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dewpoint
I use a Kendrick premier controller plus temp probes for my RC mirror which allows me to set the heat strap to kick in a certain temp above ambient to avoid the dewpont. I usually only need this for the guidescope however. The RC primary has only dewed up once so far.
Same reason that I have a thermostat controlled water chiller for my STL water cooling system to keep the water at a set temp - if the humidity is high, chilling the water too far (sometimes just a few degrees) below ambient can make it 'rain' inside the camera - not good. Of course you can then add heaters to avoid this.
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