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I had heard of but never really considered using an artificial star, which I should. If I can make a suitable one I have a good candidate tree around 50M away from where I usually set up that I could attach it to.
Also, it is really worth considering a set of Bobs Knobs collimation screws if you have an SCT and it has normal screws fitted. the ones on the C925 required the use of a small, sharp, pointed screwdriver and the thought of waving that around near the corrector plate in the dark did not impress me much.
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