I have a new-to-me EdgeHD 8 OTA on the way, and one of the first things I plan to do is make an insulation jacket to mitigate the effects of thermal currents. I have a plan to do so, and I wanted to run it by you fine folks to get your feedback. I'd also like to see how others have approached this project before I start buying, cutting, and gluing.
I plan to wrap just the aluminum portion of the OTA in two layers of Reflectix (with glue in between), then add a layer of adhesive felt to the outside (not a fan of the look of bare Reflectix on a scope). I'll need to cut out a portion of the jacket so that I can access the dew heater (the dew heater should go under the jacket, correct?). I'll spray some hydrophobic solution on the felt to repel moisture and all the bad things that come with it. I'll then run some black all-weather duct tape around the perimeter to stop it from fraying/peeling before finally wrapping it around the tube, closing the seam with duct tape and hiding it under the dovetail.
The dew shield will be similarly constructed, except it'll have just 1 layer of Reflectix (is a double layer necessary?) and two layers of felt - one inside and one outside. I don't plan on using the hydrophobic spray on the inside of the dew shield, since I'd rather any dew that forms get absorbed into the felt rather than run down into the corrector. I'll add a 2" strip of velcro to close it up.
- Right now I do not plan to insulate the mirror cell, just the aluminum OTA and corrector plate. Is this a bad idea? I'll admit that my reasoning is mostly superficial, but I think I'd have a hard time wrapping the cell in such a way that it'll be effective, won't look like a mess, and won't be in the way when using the scope. It also seems to me that insulating the mirror cell is less important than insulating the aluminum OTA, but I could be wrong.
- Being an Edge, this scope will have vents that will actively work against my goal of insulating the tube. How should I address this? I could just cut a couple chunks of Reflectix to stick over the vents, but that's ugly and probably not super effective. My thought, having not yet handled the OTA in person, is to remove the vent cover and fit a small piece (or pieces) of Reflectix into the opening such that I can put the cover back on. Is this feasible? Hopefully it's possible to do it in such a way that minimizes the chances of the Reflectix falling into the tube.
Btw, the felt I plan to use is linked here. It's quite inexpensive and not made for outdoor use, but I couldn't find a better product. Hopefully the hydrophobic spray will help protect it. https://smile.amazon...lv_ov_lig_dp_it
Let me know what you think, and show off your projects so I can get a sense of how others have solved this problem!
Edited by rustynpp, 27 June 2019 - 08:32 AM.