Hyperstar ventilator
thingiverse
This is an uncomplicated system to cool a C11 SCT telescope. A ventilator is installed in the secondary hole and draws out the air from the otherwise sealed SCT tube. On the Celestron Edge C11, the cool air enters through the 2 vents at the back after passing through micron-sized dust filters. When performing hyper star operations, the secondary is removed, and use of this device does not complicate setup. The fan is a 12-volt computer or electronic fan that can be easily repurposed from surplus electronics or purchased online for a few dollars.
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