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I use a 16" truss dob and I will take it to Astrofest tomorrow, It will take all of a couple of minutes to colimate.
Tube scopes have a bit more of a tendancy top get air currents and are heavier.
When you get to the larger scopes truss scopes are the only way to go.
I hope there is a lightbridge scope at Duckadang this week.
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