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hey andrew, the MPCC has a little ring around it, if its still there GET RID OF IT as it is the biggest useless piece of snot. I have come to realise that the MPCC is actually poorly designed. Works perfectly but the over all design isn't really for photography. I have actually contemplated putting the whole thing into the lathe and milling down the barrel of it so that it might sit in the focuser properly. But then again I will most likely move to a wynne 3" corrector to solve my issues and kill two birds with one stone in preperation for my next steps in astrophotography.
Thats my take on the situation and i echo what has been said that your camera isn't sitting flush with the focuser draw tube because the stars are focusing at a inclined plane. Are you also able to take some close up photos of your focusing unit?
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