Hi Brian,MapleRidge wrote: ↑Fri Oct 01, 2021 11:52 pm Hi Magnus...
I'd say that Arne has the lowest sun elevation of anyone I have seen!
I am in Southern Ontario at 44Deg North, so usually a long winter season, but I have used both the pressure and tilt tuned Lunt etalons well below 0C. I think the record low session I have posted were imaged at -26C, though the typical mid morning air temp is in the -5 to -10C. All of my equipment is mounted in an observatory so it does get colder over night, but have not had issues in over a decade of being setup like this.
Keeping yourself comfortable is the challenge
Brian
Thank you, I would love to have a proper observatory. I have to take everything outside so there are multiple short trips through the kitchen door...
Magnus