagonal.
I have a 50mm Borg finder scope with a helical focuser and would like to fit a diagonal, 45 or 90. The 90 I have is too long and cannot reach focus without removing the focuser and fitting an extension tube which places the diagonal and eyepiece closer to the objective.
I need to move the diagonal about 5 or 10mm closer to the objective, while retaining the focuser. I imagine a diagonal eyepiece combination with a shorter light path. More compact.
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