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Thanks! :-) After drawing some diagrams, I think I understand why. But couldn't the focal point of my arrangement just be left before the rear end of the telescope, after which the image is led out of the tube with a couple of barlow-like lenses? Perhaps you could even use the baffle tube to attach these lenses to.

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I believe this is called a relay scope, and something like it was discussed (or maybe exhibited) at this year's Stellafane.

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Merry Christmas!

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