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The +/- 3 - 5 arc seconds where two runs with PEC off - but let me check I hadn't goofed imaging scale, cause with PEC on it said 2.1 arc seconds - (I may have had imaging default at 1 vs 0.515 arc seconds per pixel) - I'll check that tonight!
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Ok, thank you.
Maybe you could send your PE and a graphic there :
http://demeautis.christophe.free.fr/ep/pe.htm (skywalker.14141 [at] wanadoo.fr)
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I guess you could consider a AP900 too if the wait isn't too long.
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I haven't a permanent observation place. I'm not sure it's a good choice in this case.