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It's a bit of dew on the glass. This happens if the camera goes down in temperature very quickly from ambient. Moist doesn't help of course but if you can crank the cooling in stages it won't happen. Frost or ice is usually on the sensor and creeps in from the side coming from the peltier. This happens if the sensor surfaces is dirty/contaminated with grease or finger prints, or wet from a previous session to start with.
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