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More information.
When looking up the tube from the back with nothing in the visual back I can see a image in the secondary.
Image1 shows what I can see when the focuser has been fully turned anti-clockwise.
Image2 what is visible when the focuser is fully turned clockwise.
The tube is horizontal.
Image2 clear shows a problem.
Is the problem with the focuser, mirror tilt, collimation?
Any ideas would be helpful.
Thanks
Brendan
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