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I have a full tube GSO dob and have never had a prob with dewing on the primary, so collapsible should be OK if shroud is used. Definately get straps for the finder both EP and objective and for any EPS you are using. on bad nights if you leave an EP in the focuser for 5 minutes it get dewey, so always use straps on these. I have the Kendrick Digifire 7 and the Firefly straps and find them excellent. The controller is very easy to use, the straps well made. Interestly some heaters are not available in Aust, couldn't get 0.965", or Telrad heaters or a heater for my eyepiece box, but got them direct from Kendrick in Canada. Theior service was excellent.
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