Some time back, a user here (I can’t recall his name, sorry) posted his physics lecture on dew shields and how to best utilize them. The recommendation was that flocking is bad, you should paint the inside of your dew shield and wrap it in insulation.
Well last fall and early winter, I suffered repeated dew problems despite turning my dew heaters way up. I decided to go out on a limb and trust the lecturer. I didn’t understand the math, but I understood the reasoning and have deep respect for those who spend their lives studying the sciences. Again, sorry, I can’t remember the name.
I’ve finally done this with my Askar 120APO. The dew shield unscrews from the telescope body. I removed the flocking and the glue under it. I painted it with Rustoleum 2x Ultra-Matte black spray paint and wrapped it with some insulation from Amazon: Reflectix Reflective Radiant Barrier Insulation Roll.
But now, it feels like I’ve traded one issue for another. I’m concerned about reflections off the dew shield. It looks reflective when you look through it. How do I evaluate whether my dew shield is reflective enough to cause an issue? And did I use the right paint? It doesn’t seem right? I didn’t expect it to be reflective. I thought matte meant “not reflective”.
I don’t know anything about paint.
