In shower scenes in films, how do they stop the lens from steaming up?

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In shower scenes in films, how do they stop the lens from steaming up?

In: Chemistry
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Good question. For vehicle use, I use Barbasol shaving cream. I would imagine it is some kind of similar coating applied but unsure. Hope to find out myself now that you’ve posed the query.

As long as the lens has time to acclimate to the temperature of the environment it won’t fog. Fog is condensation and that happens when the surface is cooler than the surrounding air.

Couple ways:

1. Cold water. Yea, sometimes actors are showering under ice cold water. That’s love of art.

2. Cold water but with practical effects. You can use a vaporizer to put things like PG into the air. looks like a steamy shower then but it’s still ice cold and won’t fog up the lens.

3. Coat the lens with a hydrophobic substance. Prevents water from condensing on the lens, at least somewhat.

They could heat the lens and/or direct a flow of warm, dry air over the front element. You wouldn’t want to over do this or you could create unwanted shimmering optical effects, like in a mirage in the desert.