I usually bring my Tec 180FL in after a night of viewing. However, the other night so many mosquitoes entered our house while packing up, I decided to leave the scope set up and under a Telegizmos 365 cover. The next night I took the cover off and started viewing. The views were amongst the worst I have ever seen. I think the scope had heated up under the cover and I hadn’t cooled it by removing the cover earlier so you could see the slow swirling heat plumes on out of focus stars.
Tonight I am going to remove the cover as soon as the sun goes down or earlier when shady to cool the scope.
I expected because the scope was outside it would already be acclimated and I was looking forward to just removing the cover to start viewing. But it appears I still have to cool it down by removing the cover early. I wonder if my views will be compromised or the cooling process will be much longer because the scope becomes so warm under the cover. Temperatures drop quite quickly here.
Does anyone have any experience to share? Is there a way to keep the scope from heating up so much. Do you remove the cover a couple hours before viewing to cool the scope? The bottom was not sealed shut but I don’t know if that would help. Perhaps taking the cover off early enough will be fine.
Thanks for any suggestions!