Thanks Dougie seen that one but didn't like the cumbsersome nature of the container.
I'm not talking about drastic temperature differences here a drop of 10 degrees or so on ambient air temp significantly reduces noise created by the CCD.
Condensation occurs when the is a signicant drop especailly sub zero in temperature relevative to ambient air temperature as it will be external to the camera and temperature controlled condensation shouldn't be an issue.
I had thought about copper but sometimes hard to get in small sizes and more expensive and the only scrap metal yard I know that may have had it closed down recently after 60 years in business.
But it's all fun trying
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