Ok that's good to know, thanks Martin.
I've already bought the secondary dew heaters so likely going to install them & have to find out this nugget of wisdom myself & I'm sure end up with the same conclusion. That being said, I've got to persist now as I'm already invested.
Guess I'll just try a few things for the Primary, cheapest being attaching a fan in exhaust mode & see how that goes. Would be curious to know how best to do that, such as attach the fan directly to the primary mirror holder vs create a panel and attach it to that, which should also promote better airflow as itll enclose the back, but do any of these create more vibration than another. Failing that, Kendrick warmer, failing that, just don't shoot on dewy nights.
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