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Originally Posted by Starkler
My next project (after getting the argo working) is a fan for the dob.
No not just a fan stuck to the back of the mirror cell, but a fan mounted to a plywood disc, sealed against the back of the scope with weatherstrip to give airflow around the mirror and up the tube to flush away the boundary layer.
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I've done that, makes a big difference compared to an open back, but I still feel I have the need for a baffle to deflect more air over the mirrors face.
Thanks Bird, you've sold me on the idea, I like mods that give me the best chance of getting the most out of the scopes.