u/Piggy-boi

I'm looking for a low powered lense warmer that will maintain a minimal internal temperature as efficiently as possible.

I am not an astrophotographer, I just suspect this community will be able to help me.

I will be taking this warmer up 4,000m peaks in the Alps. It will be fitted to a plastic lens instead of metal (thermal insulator, good and bad).

Esencailly,.I just need a warmer that will maintain the lens's internal temperature above the ambient temperature, bear In mind it will be close to my body the entire time. I'm thinking about maintaining 20-30°C would be about right, but I'm unsure. And I'm looking to find something very efficient so I don't need to carry a giant power bank, that will run out.

I also have the strange caveat that it has to be easily removed and attached (as easy as it gets), able to be done 1 handed (with some practice).

Alexander the Great, Emperor Ashoka, Cesar, Genghis Khan, and Augustus are all genocidal maniacs. Not good people. But for some reason people consider them to be great amazing people as if they didn't murder millions.

Not a single one of these people can be considered a "good person" but they are for some reason held in high regard.

I believe that 1,000 years down the line, it isn't unlikely for a certain world leader that went toe to toe against the planet, and almost won to be remembered similarly. Even though they are also just as evil as the others.