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How hard would it be to direct a stream of cooled air into the cavity of the camera?
If it has been past a cold cell, the humidity would be low so there wouldn't be condensate on the air stream.
a small stream of modulated temperature air across the face of the lens wouldn't be disastrous to the 'view' and the cavity would quickly cool to 20c below ambient.
The air could be returned to the cell for recooling - so the humidity would remain constant.
It could literally be two tiny air tubes attached to the camera and no weight. The cell could be hung onthe tripod!
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