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It’s about my equipment. The inner diameter of the oblique mirror bracket and tip ring of the 45 cm barrel has been increased to prevent eclipse. The 4-screw is not easy to operate, but it is good for working in the dark!
The optical axis looks like this! The F-4 Newton is small. The red dot on the optical axis image is offset, 9 mm to the left. Align with the cross line collimator, and finally drive in with a star image.