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Installing the extender will mean that you will be racking the focuser further out, i.e.. it will give more back focus.
For example on scopes where binoviewers will not come to focus due to not having enough in-travel (back focus) adding an Extender will allow them to come to focus. On my TOA130 (from memory) the Extender 1.6x meant moving the focuser about 30mm further out.
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