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Gary it looks like you didnt isolate the cold finger at all.
That way you ask for trouble, moisture will stay on uncovered metal and this way also on the chip.
This way it will end up on your components.
It is better to put some tape on top of the cold finger and thin silica gel bags in every part they will fit.
It is best to leave a part of the cold finger outside of the camera bare so the moisture will settle on that part and not in the camera.
You could also spray the circuit boards with a circuit board laquer so moisture doesnt short out anything that easy (that is what i did before the mirror motor burned out), this way i could go to -7C.
The ccd cameras sold have the boards with a layer of laquer on it and the bare parts of the cold finger is used to collect the dew that is still there.
Hope this helps a bit.
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