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Hi Sophie,
I previously had a Skywatcher Black Diamond 150mm newt. I did give it a quick try attaching a camera to it and similarly could not get it to focus. I pushed the primary mirror up as far as it could go, then "slackened" it off slightly to give some flexibility for collimation and "hey presto", no problems being able to focus the camera. That 10mm or so made all the difference.
Hope this helps.
Cheers,
Daniel
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