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Rounding up - conclusions
This set up only achieves the goal of 10 - 12C differential with use of an external TEC - maximum differential is ~19 - 20C, which is suitable for warmer climates.
It may do better with a good quality internal TEC and may just trip the 10 - 12C goal, without an external TEC; however
5D MKII sensor heating, during long exposures, is considerable and almost defeats the capacity of the internal TEC - differential is around 4C at most.
Heating is required in the vicinity of the sensor face. A 5 x 10mm Nichrome anti dew strip could be attached to the plastic sensor frame where the dust reduction mechanism was attached - another project, when I pull it all apart to improve on some design issues, discussed in an earlier post.
So that's it.
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