FYI - experimental sensor condensation control is not very effective as shown in the 5DMKII cooling thread. I'm exploring another method. The heating requirements are adequate, but plastic is not a good conductor. Dew heater needs to be relocated or adhesive aluminium sheet overlaid and in contact with the edges of the filter glass.
5mm on one side of the filter glass is free of condensation. Dew heater competing with cooling, reducing the differential by 4 - 5C - to be expected.
Bah - strip it down and start again.
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