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I don’t know the exact measurement but it comes to focus with an image train with a back focus of 55mm. This is with a Skywatcher f5 Coma Corrector and the focuser racked out a little way. Visually the way it is set up in the pictures works. With the original focuser I could move the mirror sufficiently up the tube to just allow enough room for focus with the same 55mm back focus. Hope that helps.
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