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I had a fabric "shower cap" made up that fits over the end of the scope and has a fan mounted centrally. The cap makes sure all of the air goes past the mirror and it also isolates the vibration. I run an 80mm fan flat out all of the time - it has enough airflow to break up tube currents and cool a 12 inch mirror reasonably quickly. As Steve says, it also helps with dew. The difference with the fan on can be quite startling - within a few seconds of switching it on, the image settles down and sharpens quite noticeably.
Last edited by Shiraz; 07-03-2016 at 07:56 AM.
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