Believe it or not I’ve had success using a pedestal fan blowing air constantly over my imaging rig all night ( 8” f5 Carbon Newt ) until the early hours.
The fan has to be running before dusk and the fan speed and distance to the rig has to right in order to avoid it affecting my PHD2 guiding.
I used this method a few times last year and it worked contrary to physics.
I do have a Kendrick heater bands wrapped around my guide scope, front and rear of the OTA as a back up too but didn’t need them switched on.
Obviously if dew is ridiculously heavy , I mean really heavy then my method would struggle but light to medium dewy nights no issues.
Cheers
Martin
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