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Are you using a coma corrector? In this case the corrector will have a fixed back-focus distance (usually 55mm), in this case the ZWO guide at this link helps: https://astronomy-imaging-camera.com/tutorials/best-back-focus-length-solutions-55mm.html

If not using the coma corrector you should work out where is the focal point of your Newton, usually this is inside the focuser barrel for standard focusers (like SkyWatcher) and you may struggle to reach it (although I was able to reach focus with a DSLR and a a standard crayford on my old SW200P). If the focus is too deep in the focuser you either add a coma corrector or replace the focuser with a low-profile one.

Hope this helps.

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