Most actual cameras dedicated for astrophotography (the stuff shown in the article is more like a frankenstein improv) have fans. Most of the large dobsonians h

Most actual cameras dedicated for astrophotography (the stuff shown in the article is more like a frankenstein improv) have fans. Most of the large dobsonians have fans. Many high-end SCT telescopes (typically used for astrophotography) also have fans. Fans are good, fans are your friend. They fight all sorts of thermal issues. They're typically fans with high quality bearings that also are spinning slowly. There's essentially zero vibrations coming out of that. It's very hard to get decent results out of any optical stack, especially for photography, without having any sort of fans, heaters, coolers, and other air flow and temperature management devices in various places.