The fogging problem is very rare in DSLR or mirrorless housings, and mainly a problem with the smaller compact housings.
The reason being that there is much more air trapped in the larger housings and the minor humidity that finds its way through is negligible and does not create fog.
Larger housings also don’t usually heat up as much as compacts.
However, it can happen, especially in extreme climates.
One common situation is moving from a cold, air conditioned space to a hot one – in some cases, this can take a long time to acclimatize and you can even fog when you’re underwater!
The trick here is to acclimate your camera to the environmental conditions for way longer than you think is necessary – I prefer to leave my cameras outside on a balcony overnight or similar if possible for this reason.
Another option is using desiccant packets, which can help in the event of small amounts of moisture in your housing.
Placing one of these inside the housing is recommended, just in case you have a minor leak due to a hair in the O-ring:
It will soak up a small amount of water and protect your camera.
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