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Its really easy...I just went to my Local foam company and bought a matt black 5ml sheet of closed foam...it was $17 and will be heaps to make 3 shields if wanted......
A dew shield will temporarily slow down the dew process but as you have a Dob...you dont have to worry about the corrector plate like us SCT owners.......The dew shield will help with light polution from next door......it stops some of that unwanted light entering your tube.
Here is a picture of mine I made 2 weeks ago....
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