[mental4astro (Alexander)]

Thanks for the encouraging comments.

Gary, if you want to use a fan you will need to see how you can accommodate a fan.

One material that has produced poor insulation properties is the aluminized car windshield sun shades. Myself and a couple of my friends have tried it, and Coreflute is superior.

As for which material is "best", it all depends on what you have readily available, what working properties you want from it (if you need to take it off and on, or if the scope is fixed in an obs).

Just don't have the outside of the wrap coloured black. Black cools to a lower temp than ambient at night, working against your insulation properties, and it attracts dew!