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RE: The Countless Stars of Heaven's Field
It was a second hand lens, I should have returned it to the guy but I kind of didn't use it straight away, so found some info on how to fix decentering in that lens. It was pretty obvious decentering as the stars were elongated even at the lens center.
I guess that's the same principle as collimating a newt?
kind of, I had the lens setup on a tripod in liveview on a bright star while I did adjustments to get the star nice and round. It was a real pain to be honest putting the lens back together!
Still that's great that you were able to fix it yourself. Most people wouldn't even try. :)