"Dew heaters" are already a thing! http://philhart.com/content/dew-heaters-night-sky-photography http://philhart.com/content/dew-heaters-night-sky-photograph..

"Dew heaters" are already a thing! http://philhart.com/content/dew-heaters-night-sky-photography http://philhart.com/content/dew-heaters-night-sky-photograph... https://www.amazon.com/COOWOO-Warmer-Heater-Universal-Telescopes/dp/B01MR2J4NK https://www.amazon.com/COOWOO-Warmer-Heater-Universal-Telesc... From the reddit thread where the photographer posted this, they're planning to get some: https://www.reddit.com/r/photography/comments/81fu6u/the_results_of_placing_a_fisheye_lens_just_over/dv2yu3w/?context=1 https://www.reddit.com/r/photography/comments/81fu6u/the_res...