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The delta T depends on the heat load and the heat pumping capabilty of the Peltier stack. You are cooling a single chip directly with no real heat load apart from the much higher internal heat generated by CCD's as compared to CMOS. The numbers are as impressive as is the condensation problems.
The only reason these CCD's work at all is their brutal cooling. I would like to see a Canon CMOS at the same conditions and without Bayer filters.
There is more but I can't be bothered.
bert
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