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I’ve never used a rasa but with the c14 I need to refocus at least every 1hr till midnight, after which it remains fairly stable. I’ve heard people recommend a refocus every 1degree shift, I reckon that’s generous. I always approach focus from same c/clockwise direction and have mirror locks, and tube is 110% insulated now, but still needs fairly regular attention. Refocus are always in the same direction for me (clockwise adjustment, with c/clockwise final approach of course) so not sure how that reflects on tube contraction.
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