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That's really a beautiful image Martin.
Definitely tilt and probably with the focuser. I had same with my GSO. Shims up a side of the focuser. Just write notes on which side you put the shims and which way it changed the flaring. Yours doesn't look as bad as mine was. It takes a surprisingly lot to get it right. I had to shim mine by about 2mm - it still needs a bit more.
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