Wow that is interesting Stuart. I am trying to get hold of a Tak adapter to screw into the QSI so that I can get the FF at the correct distance. I think this is the real source of the elongated stars in my images. I had it near perfect for the 40D but cannot seem to strike it with the QSI. Perhaps I should just take it out of the system and not both with it at present? Your thoughts?
Sorry for the divergence on your thread.
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