Hi again everyone,
Just a simpl question here. Does anyone have a method of keeping dew from forming on a secondary mirror. After about 2 hours mine fogs up and I don`t like sticking the old hair dryer down there as it takes forever for things to settle down. Would some form of heating with resistors work without making thermal currents? I don`t want a dew cover either as thatwould give me vignetting as this is a imaging newt...
Any ideas welcome..
Cheers Gary
