Nice job Scott, it's a nice image. The widefield version is very sharp.
I too have my fan running while I image, and have not noticed any vibration at all. At times when the image on the laptop is boiling away I wonder if it's vibration, so I unplug the fan, find that the boiling is due to seeing and possible tube currents (not vibration), so I turn the fan back on.
I'm not sure about the sucking rather than blowing - bird may have some thoughts on that (mine is blowing air from outside onto the back of the mirror).
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