[Inmykombi (Geoff)]

Thanks for the reply Fred,

The heaters I designed are two at 6 watts each. They can be independantly switched on / off.

Both on at once when dew is heavy, and then one one by itself when not so heavy.
And were designed to fit one inside the end of the LX200 near the corrector, and the other on the outside of the tube near the corrector.

However, when I tried them out for the first time last time I had the scope out all night, the image quality while viewing Saturn was very very poor.

I then turned the heaters off and allowed the corrector temp to drop compared to the tube, and the image was dramatically better just before the dew formed again. : (

I think you have answered my question though with repect to positioning. Thanks.

I will try just one heater next time on its own and see if that makes a difference, and doesnt heat up the corrector too much.
I may also monitor the temp to see that its only 1-2 degrees warmer.