Hi Marty
I have an SCT and even with a dew shield, the corrector plate will begin to dew over in less than 2 hours on those averagely damp Qld nights.
Therefore, I have a
Kendrick Dew Heater which has a low powered resistor element that wraps around the corrector plate ring and just keeps the plate slightly warmer than the outside air temp, thus preventing the formation of dew on the corrector.
Cheers
Dennis