Dunk, all heat pipes are not created equal, especially for astro camera use. There are three types of heat pipes, all determined by the internal pipe design: grooved internal walls, wicking in the pipes, and sintered pipe walls. Of the three types only sintered perform at all attitudes, the other depend on gravity for flow back. Since an astro camera may assume different attitudes to the ground in use, only the sintered pipes will give consistent cooling results at all attitudes. There is a research paper that I saw on this subject and I think I linked it in to Rowland's thread last year. I will try to locate it again, it's an interesting read. The thing is, not many suppliers mention what kind of heat pipe architecture thry use. Deep Cool do mention that theirs are sintered which is why I went with them on the colour camera. I have no idea what Cool Master pipes use.
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