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For prime focus it depends on the camera you are using.
I use a DMK21 CCD camera made by The Imaging Source.
I can achieve focus, on my PST, by using an adapter that allows the chip (in the camera) to be positioned closer to the eyepiece.
Some adapters have a ridge around the edge that is too big to go inside the eyepiece holder and so the imaging chip is to far away to achieve focus.
If you are having trouble finding a suitable adapter then perhaps you can grind the ridge off (if that appears to be the problem).
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