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On the ED80 type refractors with a diagonal in place, it doesn't give a lot of back focus. Sure, with a webcam (or DMK if you're lucky) it might reach focus, but with other CCD's and DSLR's it's well neigh impossible. The QHY5 needs about 12.5mm back focus...
The answer is to remove the diagonal and use a extension spacer tube.
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