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Nice detail despite of seeing Troy. Re aperture one must consider portability when going for a scope over 12 inches, I'd say permanent setup is a must for larger SCTs. I tend to take mine to the courtyard and leave it outside when high pressure system is in place, waiting for those perfect conditions.
It's been the usual pattern the last month or so - good seeing lasting 6 minutes at a time, usually going near perfect after 1am for about 15-20 minutes. Then around 3am another period.. and then high level winter fog before dawn.
Seb
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