It's a hard call to make if your trying to get somewhere near ambient. I'd think very carefully about it matt. I have first hand experience of what can happen to your SCT in the presence of high humidity. Fungus fungus everywhere.
I know your trying to get the temp down, but I was given some advice the other day from someone who is in a position to know just about everything there is to know about fungus and scts and his advice was to seal the scope completely with a dust/humidity filter. Unfortunately that would preclude using the Cat cooler.
I know that doesn't help you but it's important info you should be aware of.
A quick question about how you use the cooler. Do you only need to use it at the start of the night or do you need to repeatedly use it to keep bringing the temp down?
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