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Which way is it out of focus?
ie: you haven't got enough out travel, or haven't got enough in travel?
If it's out-travel, then a spacer/extension tube might help. If it's in-focus, then you may have to move your mirror up the tube, which is common for prime focus photography with DSLR's and Newtonians.
You could use eyepiece projection using your camera adapter - it's worth a try.
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