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Is hot to cold really an issue from a fogging/condensation standpoint?
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As other have said, keeping the lens as close to ambient temp that you'll be shooting is key. If I'm going hot to cold and I am afforded the luxury, I'll leave the whole bag out in the cold for a few hours if I can before I open it up then just unzip it and let it cool further. Same from cold to hot.
Is hot to cold really an issue from a fogging/condensation standpoint?
A cold object high humidity area will produce condensation.
With high outside humidity my glasses can for when leaving a cooled building.
Leave the camera and lenses outside all the time.
No multi-element lens is sealed airtight.
You can produce condensation inside the lens barrel.
THAT can take many hours to work it way out.
While a camera lens may appear to be a solid piece of glass it is anything but.
There are multiple lenses used . Some cemented to each other while some are separated by air gaps and move for zoom and focus.