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Cooler Box
I tested my cooler box one evening at ambient temp of 15 degrees.
Pre cooled for at least one hour with camera in the box, after 10 exposures @ 5 min. each, ( 55 min) the temp inside the box showed 7 degrees.
When one takes into account a normal temp rise of 13 degrees for an DSLR
I consider that a good result.
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