[Emuhead (Andrew)]

Hi all,

Wondering what the tried and tested approach to prevent dew forming on the primary mirror of a steel tube Newt might be. The fix needs to be good to use whilst imaging.

One option:
Looking at Primary Mirror fan attached, set to exhaust mode to draw air down the tube and out the back. Do you need a cover on the back also to ensure the airflow is as intended?

My concern with a fan is that it might cause vibration which defeats the purpose as we're all about those details. Have also read that the cover itself can also create added vibrations so not sure if it's better with or without that cover.

Another option:
Shell out for a Primary Mirror dew heater pad (from Kendrick for example).

Concern here is cost, sticking something to the back of the primary.

Hairdryer is out too as my neighbours like sleep, and so do i.

What do other imagers use with success?

Thanks,
Andrew