Quote:
Originally Posted by jjjnettie
Another thing to take into account.
Refractors fog up at the drop of the hat. You NEED to have some sort of dew control. Which means spending more $$$ and having more cables and leads draped around your mount.
Reflectors are relatively immune to dew.
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True, but SCT reflectors can be just as bad. Even in winter, where I live, I still get plenty of dew on my corrector plate. Newts are less prone to dew, due to their open construction, but when it's humid that's different entirely. It all really depends on location....if you were living in the Atacama at anytime of the year, you'd be lucky to even crack a sweat, it's that dry!!!
But here in Oz, you really need to have a dew heater for any sort of scope.
I just had an idea.....if you could do it. It'd probably have to be done at the manufacturer's plant, but what would solve the (internal) dew problems of any closed tube scope would be to purge the tube with pure nitrogen or argon gas. It's dry and would help to drive out any moisture that might be in the tubes.
I wouldn't like to try and do it myself.