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My last design was all plastic or insulation exterior with a large metal plate internally to get more surface heat absorption area but no internal fan. I could try that as well but the real issue is to get the cold into the sensor area and DSLR's being designed to protect the innards for the user is not a good candidate for air cooling where it is needed most.
I added a copper finger contact to the Tripod base mount to get some metal to metal path but no measurable effect. I'm tossing up about adding some holes to the DSLR case, turn it into a seive. Might improve matters somewhat and maybe get some copper path options as well.
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