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The rear port is not designed for eyepices

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Then why the 45 degree image correcting diagonal? That makes no sense to me. It's for birding I thought.

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It will work with the 45 degree diagonal because that it increasing the light path length enough to reach focus.

What I meant was; if you put the eyepeice straight in the rear port it won't reach focus - which is why I mentioned the extension tube.

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Meade ETX 90 UHTC, 497 Autostar, 884 tripod, right angle finder.

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