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It was a focus change due to temp changes that I was concerned with when I made the decision to use carbon poles v alloy, Rolf didn't have his new 12.5" f4 going at that point in time.
I'm going to make a new scope at some stage using a 12.5" f3.1 mirror that I have just about completed, I'm thinking about using alloy poles for that so that should be a real acid test for them.
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