I've heard one or two mentions about focus drift during the eclipse. I'm wondering for those who have shot a prior eclipse how much of an issue it is. I know to have my gear out and acclimated. I'm not sure that much heat will enter the optics with a solar filter in front. Then things perhaps cool again during the full... is there any real issue with cooling during this time?
I'd like to minimize fuss as much as possible around totality, to enjoy it myself, so hoping for a final focus check maybe 30 minutes or more prior and then hands off. Is it worth wrapping my lenses in reflectix or anything? I'll likely have two dslr/lenses on one GEM tracking the whole event, and perhaps an Ha solar scope on another (not worried about totality with that one as it'll be Ha only). Trying to do my overthinking well in advance.