Hi Leon,
I do things similar to you in most of this, but I can never get it to focus spot on with any of my lenses. with a crescent moon or more there is no probs but just on a star or even venus its always out. Maybe the 5d does a better job of it or that my camera has been modded but I always have to tweak the lense closer to the infinity mark after using autofocus on a star..
Go-figure..?
cheers
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