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Vibrations from fans can definitely cause problems, the fan I added to the rear of my newt was causing blurred images and star elongation.
That said, I think you're definitely onto it here, Alex. I too made a dew shield out of corflute and adhesive felt and I was thinking about modding my newt to add a fan to protect the secondary from dewing. Adding heat to a secondary seems like a terrible idea to me, I'm not sure why so many people do it.
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