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G'day Mark, agreed with your comment but is that not with a slightly thicker walled alu tube? Or does the wall thickness not matter too much? I was thinking since the conversion from imperial to metric cant be matched exactly (ie the components available in OZ are usually a little undersized when trying to match whats in the dob book) would it not be wiser go go slightly bigger?
One thing I did not notice before is that Steves mirror is a F4.5, mine being a F5 so that will definitely make a difference.
Cheers
Mike
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