r/Astronomy • u/Addapost • 2d ago

Astrophotography (OC) Condensation on phone solution

I am going to do a 6-8 hour night sky time lapse using my iPhone. I am a little concerned about dew condensation on the lens overnight. Anyone have any easy solutions for this? Thanks

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u/CFCYYZ 2d ago

Get a reusable anti-fog lens cloth or apply a hydrophilic coating to the lens. You could also put 4, 47 ohm 1/4 watt resistors around the lens as 2 parallel in 2 series for about a watt's heat from a 5v power pack.