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Hi Peter, I tried an alum bar across the bottom but it only had air conection. I also tried a copper finger with metal to metal contact but I was unable to measure any better sensor response with either setup.
I think the sensor temp managed to stay a little lower for longer comapred to earlier attempts but that may have been my optimistic opinion at the time.
You really need to get a camera with sensor temp displayed at EOS to obtain valid results. The big issue I had with cooling a DSLR is that as soon as you start running a series of longer (30 sec eg) exposures the sensor temp rapidly climbs to wthin 5*C of your first measurement. Any darks taken are invalid as the noise values are not consistent.
The little ZWO I can cool down to -2.5 and hold it there for long imaging sessions. I'll keep playing with the DSLR stuff but to get consistent results the real answer is a cold finger mod. I may look into that if I go ahead with the IR cut mod although the ZWO does that already.
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