As long as I cool down my camera in advance, looks like I don't need. Setting up my rig for today, after cooIing to -10C, I realized that my ZWO ASI294MC Pro was warm towards the front. A tad less on the heat sink. I image by the side of the pool, in South Texas, so humidity here is a real thing.Still took me some 20 minutes for the freeze smudge to fully disappear. Temperature is about 76-78F outside right now.
These pictures were taken 8 min apart, with a flat frame. Out of curiosity I kept it in place to see if the smudge would disappear.
Not a question, just a curiosity. Yes, I know there's a shadow on the top right. My STC filter does that. Never a serious problem.