Estimate dew risk from temperature and humidity so you can protect lenses and correctors during tropical night sessions.
Frequently asked questions
What spread means high dew risk?
Risk is high when the air is within 2 °C of its dew point or humidity is 92% or more, and moderate within 4 °C or from 80% humidity. Optics then fog quickly; heaters or dew shields help.
Why is Guyana dew-prone?
Coastal humidity stays high after sunset. Even a clear night can soak a corrector plate without a heater strip.