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Thanks guys. I think at least now I know what gain is :-) I'll give it another try with much less gain.
Fred, it's weird for me too. The camera is bolted to an 2" extention tube as tight as possible. I am using the extender as I can't reach focus without it.
However the extender is still 10mm shorter than needed so to get my camera in focus I insert the extender into focuser with 10mm gap.
It should not cause this bad left bottom corner if all elements of my imaging train are tightened vey well, right?
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