I've definitely run into the long exposure heat issues. In my hemisphere, the central part of the Milky Way is best viewed during the summer. In my local part of the hemisphere, its ridiculously hot at that time. Even 20s exposures will be noisy. I have a smaller pelican case that I've punched a hole in for the lens to sit outside the case, and then rigged a bunch of those reusable freezer packs for coolers inside. Then covid happened, and I now no longer have a car. To this day, I haven't taken it anywhere to test it out. Now, I'm really sad that I just realized how long it's actually been since I've imaged the sky. <wipesAwayTears>
