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I figure if they gave terrible seeing people wouldn't use them. But I'm wrestling with conflicting concepts here; 1) warm telescope = tube currents = bad. 2) Got dew? = heat telescope! = good!
Obviously, it's a matter of degree (haha, no pun intended). But it makes me wonder what the optimum is. Does a dew heater lead to fewer tube currents or vice versa? I know in practical terms it probably doesn't matter that much but I'm curious as to where the optimum lies.
Markus
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