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Good question, Andy.
Fans have been used with Newts and other reflectors for a long time now. I have not heard of vibration issues, nor have I seen or felt any with my scopes - BUT not to say others have not had this problem. If you are concerned, cheap fans use ball bearings. Better ones are brushless. The smoothest are Maglev fans. The fan does need to be secured appropriately though. You don't see fans being flimsily held in place. The lens shade won't be held in place by Pixie dust or it will fall off. The mass and design of the scope & mount also very effectively attenuates potential fan vibrations. If vibrations come into play, it's a situation of a poor fan or something touching the blades, not that fans are a problem.
Last edited by mental4astro; 12-04-2020 at 09:32 AM.
Reason: more info - thanks Lee.
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