Quote:
Originally Posted by ghsmith45
Tube currents? Maybe a hot area pooling at the top of the tube.
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In a newt? My dewshield is fairly long but.
Quote:
Originally Posted by DavidU
Which scope Marc?
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5" newt so open tube. That was at the end of the night around 3:30am so I'd say the mirror would have been to ambient as it's small piece of glass.