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well tonight wasn't a complete waste of time. I did a re-shoot of sirius with mirror cell loosened and vanes de-wonkified and it looks like I have pretty much sorted out the double diffraction spikes. They are still there to a small extent - but much less obvious.
From this I would imagine that the cause was the vanes not being straight / aligned.
EDIT: there is a nasty reflection in there also - would that be off the MPCC??
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