I to think that having spent $3000+ for a scope and not getting a dew heater is kind of, well, stopping short of a complete kit.
These big corrector can start dewing in mintues and once it starts, if you don't know it has started, by the time you realize it, you have enough dew on your corrector that you are faced with the prospect wiping it off, running a hair dryer to blow it off, or calling it a night.
If you live in the north east, coating etching is a real possibility. People do not believe this happens, but I had an Astro-Physics Apo that would make you weep to see what dew did to the coatings.
While dew shields can indeed slow down dew, once again, once it starts, you are in a pickle. The entire value proposition of the dew heater is to prevent the dew so that you never have to make one of these other choices.
I used to simply leave my dew strap on my C14 all the time. I had the power cable run down under the dovetail to the balance point on the dovetail. Is all I had to do was plug it in. No extra steps to take, nothing to loose or store.
Few things are more aggravating than dew starting to form on your corrector. Once it starts, you are stuck with the ramifications. You can wipe it off, but it comes back. You can hair dry it off, but it comes back. If the dew shield is on it and it does dew up, you can pull the dew shield, wipe it down, and put the dew shield back on it, but it is going to come back.
Why would anyone not want to have a 100% solution???
I have had a lot of problems in astronomy that I could not solve, but dew on my SCT corrector? That was easy.
Edited by Eddgie, 18 January 2020 - 05:53 PM.